Search

Search Results

##search.searchResults.foundPlural##

Effects of Temperature on Population Growth and Resting Egg Production of Freshwater Rotifer (Brachionus calyciflorus)

Doan Thi Nhinh, Pham Thi Lam Hong, Truong Dinh Hoai, Kim Van Van

Received: Jun 10, 2020 / Published: Dec 31, 2020
Resting egg production of rotifers provides critical advantages in larviculture of most fish species due to the reduction in the costs of labour and algae production. The study was conducted to investigate the effects of temperature on population growth and resting egg production of a freshwater rotifer, Brachionus calyciflorus, collected in Northern Vietnam. The rotifer was pre-cultured at 27ºC before being transferred to the cultures at 15 and 35ºC while the control was maintained at 27ºC. One-liter beakers filled with 500mL culture medium were used with three replicates for each temperature group. Stock rotifers were inoculated at an initial density of 200 ind ml-1 and fed with concentrated fresh algae. The results indicated that population growth rate (r) of rotifers cultured at 27 and 35ºC were significantly higher than that of rotifers at 15ºC while the highest density was attained from the treatment of 27ºC, at 608.3 ind mL-1, compared to 468.3 and 360.5 ind mL-1 at 35 and 15ºC, respectively. Transferring the cultures from 27 to 35ºC significantly increased the rate of resting egg carrying females with the maximum rate of 31.5% compared to 21.2 and 13.5% of the rotifers at 27 and 15ºC, respectively. The resting egg densities of the cultures at 35ºC were also significantly higher than those at 15 and 27ºC. The resting egg carrying females appeared and increased their rates in concurrence with increases in the population density. The present results are important information for resting egg induction and production of rotifer in larviculture.
Evaluating the Knowledge of Small and Medium Enteprises’ Managers in Presenting the Information on Financial Statements toward International Integration

Phi Thi Diem Hong, Phan Le Trang, Nguyen Thi Hai Binh, Tran Nguyen Thi Yen

Received: Jun 11, 2020 / Published: Mar 05, 2021
In the context of international integration, managers’ knowledge plays an important role as a valuable organizational resource from a strategic perspective and a foundation for competitive advantage in business environment. The aim of this paper was to build assessment model and attest it in the case of Vietnam’s Small Medium Enterprises (SMEs) regarding manager’s knowledge in preparing the information on financial statements. By analyzing current relative standards (including international and national systems) and two basic assessment models (ASK by Bloom et al. (1956) and BKD by Shinseki (1999)), the study developed to identify the assessment criteria of the manager’s knowledge as one main research objective. The research data of 71 SMEs in the sample showed that: (i)The relationship between managers’ background and their understanding about information on their financial statements was a negative linkage; (ii) The number of managers using their financial statements to make a business decision was very low; and (iii) The most important criteria on the financial statement in their views were profits and revenues.
Theoretical and Practical Issues of Research on the Consumption Needs for Safe Foods in Vietnam Using the Willingness to Pay Model

Le Thanh Ha, Nguyen Van Phuong, Do Quang Giam, Tran Quang Trung

Received: Jun 11, 2020 / Published: Mar 05, 2021
Research on consumer needs for safe foods under the willingness to pay (WTP) approach based on consumer behavior has been performed widely and has contributed greatly to the development of safe foods, assisted enterprises’ decision-making processes in improving agricultural and food products, and provided orientation to policymakers in improving public health as well as in fostering sustainable economic growth. Some of the methods used for measuring WTP for safe foods, such as contingent value (CV), choice experiment (CE), and auction experiment (AE), have made significant contributions to the evaluation of consumers’ WTP for food safety. Moreover, the application of these models has helped to estimate the effects of many factors such as demography, consumer habits, continuation of food safety, individual characteristics, promotion, and product attributes, etc., on the WTP for food safety. The trend of safe food consumption in Vietnam has distinct characteristics, some of which come from national cultural identities; therefore, Vietnamese researchers may approach the empirical studies on this issue all over the world in order to find proper methods for studying consumer needs for safe foods in Vietnam.
Vietnamese Tea Exporting and Forecasting to 2030

