Islam M.,Sylhet Agricultural University |
Hoque M.M.,Oklahoma State University
Environmental Quality Management | Year: 2016
In this article, the authors explore their recent study, which introduces the concept of extracting saline water and fresh water simultaneously from groundwater aquifers to produce water that is suitable for irrigation. To achieve these results, multiwell modeling concepts are used to exploit both the saline and nonsaline aquifer domains from geologic formations where a freshwater aquifer domain is either underlain or overlain by a saline aquifer domain. The water from these domains are either mixed to an acceptable salinity level after independent withdrawal from separate, saline or nonsaline domains present within the same aquifer, or mixed from the domains to achieve acceptable levels of salinity before withdrawal. © 2016 Wiley Periodicals, Inc.
Akter F.,Bangladesh Agricultural University |
Moslehuddin A.Z.M.,Bangladesh Agricultural University |
Kader M.A.,Bangladesh Agricultural University |
Sarker M.M.H.,Sylhet Agricultural University |
Mori Y.,Kyushu University
Journal of the Faculty of Agriculture, Kyushu University | Year: 2015
Bangladesh is consisting of 30 Agroecological Regions (AEZs) and the applied agricultural research has been conducted based on this. In context of the lack of enough information on mineralogy based on AEZs, an attempt has been taken to study the mineralogy of important soils from all AEZs of Bangladesh in order to provide basic information for applied research. As part of this attempt, the mineralogy of twenty four soils from three representative soil series (Ramgati, Hatiya and Silonia) of AEZ 18, Young Meghna Estuarine Floodplain, has been reported in the current paper. The clay content of the surface soils ranged from 8.7 to 29.4%. According to the USDA system, thirteen soil samples were silt loam, eight were silt and only one was silty clay loam. The <2 μm clay fraction was dominated by mica. Chlorite and kaolinite were also identified as dominant mineral in almost all soils. Smectite, and vermiculite and/or vermiculite-chlorite intergrade minerals were also detected in most soils. The variation in the mineralogical composition was supposed to be attributed from the difference in the proportion of parent sediments from three major rivers of Bangladesh.
Paul S.,Copenhagen University |
Paul S.,Sylhet Agricultural University |
Agger J.F.,Copenhagen University |
Agerholm J.S.,Copenhagen University |
Markussen B.,Copenhagen University
Preventive Veterinary Medicine | Year: 2014
Antibodies to Coxiella burnetii have been found in the Danish dairy cattle population with high levels of herd and within herd seroprevalences. However, the prevalence of antibodies to C. burnetii in Danish beef cattle remains unknown. The objectives of this study were to (1) estimate the prevalence and (2) identify risk factors associated with C. burnetii seropositivity in Danish beef and dairy cattle based on sampling at slaughter.Eight hundred blood samples from slaughtered cattle were collected from six Danish slaughter houses from August to October 2012 following a random sampling procedure. Blood samples were tested by a commercially available C. burnetii antibody ELISA kit. A sample was defined positive if the sample-to-positive ratio was greater than or equal to 40. Animal and herd information were extracted from the Danish Cattle Database. Apparent (AP) and true prevalences (TPs) specific for breed, breed groups, gender and herd type; and breed-specific true prevalences with a random effect of breed was estimated in a Bayesian framework. A Bayesian logistic regression model was used to identify risk factors of C. burnetii seropositivity. Test sensitivity and specificity estimates from a previous study involving Danish dairy cattle were used to generate prior information.The prevalence was significantly higher in dairy breeds (AP = 9.11%; TP = 9.45%) than in beef breeds (AP = 4.32%; TP = 3.54%), in females (AP = 9.10%; TP = 9.40%) than in males (AP = 3.62%; TP = 2.61%) and in dairy herds (AP = 15.10%; TP = 16.67%) compared to beef herds (AP = 4.54%; TP = 3.66%). The Bayesian logistic regression model identified breed group along with age, and number of movements as contributors for C. burnetii seropositivity. The risk of seropositivity increased with age and increasing number of movements between herds. Results indicate that seroprevalence of C. burnetii is lower in cattle sent for slaughter than in Danish dairy cows in production units. A greater proportion of this prevalence is attributed to slaughtered cattle of dairy breeds or cattle raised in dairy herds rather than beef breeds. © 2014 Elsevier B.V.
