Hue University Journal of Science: Agriculture and Rural Development

Characteristics and antibiotic sensitivity of Streptococcus iniae isolated from sturgeon (Acipenser baerii)

2026-04-07T07:34:04+07:00

This study aimed to identify and evaluate the antibiotic susceptibility of the bacterial pathogen causing hemorrhagic disease in cultured sturgeon (Acipenser baerii) at the nursing stage in A Luoi, Hue city. Bacterial isolates were characterized using biochemical tests (API 20 Strep) and species-specific PCR The results that all isolates were Streptococcus iniae, showing typical characteristics including Gram-positive cocci, negative oxidase and catalase reactions, and hemolytic activity. PCR amplification yielded a specific product of approximately 870bp. Antibiotic susceptibility testing using the disk diffusion method demonstrated that S. iniae isolated from 12 sturgeon disease samples exhibited high sensitive to most tested antibiotics, with inhibition zone diameters ranging from 16,0 to 38,0 mm. The greatest antibacterial activity was observed for Cephalexin (30 µg) and Amoxicillin (10 µg), which produced inhibition zone of 38.0 and 36.0 mm, respectively.

Prevalence of Salmonella spp. in smallholder chicken farms in Hue City

2026-01-21T01:57:23+07:00

This study aimedto determine the prevalence and risk factors associated with the presence of Salmonella spp. in smallholder chicken production under semi-commercial and traditional systems in Hue City. A total of 620 samples were collected from 93 farms located in Phong Dien, Quang Dien, and Phu Vang commune., including cloacal swabs, drinking water, litter, dust, feed, and internal organs. Isolation was performed following the Vietnamese Standard TCVN 10780-1:2017. The isolates were identified using biochemical tests and PCR targeting the invA gene (244 bp). The results showed that 33.71% of samples were positive for Salmonella spp., with the highest detection rate observed in internal organs (58.82%), followed by litter (45.83%) and cloacal swabs (42.23%). Several factors increased the risk of Salmonella infection in chickens in Hue City, including the use of bio-litter bedding (OR=2.96; 95%CI=1.56–5.63; p=0.002), absence of routine disinfection (OR=1.80; 95%CI=1.09–3.21; p=0.0001), wooden or bamboo housing (OR=3.10; 95%CI=1.55–6.36; p=0.002), and lack of technical training among farmers (OR=2.28; 95%CI=1.27–3.88; p=0.0001). All isolated strains were positive for the invA gene, indicating the widespread virulence potential of Salmonella spp. These findings suggest that Salmonella spp. remains a significant hazard in smallholder chicken production systems; therefore, strengthening biosecurity and improving farmer awareness are essential to reduce the circulation of the pathogen.

Non-farm livelihoods and factors influencing participation of rural households in the mountainous areas of Hue city

2026-04-07T07:37:05+07:00

This study analyzed livelihood activities and the factors influencing the participation of rural households in non-farm activities in the mountainous areas of Hue City. Data were collected from a survey of 146 households in two representative communes. The results showed that most households still rely on agroforestry, however, a growing trend toward livelihood diversification through engagement in non-farm activities was observed. Notably, households combining agroforestry with non-farm activities achieved the highest income levels (119.5 million VND per year), which were nearly four times higher than those relying solely on agroforestry, highlighting the important role of non-farm livelihoods in improving household income. The Logit model indicated that four factors were statistically significant, including household head ethnicity, educational attainment, number of working-age household members, and distance to the market. Based on these findings, it was recommended that vocational training aligned with market demand be strengthened and high–value-added non-farm livelihood activities be promoted through technical support, microcredit, and improved market linkages to enhance income for mountainous rural households.

Assessment of changes in agricultural land use in Tan An area, Tay Ninh province in the period of 2010-2024

2026-03-05T02:55:57+07:00

The study focuses on assessing changes in agricultural land use in the Tan An area in the period of 2010-2024 on the basis of maps of current land use in 2010, 2015, 2020 and 2024, combined with statistics and land inventory processed by GIS technology. The datasets were standardized to a common coordinate reference system, harmonized under a unified land-use classification scheme, and compiled into a spatial database comprising the major agricultural land categories, including paddy land (LUC), annual cropland (HNK/BHK), perennial cropland (CLN), aquaculture land (NTS), and other agricultural land (NKH). Overlay analysis and transition matrix methods were employed to identify the magnitude of area change, conversion trajectories, and spatial distribution characteristics of these land categories. The results show that agricultural land decreased from 4,870.14 ha in 2010 to 3,809.35 ha in 2024, representing a loss of 1,060.79 ha. The most prominent change was the conversion between paddy land and perennial cropland: during 2015-2020, the dominant trend was conversion from paddy land to perennial cropland, whereas during 2020-2024, a reverse conversion trend emerged. A comparison between the 2024 land-use status and the 2030 land-use planning map indicates that the agricultural land reserve under the planning scenario is expected to remain at approximately 568.21 ha, providing a useful reference basis for land-use management and planning review.