To-The Nguyen, Nguyen-Anh Tuan, Le Phuong Thao

Received: Jul 03, 2020 / Published: Dec 01, 2020
This study aimed to determine the factors influencing Vietnamese tea export quantities, namely, the internal factors of national tea production, productivity, and cultivated areas, and the external factors of export price and world tea export quantity (excluding Vietnam). We employed a time-series linear model to estimate the magnitude as well as the sign of the aforementioned factors on Vietnam’s tea export quantity and two Box-Cox transformations called a simple back-transformed forecast and a bias-adjustment to forecast the growth rate of the Vietnamese tea export quantity until 2030. The results suggested that except for the total domestic tea production, all the proposed factors significantly affected the Vietnamese tea export quantity. The tea export quantity of other nations around the world had a significantly negative impact on Vietnamese tea that led to Vietnam’s tea exports dropping by 34 tons on average since the other countries exported 1,000 tons of tea. The forecasted outcome suggested an upward trend of Vietnamese tea exports up to 2030. In order to sustainably develop Vietnam’s tea industry, we recommend that the government should take supportive actions such as investing in in-depth tea processing to improve Vietnam’s tea export quality, focusing on post-harvest activities, investing in organic or high-value tea rather than conventional tea, continuing to accumulate land to support the growth of cultivated tea areas, and maintaining high productivity by using hybrid seeds.
Application of the Internet of Things technology (IoT) in Designing an Automatic Water Quality Monitoring System for Aquaculture Ponds

Nguyen Quang Huy, Vu Thi Thu Giang, Le Vu Quan, Ho Vo The Cuong

Received: Apr 12, 2020 / Published: Nov 27, 2020
The current aims to apply the Internet of Things technology (IoT) in designing an automatic system for measuring and monitoring important parameters of aquaculture ponds such as temperature, pH, and dissolved oxygen (DO). The system includes the Arduino Nano main microcontroller (the device that transmits and pushes data to the Raspberry Pi 3 Web server), the DS18B20 temperature sensor module, the pH sensor module V1.1, and the DO Sensor SKU SEN0237. The system is capable of continuously measuring the above parameters of aquaculture ponds. The measurement results are stored and transmitted wirelessly to smart devices such as computers and mobile phones. Farmers can continuously monitor water quality parameters of aquaculture ponds (pH, DO, temperature) through these smart devices. In addition, a warning message will be sent to the farmer's phone when the DO index of the aquaculture pond falls below the prescribed level. The results of the test evaluation also show the high accuracy of the system when compared with the sample measuring device. All relative errors are satisfied less than the limit value of 5%.
Expression of Zinc Finger Protein Zat12 from Arabidopsis thaliana in Escherichia coli

Le Thi Tuyet Cham, Vu Ngoc Thang, Tran Anh Tuan, Vu Thi Thuy Hang

Received: Oct 26, 2018 / Published: Jul 22, 2020
The C2H2 zinc finger protein ZAT12 has been classified as a plant core abiotic stress response gene in the early response to multiple stresses. ZAT12 links the iron deficiency and oxidative stress responses through the direct interaction with/and negative regulation of a central regulator - FIT. For further research on the regulation of the ZAT12 protein in planta, a huge quantity of ZAT12 proteins is required to inject into mice for the generation of ZAT12 antiserum. In this study, the gene encoding the ZAT12 protein from Arabidopsis thaliana was cloned into the expression vector - pETBlue-2 and then overexpressed in E. coli T7. A high expression level was indicated by SDS-PAGE. Immunoblot demonstrated successful expression using a bacterial expression system.
Growth and Physiological Responses of Sugarcane to Drought Stress at an Early Growth Stage

Bui The Khuynh, Vu Ngoc Thang, Vu Dinh Chinh, Pham Thi Thom

Received: May 14, 2020 / Published: May 15, 2020
A pot experiment was conducted in a net house to evaluate the effects of drought stress (a 20-day water withholding treatment from 100-120 days after planting) on the growth and physiology of five sugarcane cultivars. The results showed that water stress at an early stage significantly affected sugarcane growth and physiology. Water stress resulted in reductions in plant height, stalk diameter, and leaf number of sugarcane, in addition to reductions in the photosynthetic pigment content, Fv/Fm, and SPAD (Soil Plant Analysis Development) readings after the 20-day withholding water period (120 DAP), and in stem, root, and leaf fresh weights, and leaf area at 150 DAP. Besides, drought stress led to increases in stomata density and decreases in stomata length. Variation was also found among the cultivars in response to water stress. Significant genotypic differences in stem fresh weight and leaf area under water stress among the cultivars were observed. The highest value of stem fresh weight under stressed conditions was recorded in ROC22 (50.6 g), followed by QĐ159 (46.5g), ROC16 (46.2g), ROC10 (46.1g), and VL06 (44.4g). However, the highest DTI was recorded in ROC16, followed by VL06, ROC10, QĐ93-159, and ROC22, respectively.
Dietary Supplementation with Sesame Seed to Improve Semen Quality of Ho Cocks