Nagaoka T.,Niigata University |
Doullah M.A.U.,Sylhet Agricultural University |
Matsumoto S.,National Institute of Vegetable and Tea Science NIVTS |
Kawasaki S.,Japan National Institute of Agrobiological Science |
And 3 more authors.
Theoretical and Applied Genetics | Year: 2010
To perform comparative studies of CR (clubroot resistance) loci in Brassica oleracea and Brassica rapa and to develop marker-assisted selection in B. oleracea, we constructed a B. oleracea map, including specific markers linked to CR genes of B. rapa. We also analyzed CR-QTLs using the mean phenotypes of F3 progenies from the cross of a resistant double-haploid line (Anju) with a susceptible double-haploid line (GC). In the nine linkage groups obtained (O1-O9), the major QTL, pb-Bo(Anju)1, was derived from Anju with a maximum LOD score (13.7) in O2. The QTL (LOD 5.1) located in O5, pb-Bo(GC)1, was derived from the susceptible GC. Other QTLs with smaller effects were found in O2, O3, and O7. Based on common markers, it was possible to compare our finding CR-QTLs with the B. oleracea CR loci reported by previous authors; pb-Bo(GC)1 may be identical to the CR-QTL reported previously or a different member contained in the same CR gene cluster. In total, the markers linked to seven B. rapa CR genes were mapped on the B. oleracea map. Based on the mapping position and markers of the CR genes, informative comparative studies of CR loci between B. oleracea and B. rapa were performed. Our map discloses specific primer sequences linked to CR genes and includes public SSR markers that will promote pyramiding CR genes in intra- and inter-specific crosses in Brassica crops. Five genes involved in glucosinolates biosynthesis were also mapped, and GSL-BoELONG and GSL-BoPro were found to be linked to the pb-Bo(Anju)1 and Bo(GC)1 loci, respectively. The linkage drag associated with the CR-QTLs is briefly discussed. © 2010 Springer-Verlag.
Mostafa Shamsuzzaman M.,Sylhet Agricultural University |
Kumar Biswas T.,Chittagong University
Egyptian Journal of Aquatic Research | Year: 2012
A study was carried out to understand, current status of the use of chemicals and antibiotics for penaid shrimp health management. Data was collected through questionnaire interview, personal contact, market survey and participatory rural appraisal like focus group discussion with target group in south west coast of Bangladesh. A range of chemicals including antibiotics were found available in market and being used in the aquaculture sector. Commonly found traditional chemicals in heath management included lime, salt, potassium permanganate, sumithion, melathion, formalin, bleaching powder and malachite green. Major active ingredients of these antibiotics were oxytetracycline, chlorotetracycline, amoxicillin, co-trimoxazoie, sulphadiazine and sulphamethoxazole. Among the available antibiotics, oxysentin 20%, renamox, renamycin and orgamycine 15% was being used widely by the freshwater aqua farmers in Jessore area. Thirteen branded probiotics were also found in the market to use mainly by the coastal shrimp farmers against vibriosis and other luminescent bacteria to improve water and soil quality. The study also indicated some problems associated with the use of such chemicals due to lack of knowledge of farmers about the use of chemicals, appropriate dose, method of application and their indiscriminate use of chemicals. © 2013.
