The Journal of Agriculture and Development

●The Journal of Agriculture and Development (JAD) is a peer reviewed journal publishing novel and significant research in a wide range of topics such as Agribusiness and Economics, Agricultural Mechanics, Agronomy and Forestry Sciences, Animal Sciences, Aquaculture and Fisheries, Biotechnology, Environmental and Natural Resources, Food Science and Technology, and Veterinary Medicine. The JAD is an open access journal that includes primary research, review articles, short communications, and special invited papers. We also publish special issues which focus on the current emerging topics in agricultural sciences.

●The JAD (the formerly named Journal of Agricultural Science and Technology) is published in 6 issues per year (4 issues in Vietnamese with English abstracts and 2 issues in English). The journal has published over 19 volumes since 2002. From 06/2018, the Journal started to publish online issues in two languages (English and Vietnamese).

●Period of publication: Issue 1 (FEB), Issue 2 (APR), Issue 3 (JUN, English), Issue 4 (AUG), Issue 5 (OCT), Issue 6 (DEC, English)

●The Journal's number of articles per issue ranges from 6 to 12.

●Publisher: Nong Lam University, HCMC (NLU)

Effects of 6-benziladenine, thidiazuron, and 1-naphthaleneacetic acid on the in vitro callus formation and shoot multiplication from leaves of Mai vang (Ochna integerrima) HD01 line

Kiet C. Nguyen, Duy M. Pham, Van H. Phan, Tri M. Bui, & Hau T. Le
Electronic version: 23 Dec 2024 | DOI: 10.52997/jad.6.01.2024
Abstract | PDF (2.1M)

Abstract

Mai vang (Ochna integerrima (Lour.) Merr.) not only is a popular ornamental plant but also possesses numerous valuable herbal properties. An exceptional line, the HD01, was bred by adept florists at the Binh Loi Mai village, Ho Chi Minh City. The objective of this research was to determine the optimal 6-benziladenine (BA), thidiazuron (TDZ) and 1-naphthaleneacetic acid (NAA) concentrations appropriate for callus formation from leaf samples and regeneration of shoots from callus of the HD01 cultivar in in vitro condition. The study including two experiments was arranged in a completely randomized design with one factor and two factors, respectively. For callus induction, the culture medium supplemented with concentrations of TDZ combined with concentrations of NAA was used, while to induce shoots, concentrations of BA combined with concentrations of NAA were added to the medium. The results indicated that 0.2 mg/L TDZ combined with 0.25 mg/L NAA on the base of MS (Murashige and Skoog) medium supplemented with 7 g/L agar and 30 g/L sugar gave 100% callus formation rate after 17.6 days, with the largest callus diameter (2.7 cm) and highest callus mass (2.4 g) after 60 days of culture. The leaf-derived callus produced the best results when cultured on MS medium supplemented with 7 g/L agar, 30 g/L sugar, and a combination of 1 mg/L BA and 0.25 mg/L NAA, forming shoot clusters with the height of 2.2 cm, an average of 8.5 shoots per cluster and 9.7 leaves per cluster after 60 days of culture. Based on these results, a preliminary protocol for Mai vang HD01 micropropagation was established.

Prevalence and antibiotic resistance of Escherichia coli isolated from the respiratory tract of goats in Can Tho city, Vietnam

Thuan K. Nguyen, Ninh T. K. Truong, Vy L. P. Nguyen, Trung T. Truong, & Thuong T. Nguyen
Electronic version: 23 Dec 2024 | DOI: 10.52997/jad.6.02.2024
Abstract | PDF (159.3K)

Abstract

A total of 319 nasal swab samples were collected to clarify the prevalence and antimicrobial susceptibility of E. coli in the respiratory tract of goats in Can Tho, Vietnam. It indicated that E. coli was detected at a relatively minor rate (8.46%), and their prevalence in male goats and dairy goats was higher than that in others. However, the ages and health conditions of goats did not affect the presence of E. coli in those goats. Those E. coli strains were still susceptible to seven examined antibiotics, but the resistance was recorded in ampicillin (25.93%) and bactrim (25.93%) in this study. Those E. coli strains (33.33%) could resist one to seven antibiotics with several patterns; the pattern of ampicillin + amoxicillin/clavulanic acid (7.41%) was more common than others. Moreover, E. coli strains harbored antibiotic-resistance genes, and blaampC was detected at the highest rate (92.11%), followed by sulII (43.86%), tetA (24.56%), and qnrA (5.26%). Of those E. coli strains, 22.81% harbored two to four examined genes with several patterns of antibiotic-resistance genes; the most detected pattern was blaampC + sulII + tetA (7.89%). Thus, controlling the prevalence of antibiotic-resistant E. coli in the respiratory tract of goats will protect animal and public health.