Nguyen Thi Xuan, Nguyen Van Duy, Dang Thuy Nhung, Vu Dinh Ton

Received: Feb 21, 2019 / Published: Aug 30, 2019
High levels of polyunsaturated fatty acids in chicken spermatozoa make them susceptible to lipoperoxidation and reduce their fertility. This study was conducted to assess the effect of sesame seed suplementation in the diet on the semen quality of Ho cocks. Eighteen 13-14 month-old cocks were randomly divided into three groups and were assigned to one of the following treatments: 0% SS (control), 5% SS, or 7% sesame seeds per kg of diet for ten consecutive weeks after a two-week adaptation period. Semen characteristics were evaluated once a week. In the 7% sesame seed treatment group, seminal traits including semen ejaculate volume (1.02mL), sperm concentration (3.68 x 109 sperm), and abnormal spermatozoa (10.51% were improved (P <0.05) compared to the control group (0.82mL, 2.81 x 109 sperm, and 11.04% for semen ejaculate volume, sperm concentration, and abnormal spermatozoa, respectively). Supplementation with sesame seeds did not significantly affect sperm motility, mass movement, or semen pH. Our results demonstrate that sesame seed supplementation at 7% successfully improved the ejaculate volume, sperm concentration, and normal spermatozoa percentage of Ho cocks.
Effects of Fertilization Ratios on the Growth of Pinto Peanut (Arachis Pintoi) under Drought Stress Conditions

Vu Duy Hoang, Nguyen Thi Loan, Bui Thi Tam, Tran Thi Thiem

Received: Jan 23, 2019 / Published: Feb 16, 2019
The objectives of this study were to evaluate the effects of different fertilization ratios on the growth of pinto peanut (Arachis pintoi) propagated vegetatively under varying water regimes. The experiment was carried out in a net-house in a completely randomized design with three replicates. The N:P2O5:K2O ratios were applied at six levels: F1 (1:1:1), F2 (1:3:1), F3 (1:1:3), F4 (3:1:1), F5 (3:3:1), and F6 (3:3:3) while soil moisture included three different levels: 30% (W1), 60% (W2), and 100% (W3) field capacity. Water stress conditions were treated from 30-65 days after planting, and then the pots were irrigated to 100% field capacity. The results indicate that drought conditions significantly reduced (P<0.05) the growth of stolons, leaf appearance, number of secondary stolons, and dry matter, while the root/shoot ratio was higher compared to plants under well-watered conditions. There was no significant effect of the fertilization ratios on the number of secondary stolons. Higher-NP and NPK application ratios showed significant influences on the growth of A. pintoi under drought conditions by stimulating stolon lengths and the number of leaves, while the root/shoot ratio was decreased. Higher ratios of single fertilizers (N, P, or K) did not show a consistent effect on the growth of A. pintoi under drought conditions. The results suggest that a higher-NP fertilization ratio stimulates the growth of A. pintoi under both drought and well-irrigated conditions.
Nitrogen-Use Efficiency Evaluation and Genome Survey of Vietnamese Rice Landraces (Oryza sativa L.)