Current status of issuing certificates of land use right and assets attached to land for economic organizations: A case study in communes of the former Hoa Vang District, Da Nang City

2026-04-16T17:18:05+07:00

This study was conducted in communes of the former Hoa Vang district, Da Nang City to assess the current status of issuing certificate of land use right and assets attached to land for economic organizations during the period 2015–2024. Data were collected through document review and questionnaire-based interviews with 61 economic organizations that were granted land use right certificates in order to analyze the impacts of this process on socio-economic development. The results indicate that a total of 1,844 land use right certificates were issued to 61 economic organizations, covering a total area of 566.86 hectares for various land use purposes, including residential land, commercial and service land, land for non-agricultural production facilities, and land for industrial parks and clusters. In comparison, residential land accounted for the largest number of issued certificates, primarily associated with eco-urban development projects, while commercial and service land represented the largest allocated area, mainly concentrated in large-scale tourism projects. Overall, the issuance of land use right certificates has had a positive impact on socio-economic development indicators by ensuring secure and stable land tenure, promoting investment, expanding production activities, creating employment opportunities, and enhancing overall development efficiency.

Evaluation on growth, development and yield of new promising short-term rice lines/varieties for processing in Gia Lai province

2026-03-25T09:15:32+07:00

Rice is an important food crop, occupying a high percentage of the cultivated area in the South Central Coastal provinces. Currently, the demand for processed rice varieties to export is increasing, but there is a shortage of these new rice varieties in the practice for domestic production. Therefore, this study aimed to select short-duration rice lines with high yield and amylose content for processing. The experiment was conducted in the Summer-Autumn 2025 season in Gia Lai province on 7 rice lines originating from the Agricultural Science Institute for Southern Coastal Central Vietnam and a control rice variety, arranged in a completely randomized block design with 3 replications. The research results showed that the growth duration of rice lines was in short duration group (94-105 days), suitable for the cropping system in Gia Lai province. All rice lines had agro-biological characteristics such as concentrated flowering time, high field purity, complete panicle emergence, strong stems, and less pests and diseases damages. The highest grain yields were achieved in lines P464 (72.05 quintals/ha) and P620 (74.10 quintals/ha). Quality indicators (amylose content, protein, starch, gelatinization temperature, gel durability, grain quality were high, with amylose content exceeding 25% in all experimental lines. Lines P464 and P620 have short duration, high yields, and high amylose contents, therefore, they are recommended for further evaluation in the next season to serve future breeding purposes.

Factors influencing the growth rate of lactic acid bacteria isolated from fermented pork “nem chua”

2026-04-07T09:45:39+07:00

Lactic acid bacteria (LAB) play an important role in the food industry and is also a potential candidate for the production of probiotic products in aquaculture. Therefore, this study was conducted to determine the factors influencing the growth rate of lactic acid bacteria strains, NC3 and NC7, isolated from fermented pork “nem chua”. The effects of pH (6.0, 7.5, and 8.5), salinity (10‰, 20‰, and 30‰), and temperature (28°C, 33°C, and 38°C) on the growth of LAB strains were investigated. The results showed that both NC3 and NC7 exhibited good growth under the experimental conditions, with maximal growth observed at pH= 6.0, salinity of 10‰, and a temperature of 38°C, with an initial inoculum concentration of 2x10⁶CFU/mL. Both bacterial strains NC3 and NC7 were identified as Lactobacillus fermentum by MALDI-TOF MS.

Study on the efficacy of an inactivated Vibrio alginolyticus vaccine in preventing hemorrhagic disease in red drum (Sciaenops ocellatus)

2026-04-30T16:26:51+07:00

This study evaluated the efficacy of an inactivated whole-cell vaccine of Vibrio alginolyticus in preventing hemorrhagic disease in red drum (Sciaenops ocellatus). The V. alginolyticus strain (VA15) was selected from 20 isolates obtained from hemorrhagic diseased cage-cultured fish in coastal areas of Hue City, Vietnam, and was subsequently used for both vaccine preparation and challenge testing in red drum. The vaccine was prepared by formalin inactivation and administered via feed to assess its safety and protective efficacy in experimental fish. The results showed that the vaccine had no adverse effects on growth performance, feed conversion ratio, behavior, or the histological structure of the intestine and liver. Vaccinated fish exhibited enhanced immune responses, with significantly higher antibody titers than those of the control group. Following bacterial challenge, the relative percent survival (RPS) reached 44.2% in the single-dose group and increased to 53.5% in the booster group at a concentration of 10⁶ CFU eq/mL. These findings indicate that the inactivated whole-cell V. alginolyticus vaccine has potential as a safe and effective strategy for preventing hemorrhagic disease in red drum aquaculture.

Developing a commune-level climate risk assessment index: An approach based on the IPCC framework and the Fuzzy Delphi Method

2026-05-06T17:42:56+07:00

As defined by the IPCC, climate risk results from the interaction between hazards, exposure, and vulnerability, causing negative impacts on sustainable development in rural regions. However, assessments at the commune level are still constrained by the lack of scientifically grounded and systematically selected quantitative indicators. This study aims to develop and refine a set of commune-level climate risk indicators through expert consultation using the Fuzzy Delphi method. An initial set of 50 indicators was established based on theoretical frameworks and practical considerations. Through consultation with 31 experts, 45 indicators were retained according to predefined consensus criteria. The results show that the Fuzzy Delphi method is effective in addressing uncertainty in expert judgments and improving the reliability of indicator selection. The proposed indicator set provides a scientific foundation for assessing climate risk at the commune level and offers practical support for rural development planning and climate change adaptation.