Optimization of alkali-catalyzed organosolv treatment of spent coffee grounds for obtaining polysaccharides

Duong T. T. Nguyen, Sang V. Nguyen, Dong N. T. Le, Anh T. V. Nguyen, & Ly T. P. Trinh
Electronic version: 23 Dec 2024 | DOI: 10.52997/jad.6.04.2024
Abstract | PDF (2.7M)

Abstract

The coffee industry is growing rapidly and generating increasing amounts of spent coffee grounds annually. Spent coffee grounds contain high levels of polysaccharide, which needs in-depth research to obtain and transform into value-added products. This study was carried out to optimize the alkali-catalyzed organosolv treatment of spent coffee grounds to enrich the polysaccharide content. A three-factor central composite design of the response surface model was used to optimize the treatment variables including reflux time, NaOH, and acetone concentration to yield the highest polysaccharide level. As a result, the maximum polysaccharide content was 73.13% obtained at a reflux time of 4.5 h, 62% acetone with 0.91% NaOH. The polysaccharide-rich material from spent coffee ground was composed of 39.37% mannan, 10.40% glucan, and 9.33% galactan. Partial removal of lignin and protein was observed during the treatment. Enzymatic hydrolysis of the spent coffee polysaccharides released the highest reducing sugars of 5583 mg/L using an enzyme cocktail containing 4% of cellulase and 1% of mannanase after 96 h. The enzymatic hydrolysate contained 3190 mg/L mannose and 1790 mg/L glucose, showing a feasible transformation of spent coffee polysaccharides.

Community-based ecotourism: A case study in Thanh Phu district, Ben Tre province, Vietnam

Thinh V. D. Nguyen, Vy T. H. Nguyen, Nhi T. C. Bui, & Diem T. N. Phan
Electronic version: 23 Dec 2024 | DOI: 10.52997/jad.6.06.2024
Abstract | PDF (2.1M)

Abstract

This study explored the potential and challenges of community based ecotourism in Thanh Phu district, Ben Tre province, Vietnam. By investigating 52 households involved in community-based ecotourism through the Participatory Rural Appraisal method and semi-structured interviews, it outlined the transformative impact of community-based ecotourism on the local community. The research underscored positive outcomes in economic growth, social equity, and cultural preservation while highlighting the imperative need for prudent management to mitigate environmental concerns and prevent unsustainable tourism growth. It advocated for a balanced approach that integrated economic development with environmental and cultural preservation strategies. The findings emphasize the importance of tailored solutions to navigate challenges and foster sustainable community-based ecotourism, ensuring long-term prosperity while safeguarding the district’s natural and cultural treasures.

Aerogel materials from sugarcane bagasse: the effect of additives

Van T. T. Le, Ty H. Nguyen, Chien M. D. Vu, & Phuong T. Nguyen
Electronic version: 23 Dec 2024 | DOI: 10.52997/jad.6.05.2024
Abstract | PDF (2.8M)

Abstract

Cellulose nano fibers (CNF) are being considered as potential material for producing aerogel, an advanced materials for filtration technology. In this study, CNF were extracted from the sugarcance bagasse (a common agricultural waste) using ultrasonic technology and then fabricated with different additives including polyvinyl alcohol (PVA), polyethylene glycol (PEG) and graphene oxide (GO) to formulate aerogels. Various advanced techniques including polarized and scanning electron microscopy, fourier transform infrared spectroscopy (FTIR) and texture analyzer were applied to elaborate on the physicochsemical properties of the products. The obtained results revealed that aerogel had low bulk density (0.032 kg/m3; 0.035 kg/m3 & 0.041 kg/m3) and a high porosity (96.89%; 97.06% & 98.61%) when combined with PVA, PEG and GO, respectively. Among investigated samples, aerogel fabricated with GO had the highest mechanical resistance as well as the best elasticity.
Most Read
  • Optimization of maltodextrin and carrageenan gum concentration added in spray drying process of Pouzolzia zeylanica extract by response surface methodology
    Electronic version: 28 Jun 2018 | DOI: 10.52997/jad.11.03.2018
    Abstract | PDF (260.1K)

    Abstract

    Pouzolzia zeylanica is a kind of medicinal plant which is generally cultivated in Mekong Delta region. It owns many bioactive compounds that are known to possess antioxidant, antimicrobial and anticarcinogenic properties. This study aimed to optimize additional carrier concentration for spray drying of Pouzolzia zeylanica extract. Response Surface Methodology (RSM) with central composite design (CCD) was applied for optimization and investigation of the influence of maltodextrin (5÷15%, w/v) and carrageenan gum (0.06÷1.0%, w/v) concentration on the physicochemical characteristics of spray dried powder (bioactive compounds, moisture content as well as particle size distribution). The results showed that the optimum concentrations of maltodextrin and carrageenan gum were 8.8% w/v and 0.082% w/v, respectively. At these optimal conditions, the anthocyanin, flavonoid, polyphenol, tannin, moisture content and particle size of obtained spray dried powder were 5.77 mg cyanidin-3-glycoside equivalents (CE)/100 g; 29.49 mg quercetin equivalents (QE)/g; 28.35mg gallic acid equivalents (GAE)/g; 27.44 mg tannic acid equivalents (TAE)/g, 6.55% and 6.09 µm, respectively.
  • Case report of brachycephalic obstructive airway syndrome in brachycephalic dogs from Veterinary Specialist Service Hospital, Australia
    Electronic version: 30 Jun 2020 | DOI: 10.52997/jad.5.03.2020
    Abstract | PDF (260.1K)