Hanh Thi Thuy Nguyen, Thuy Linh Mai Dinh, Trung Quoc Nguyen, Cuong Van Pham

Received: Oct 19, 2018 / Accepted: Oct 22, 2018 / Published: Oct 22, 2018
The overuse of fertilizers can result in many adverse effects such as decreasing fertilizer use efficiency of plants, wasting resources, increasing farming costs, and polluting our environment. Local rice landraces including indigenous and local rice varieties, may contain considerable genetic diversity that can serve as sources of germplasm for genetic improvements of nutrient use efficiency, yield, resistance to pests and pathogens, and important agronomic traits. Increasing the fertilizer use efficiency of crops by developing new rice varieties is necessary for sustainable agriculture. In this study, six rice varieties, Chiem Tay (CT), Te Tep (TT), Re Bac Ninh (RB), IR24, P6DB, and Khang Dan 18 (KD18), were evaluated for nitrogen use efficiency. Two landraces, P6DB and CT, which showed the lowest and highest values of nitrogen use efficiencies, were selected for a genome survey. Ninety-seven out of the 1051 surveyed markers indicated polymorphisms. These polymorphic markers were distributed along to each of the 12 chromosomes and were either scattered quite evenly on a chromosome or were condensed at particular regions in the physical map. The obtained information on nitrogen use efficiency (NUE) variation and the marker map should be very useful to further identify QTLs/genes involving in NUE as well as other genetic analyses toward the development of sustainable agriculture.
An Integrated Wireless Sensing System for Monitoring Environmental Parameters in Mushroom Houses

Nguyen Kim Dung, Dang Thi Thuy Huyen, Nguyen Van Dieu, Nguyen Thi Bich Thuy

Received: Aug 21, 2018 / Accepted: Aug 21, 2018 / Published: Aug 21, 2018
The paper presents an integrated wireless sensing system for monitoring environmental parameters, including temperature, relative humidity, and light intensity in mushroom houses. The developed system not only collects spatial environmental data but also enables end-users to remotely observe them via smart devices. Assembly of five sensornodes with a wireless sensor network was used to gather data. The results have shown relatively accurate measurements in terms of environmental parameters. The system is low cost, simple and easy to operate by displaying the native language in interface monitoring software. Therefore, the generated system should be applied in monitoring air temperature, humidity, and light intensity in mushroom houses. Additionally, this study has provided good opportunities for Vietnamese farmers to approach the high technology application in agriculture.
Effects of Aloe Vera Gel Coatings on the Postharvest Quality of Honeydew melons (Cucumis melo L.) Stored Under Atmospheric Condition

Nguyen Thi Hanh, Phan Thi Phuong Thao, Nguyen Thi Bich Thuy, Nguyen Thi Thu Nga

Received: Aug 20, 2018 / Accepted: Aug 20, 2018 / Published: Aug 20, 2018
Honeydew melon (Cucumis melo L.) is a highly nutritious fruit, but its climacteric respiration property leads to rapid quality degradation, a short shelf-life, and low marketability. The objective of this study was to evaluate the effects of Aloe vera gel coating on postharvest quality of honeydew melon cv. Ngan Huy under atmospheric conditions. The fresh fruits were completely immersed into Aloe vera gel solutions at different concentrations of 30%, 40%, 50%, 60%, and 70% at room temperature for 5 minutes. Tween 80 0.05%, CMC 1%, and glycerol 2% were added in the coating solutions. Thirty-six fruits were used in each treatment. The weight loss, firmness, respiration, and ethylene production rates, total soluble solids (TSS) and vitamin C content, and the rate of fruit spoilage were measured during storage to determine the efficacy of the Aloe vera gel in maintaining the postharvest quality of the honeydew melon fruits and protecting them from deterioration. Uncoated fruits exhibited significantly greater changes (P<0.05) in weight loss, firmness, respiration, ethylene production rates, TSS, and vitamin C content compared to coated fruits. Fruits coated with 60% or 70% Aloe vera gel exhibited the smallest changes (P<0.05) in all the tested parameters. Based on the changes of the overall quality characteristics, application of an edible coating with 60% or 70% of Aloe vera gel were considered to be the most suitable practice to maintain the quality of honeydew melon.
Development of a Key Performance Indicators System in Urban Planning by Utilizing the Logic Model

Quyen Thi Lan Phuong, Kakuya Matsushima

Received: Aug 20, 2018 / Accepted: Aug 20, 2018 / Published: Aug 20, 2018
This study proposes the methodology and process to develop a Key Performance Indicators (KPIs) system in urban planning by utilizing the logic model. Firstly, the study introduces the role of KPIs in urban planning for measuring the performance of the whole planning process, and the logic model as a powerful tool for selecting KPIs, as well as the ability to apply it in urban planning issues. Secondly, methodologies are given, including: building a KPIs system from the logic model’s components, data collection for KPIs, and data analysis. Thirdly, the case of the Hanoi master plan is presented, to investigate how the logic model works for KPIs development. The process of the logic model application includes: identification of planning policies; zoning Hanoi for the simulation of the policies’ effects; utilizing the logic model for selecting KPIs; analysis of logical linkage between the logic model’s components; and Hanoi urban data availability for KPIs.
Circular Agriculture: A General Review of Theories, Practices, and Policy Recommendations

Do Kim Chung, Luu Van Duy, Le Thi Thanh Loan

Received: Jan 18, 2024 / Published: Jun 28, 2024
The conventional agricultural sector is threatened by several factors that cause unsustainable development and serious environmental damage. Circular agriculture is regarded as an essential means and is being adopted globally by many countries. Through a narrative literature review, this article aims to discuss the concepts, theories, and practices of circular agriculture, and to draw recommendations for successful implementation. The findings reveal that circular agriculture focuses on promoting resource circularity in the agro-food value chain, minimizing external inputs, reducing resource requirements, regenerating bio-ecosystems, and reducing environmental impacts to meet increasing food demands and improve producers' livelihoods. Circular agriculture differs from conventional agriculture in terms of its principles, levels of circularity, evaluation criteria, and practices. Circular agriculture practices have been adopted globally due to their economic, social, and environmental benefits. However, circular agriculture still encounters obstacles to widespread adoption, such as vested interests and existing policies. Thus, a comprehensive strategy for circular agriculture development should include rethinking and repurposing the sector development strategy; enhancing changes in producer and consumer awareness and behaviors regarding circular agriculture and organic products; increasing investments in circular technology research and development; providing more incentives for producers to access credit and extension services, produce organic products, and to reuse and recycle agricultural resources; and strengthen farmers' organizations to adopt circular farming technologies.
A New Score Function of IFSs and its Application in the Evaluation of Software Quality

Ngoc Minh Chau, Nguyen Xuan Thao, Nguyen Thi Thao

Received: Aug 07, 2023 / Accepted: Jul 30, 2024 / Published: Jun 28, 2024
The score function is used to compare intutionistic fuzzy numbers. In this paper, a novel score function of intuitionistic fuzzy sets (IFSs) is investigated. The novel score function was constructed by combining the polynomial and exponential functions working on the degree of membership and degree of non-membership of intuitionistic fuzzy sets. Then, the newly obtained measure overcomes the limitations of some existing score functions. Next, we applied the new measure to construct a method to deal with a multi-criteria decision-making (MCDM) problem. Finally, this MCDM model was used to assess the quality of software projects. The results showed that the new measure was well done and better than other score functions in some cases. This demonstrate the effectiveness of the newly proposed method.
Integration of Mineral Fertilizer with Organic Fertilizer for Improved Tomato Fruit Yield and Quality

Nguyen Thi Loan, Nguyen Ngoc Hung, Tran Thi Thiem, Thieu Thi Phong Thu

Received: May 15, 2023 / Accepted: Jun 12, 2024 / Published: Jun 28, 2024
This study aimed to evaluate the effects of chemical and organic fertilizers in different fertilization regimes on vegetative growth, fruit yield, and fruit quality of tomatoes. The experiment was arranged in a randomized complete block design with three replications in the winter season of 2021. The treatments were: no fertilizers, application of NPK fertilizer (15-15-15) at a rate of 1000 kg ha-1, application of chicken manure at a rate of 12 tons ha-1, and three treatments of the combination of NPK fertilizer and chicken manure at the ratios of 70:30, 50:50, and 30:70, respectively. The results indicated that the combination of chemical and organic fertilizers led to improved vegetative plant growth. Combining 70% of NPK fertilizer with 30% of chicken manure gave the maximum fruit yield component values and fruit yield of tomatoes. Adding chicken manure to the fertilization regimes also led to better fruit quality. The integrated fertilization increased the TSS and vitamin C values, and when 50-70% of the chemical fertilizers were substituted with chicken manure, the sugar content and total acid increased in the fruits. The color at the red stage was more intense in tomato fruits treated with the NPK fertilizer and integrated fertilization regimes compared to those from organic fertilization.
Evaluation of Electricity Generation from Wastewater by Microbial Fuel Cell