    Abstract

    This report aimed to study symptoms and causes of brachycephalic obstructive airway syndrome (BOAS) in brachycephalic dogs and to determine appropriate surgical procedures for these symptoms by reviewing literatures and examining four case studies conducted at Veterinary Specialist Service Hospital, Underwood, Queensland, Australia. The cases included a 6-year 3-month old Staffordshire Bull Terrier (case 1), a 1-year 5-month old French Bulldog (case 2), an 8-month old French Bulldog (case 3), and an 8-year 8-month Pug (case 4). Those dogs went to the Veterinary Specialist Service in a worsen state of respiratory problems, including the upper respiratory noise (case 1, 2, 3), decrease in exercise tolerance, respiratory struggling (case 1, 3), regurgitation (case 1), coughing, sleeping difficulty, respiratory stridor (case 2), nasal discharge, dyspnea, bloating, and tachypnea (case 4). Examinations revealed the causes including the elongated soft palate (case 1, 2, 3, 4), stenotic nostrils (case 2, 3, 4), tonsils inflammation (case 3) and everted laryngeal saccules (case 4). After surgery, the dogs were recovered in intensive care unit within 2 days, and then discharged. Scheduled re-examination one week later showed improvement in the respiratory health in all cases. Overall, major complications occur in 10\% of cases; however, this surgery is vital and can be totally applied in Vietnam where brachycephalic dogs have become a popular companion.
  • Manufacturing performance system for SMEs: A prioritization of KPIs with fuzzy analytic hierarchy process
    Electronic version: 30 Jun 2020 | DOI: 10.52997/jad.1.03.2020
    Abstract | PDF (649.9K)

    Abstract

    In today’s increasing competitive global market, large and successful manufacturing enterprises have implemented the system of key performance indicators (KPIs) which drives the performance toward the business objectives; however, this is not the case for small-medium sized enterprises (SMEs) which have been increasingly important for any national economy, especially in manufacturing sector. Although the KPIs can ideally be constructed in accordance with the concept of SMART (Specific, Measureable, Attainable, Realistic, Time-related) or balanced scorecard, but SMEs that are lack of limited resources and expertise could rarely afford to build such systems with the appropriate definition and measurement of KPIs. Therefore, the paper aimed to provide systematically the system of KPIs adaptable to SMEs, to prioritize the importance of each proposed KPI with the application of a fuzzy analytic hierarchy process (FAHP), and to instruct the comprehensive deployment of the SMEs’ manufacturing performance system.
  • Application of PCR technique in diagnosis of four respiratory pathogenic bacteria in pigs at the slaughterhouse
    Electronic version: 28 Jun 2019 | DOI: 10.52997/jad.6.03.2019
    Abstract | PDF (260.1K)

    Abstract

    The polymerase chain reaction (PCR) for Actinobacillus pleuropneumonia (App), Haemophilus parasuis (Hps), Pasteurella multocida (Pm) and Bordetella bronchiseptica (Bb) were performed in pure colonies isolated  from 114 lung specimens  with lesions collected from the Vissan slaughterhouse  in Ho Chi Minh City from July 2018 to May 2019. The aim of the experiment was to identify the four respiratory pathogenic bacteria in pigs at slaughterhouse by using PCR technique. The criteria for evaluating the results  included the proportion of positive samples with multiplex PCR and percentage of samples co-infected with 2, 3, and 4 bacteria. Among a total of 114 injured lung samples, 21% of the samples was positive to at least one of the four bacteria, 3 samples (2.63%) were positive for App, 2 samples (1.75%) were positive for Hps, 7 samples (6.14%) were for Pm, and 12 lungs (10.53%) were positive for Bb. One sample (0.88%) was found co-infected with Pm and Hps.
  • Influence of stocking density on water quality and growth performance of whiteleg shrimp (Litopenaeus vannamei) reared in fiberglass tanks, without water exchange
    Electronic version: 27 Dec 2019 | DOI: 10.52997/jad.3.06.2019
    Abstract | PDF (3.4M)

    Abstract

    The present study evaluated the effects of stocking density on water quality parameters, growth performance and survival rate of white leg shrimp Litopenaeus vannamei, reared in fiberglass tanks, without water exchange. Three stocking densities (50, 100 and 200 shrimp/m2) were tested. Each treatment consisted of three replicate fiberglass tanks (500 L). The shrimp were fed ad libitum four times per day with a commercial pellet (40-42% protein). After an 8-week trial, concentrations of nutrients in the culture tanks showed an increasing linear relationship with increasing stocking density. The growth performance of shrimp in low stocking densities was significantly greater than that in high stocking densities. The results from this study demonstrate that with increasing the stocking density the production of shrimp increased but n a low final weight and survival compared to low stocking density.