Vo Huu Cong, Tran Duc Vien, Ho Thi Thuy Hang

Received: Apr 27, 2023 / Published: Dec 29, 2023
Combined systems for wastewater treatment and resource recovery have been developed in many countries. However, systems for energy generation are still underdeveloped. This research was conducted to evaluate the possibility of electric potential generation from wastewater using a microbial fuel cell system (MFC). The simple two-chamber apparatus (2 liters) was fed with wastewater collected from dormitory discharge. Three batch experiments were carried out with 2 liters of wastewater with an influent concentration of 518 mg L-1 BOD5 and 750 mg L-1 COD. The results showed that the microbial fuel cell system generated a potential from 0.29 to 0.45 V for 7 days in the presence of 1.0-1.5% (v/v) Bacillus subtilis while this potential was not obtained in the case when microbes were not added. The highest removal efficiencies of BOD5 and COD reached 56% and 63%, respectively. It was found that the potential dropped to almost zero in all of the treatments while the ratio of BOD:COD was 0.83 and the concentration of BOD was around 230 mg L-1, indicating that other governing factors may have an impact on potential electricity generation. Therefore, further studies on the effects of the operating conditions and equipment should be comprehensively studied.
The Dispersion of Total Suspended Solids in Seawater Following Submersion of Dredged Material in the Vung Ang Port

Nguyen Thi Hong Ngoc, Tran Anh Quan

Received: Feb 27, 2023 / Published: Dec 29, 2023
Dredging plays a crucial role in port management, but disposing dredged material in the ocean raises environmental concerns. In recent years, this practice has become more prevalent in Vietnam. This study examined the dispersion of total suspended solids (TSS) in seawater from the submersion of dredged material in Vung Ang Port, northern Vietnam, to evaluate the environmental impact. The study utilized MIKE modeling to simulate the dispersion of TSS during the 16 weeks following the submersion of dredged material into the sea. The model was validated with observed data and adjusted to accurately reproduce wave, water flow, and water level fields. The simulation showed that the propagation of TSS had a significant impact within a radius of 16-17km from the submersion location, with the most severe impact occurring within a radius of 2-3km. The TSS concentration is expected to exceed allowable limits, peaking after 4-5 weeks. Seawater occupation will reach maximums of 49.05ha and 140.66ha for depth increases above 0.5m and 0.1m. The submersion will negatively impact the environment. It is essential to regularly monitor TSS in affected areas during and after dredging to evaluate long-term effects and mitigation effectiveness. The significance of conducting additional research on the matter and the crucial insights offered by this study to pertinent management agencies for their decision-making processes are emphasized in the article. The study offers crucial insights for pertinent management agencies.
Azolla Fertilizer as an Alternative Organic Nitrogen Source for Malabar Spinach Production

Vu Duy Hoang, Nguyen Thi Thu Hien, Tran Van Quang

Received: Dec 05, 2022 / Published: Sep 29, 2023
The spread of organic farming has led to the need for identifying alternative sources of high-quality organic fertilizer. Azolla is a genus of floating aquatic ferns which has high nitrogen and organic matter content due to its fast growth and symbiotic relationship with nitrogen-fixing bacteria (Anabaena-azollae). However, little research has been done on the use of Azolla as an organic fertilizer for vegetable production. The study evaluated the effects of different levels of Azolla fertilizer on the growth and yield of Malabar spinach (Basella alba). The experiment included 6 treatments: Without application – as a control (T1); 1 ton ha-1 soybean meal (T2); 16 tons ha-1 cow manure (T3); 12 tons ha-1 Azolla fertilizer (T4); 16 tons ha-1 Azolla fertilizer (T5); and 20 tons ha-1 Azolla fertilizer (T6). The results showed that the application of Azolla fertilizer significantly increased shoot length, number of leaves, leaf size, dry matter, leaf area index (LAI), and SPAD of Malabar spinach compared to the control or cow manure. The application of Azolla fertilizer at the rates of 12, 16, and 20 tons ha-1 significantly increased the yield of Malabar spinach by 150, 192, and 205%, respectively, compared to the control; and by 37, 60, and 67%, respectively, compared to the cow manure treatment. Yields and parameters of harvested vegetables were the highest in treatments with 16 to 20 tons ha-1 Azolla fertilizer. The results suggest that Azolla fertilizer can be used as an alternative organic nitrogen source in organic vegetable production.
The Impact of Capital Investments on Firm Financial Performance – Empirical Evidence from the Listed Food and Agriculture Companies in Vietnam

Dang Thi Hai Yen, Nguyen Thi Huong, Dao Thi Hoang Anh

Received: May 11, 2022 / Published: Mar 29, 2023
Capital investment is one of the most important financial decisions of a firm, which effects the business survival. This paper investigates the impact of capital investments on firm performance to provide an insight for future capital investment decisions of companies. The study uses unbalance panel data gathered from 62 companies which covered 688 observations of listed food and agriculture sector in Vietnam stock exchange during the period 2009 – 2020. To control for unobserved individual effects, the random effect estimator was employed. Profit margin (PM) is used as a proxy for firm performance, while independent variables are capital investment rate in both short-term and long-term effect, equity to total assets ratio, firm size and tangible to fixed assets ratio. The results indicate that capital investments have statistically significant positive impact on long-term performance of the analyzed enterprises. This outcome is in accordant with many previous studies. Especially in the context of Vietnam listed food and agriculture companies have high level of capital investment, a portion increase in capital investment rate will increase the company profit margin. Other variables also have statistically significant relationship with profit margin, in details, equity ratio and size have positive effect while tangible assets ratio has negative effect on firm performance. Therefore, the research suggest firm managers should choose the appropriate capital investment strategies in long-term perspective, within the consideration of equity ratio, economics of scale and tangible assets investment ratio to get the most efficient performance.
Association between the MUC4 g.243A>G Polymorphism and Production Performance of Landrace and Yorkshire Pigs in Vietnam

Do Duc Luc, Nguyen Hoang Thinh, Ha Xuan Bo, Do Thi Phuong, Phan Thi Tuoi, Vu Dinh Ton, Farnir Frederic

Received: Apr 12, 2022 / Published: Mar 29, 2023
Porcine mucin 4 (MUC4) is a candidate gene for controlling the adhesion of the enterotoxigenic Escherichia coli (ETEC) F4 receptor. Polymorphisms of the MUC4 gene have been used as markers to identify the susceptibility of neonatal diarrhea in piglets for breeding selection. The objective of this study was to evaluate the effects of MUC4 g.243A>G polymorphisms on the production traits of Landrace and Yorkshire pigs in Vietnam. A total of 1,057 Landrace and 1,361 Yorkshire piglets were used to estimate the allelic and genotypic frequencies of the polymorphisms. Body weights at birth, at weaning, at initial fattening (IBW), and at the end of fattening period (FBW), backfat thickness (BFT), and depth of the longissimus dorsi muscle (DLD) were measured and lean meat percentage was estimated. Frequency of the susceptibility allele A to ETEC was higher than the resistance allele G for both breeds based on genotyping piglet tails collected at birth. The AA, AG, and GG genotypes were present in Yorkshire while GG was not found in Landrace. The production traits were not affected (P >0.05) by MUC4 polymorphisms except BFT and DLD (P <0.05). There were interactions between gender and MUC4 genotype (P <0.05) for IBW, FBW, average daily gain, and DLD. These traits of GG males were significantly higher than those of GG females (P <0.05). The results suggest that selecting pigs carrying the GG genotype of MUC4, known as providing resistance to ETEC, do not negatively affect productive performance in Landrace and Yorkshire pigs.
Additive and Dominance Effects of MC4R and PIT1 Polymorphisms on Production and Carcass Traits in Duroc Pigs

Ha Xuan Bo, Nguyen Van Hung, Nguyen Xuan Manh, Nguyen Thi Vinh, Do Duc Luc

Received: Apr 13, 2022 / Published: Dec 30, 2022
This study aimed to estimate the allelic and genotypic frequencies of single nucleotide polymorphisms (SNPs) of MC4R (melanocortin-4-receptor gene) and PIT1 (pituitary specific transcription factor-1) genes, and their additive dominance genetic effects on production and carcass traits in Duroc pigs. A total of 2170 tail tissue samples (1728 gilts and 442 male pigs) were collected from Dabaco Nucleus Breeding Pig Company, Bac Ninh province, Vietnam from January 2017 to June 2020. Polymorphisms in the MC4R and PIT1 genes were detected using the PCR-RFLP method. For MC4R, the frequencies of alleles A and G were 0.430 and 0.570, respectively. For PIT1, the frequencies of alleles A and B were 0.460 and 0.540, respectively. The genotype frequency distribution of the MC4R gene was in Hardy-Weinberg equilibrium (P = 0.375), but the genotype frequency distribution of PIT1 (P <0.001) was not. The MC4R and PIT1 polymorphisms were significantly associated with final body weight and average daily gain (P <0.001). Significant additive effects were also found (P <0.05) for the two traits. The selection of individuals with the MC4R genotype AA and PIT1 genotype AA could improve final body weight and average daily gain in Duroc pigs.
Marketing Channels of Freshwater Aquaculture Fish in the Red River Delta of Vietnam: A Case Study in Hai Duong Province

Huong Van Nguyen, Nguyen Huu Nhuan, Lebailly Philippe, Tran The Cuong

Received: Feb 27, 2021 / Published: Sep 30, 2022
Freshwater aquaculture has played key roles in the livelihood development of farm households in the Red River Delta through freshwater fish ponds, rice-and-fish, and marine cage culture. A market-driven approach is being addressed more and more in promoting new production. This study aimed to analyze the marketing channels of freshwater aquaculture fish in Hai Duong province. The study was conducted with 151 farm households belonging to three fish production system: Fish system engaging fish production only (FS); animal fish system combining animal and fish production (AF) ; and new garden-pond-animal house system (VAC) in the province. The attained results reveal that fish farmers diversified their marketing strategies to obtain a marketing margin of about 87% of the retail price of the finfish along with their value distribution while the remaining portion of the marketing margins belonged to the intermediary market actors. The cost of the purchased fish commodities accounts for the majority of the total cost for all actors. The cost of dead fish presented the highest proportion of the total marketing cost. A large portion of the marketing costs represented wages, fuel, and the rent of a business place. The marketing margin for the intermediary stakeholders in both the studied channels was 12.7%, in which marketing costs accounted for approximately 5.0%. The results will be used for designing better promotion strategies for freshwater fish production and providing good lessons for small-scale fresh aquaculture development towards livelihood diversification and development in rural areas.
Lecturers’ Subjective Well-being: A case study

Tran Thi Thanh Tam, Nguyen Thi Thanh Hien, Nguyen Thi Hoai

Received: Oct 02, 2020 / Published: Dec 31, 2021
The aim of this study was to show the level of lecturers’ subjective well-being at Vietnam National University of Agriculture and the differences in their subjective well-being levels according to the variables of gender, education, income, and teaching experience. The study used the Oxford Happiness Questionnaire (OHQ) designed by Hills and Argyle (2002). The questionnaire included 29 items and has been widely used as a scale for the assessment of personal subjective well-being. The results showed that most lecturers at Vietnam National University of Agriculture were quite happy. There were significant differences in the level of subjective well-being according to some variables investigated.
Preliminary N2O Emissions of Major Vegetable Cropping Systems in Peri-urban Hanoi, Vietnam

Nguyen Phi Hung, Ampt Peter, Rogers Gordon, Ly Thi Thu Ha

Received: Sep 03, 2020 / Published: Dec 31, 2021
Crop management practices in intensive vegetable production can influence nitrous oxide (N2O) emissions from soils. This study quantified seasonal N2O emissions and N2O emission intensities, and investigated the factors driving emissions in different vegetable management practices. Emissions from four typical vegetable crops (two choy sums, a mustard, and a cabbage) were intensively measured over the 2016 autumn season on farms in Van Noi and Dang Xa communes in the Hanoi peri-urban area. Different N2O emissions were observed in the four leafy vegetable crops. The average daily emissions varied from 12.15 g to 40.08 g N2O-N ha-1 and the autumn season N2O emissions varied from 1.13 kg to 8.45 kg N2O-N ha-1 across the four crops. The greatest daily and season emissions were from cabbage, and the lowest were from mustard. Emission intensities varied among the types of vegetables and was the lowest at the mustard farm (37 kg CO2-e t-1), indicating that the crop management practices increased the mustard yield but retained a low N2O emission rate. Practices responsible for high N2O emissions were overuse of nitrogen fertilisers and furrow irrigation. An improvement in the farmers’ adoption of best practices in fertiliser application and irrigation could reduce N2O emissions without affecting crop productivity.

76 - 100 of 170 items << < 1 2 3 4 5 6 7 > >>

Search

Advanced filters

Search Results