Alam M.M.M.,University of Iceland |
Alam M.M.M.,Sylhet Agricultural University |
Palsson S.,University of Iceland
Marine Biology Research | Year: 2016
Penaeus monodon is the most economically important penaeid shrimp in the Indo-West Pacific region for both aquaculture and wild capture. This study evaluated the population structure of P. monodon in Bangladesh and searched for signs of natural selection in immunological genes. Wild P. monodon sampled at four locations off Bangladesh were studied using 10 microsatellite markers and 14 single nucleotide polymorphic sites (SNPs), including six unannotated regions and eight immunological genes (seven C-type lectin and one HLA3), of which variations were associated with tolerance to pathogens and survival in aquaculture. Three genetically distinguishable populations were observed, one in the eastern mangrove forest in the Sundarban–Barguna coast (south Bangladesh), the second in the Sundarban–Middle ground close to the delta of the river Ganges and the third at St Martin’s Island, southeastern Bangladesh. (Formula presented.) ranged from 0.042 to 0.093, and significant FST ranged from 0.004 to 0.011. A large proportion of individuals caught in Middle ground and at St Martin’s Island showed a genetic origin that was distinct from the other individuals at those sites, possibly from unsampled southern regions in the Bay of Bengal. Variation and the FST values for the SNPs from C-type lectin genes and HLA3 did not differ from the other markers studied, indicating no selective effects at these loci in the natural populations. Sustainable management of P. monodon should consider the population differentiation described in this study. Further assessment of signs of selection in aquaculture stocks could be useful for successful breeding of the species. © 2016 Informa UK Limited, trading as Taylor & Francis Group
Ghaedi A.,Iranian Fisheries Research Organization Ifro |
Kabir M.A.,Sylhet Agricultural University |
Hashim R.,Universiti Sains Malaysia
Aquaculture Research | Year: 2016
Present study aimed to determine the optimum dietary lipid level in snakehead murrel channa striatus broodstocks. Triplicate groups of fish were fed for 240 days with isonitrogenous experimental diets with increasing lipid levels (100, 140, and 180 g kg-1), using fish oil and soybean oil as the lipid sources with the ratio of (1:1). Weight gain, GSI, fecundity, oocyte diameter and number of mature oocyte were found to be significantly higher in the group fed with diet containing 180 g kg-1 lipid level. Muscle fatty acid profile showed a significant increase in LA (18:2n-6), LNA (18:3n3), total PUFA, n-6 and ArA (20:4n-6) in fish fed with diet containing 180 g kg-1 lipid. Increasing lipid level up to 180 g kg-1 resulted in significant increase in PUFA (LA & LNA), lc-PUFA (EPA, DHA, ArA), total PUFA, n-3 and n-6 series in ovary and liver of female C. striatus. © 2016 John Wiley & Sons Ltd.
PubMed | Damanhour University, University of Veterinary and Animal Sciences, Obafemi Awolowo University, Sylhet Agricultural University and University of Pretoria
Type: | Journal: Acta tropica | Year: 2016
Live bird market (LBM) is integral component in the perpetuation of HPAI H5N1, while biosecurity is crucial and key to the prevention and control of infectious diseases. Biosecurity compliance level and risk factor assessments in 155LBMs was evaluated in Nigeria and Egypt through the administration of a 68-item biosecurity checklist, scored based on the modifications of previous qualitative data, and analysed for degree of compliance. LBMs were scored as complied with a biosecurity item if they had good-very good scores (4). All scores were coded and analysed using descriptive statistics and risk or protective factors were determined using univariable and multivariable logistic regression at p0.05. Trading of wild birds and other animal in the LBMs (Odd Ratio (OR)=34.90; p=0.01) and claims of hand disinfection after slaughter (OR=31.16; p=0.03) were significant risk factors while mandatory routine disinfection of markets (OR=0.13; p0.00), fencing and gates for live bird market (OR=0.02; p0.01) and hand washing after slaughter (OR=0.41; p0.05) were protective factors for and against the infection of Nigerian and Egyptian LBMs with the HPAI H5N1 virus. Almost all the LBMs complied poorly with most of the variables in the checklist (p0.05), but pathways to improved biosecurity in the LBMs existed. We concluded that the LBM operators play a critical role in the disruption of transmission of H5N1 virus infection through improved biosecurity and participatory epidemiology and multidisciplinary approach is needed.
PubMed | Kagoshima University and Sylhet Agricultural University
Type: | Journal: Fish & shellfish immunology | Year: 2016
Our study explored the dietary effects of adenosine monophosphate (AMP) to enhance growth, digestibility, innate immune responses and stress resistance of juvenile red sea bream. A semi-purified basal diet supplemented with 0% (Control), 0.1% (AMP-0.1), 0.2% (AMP-0.2), 0.4% (AMP-0.4) and 0.8% (AMP-0.8) purified AMP to formulate five experimental diets. Each diet was randomly allocated to triplicate groups of fish (mean initial weight 3.4g) for 56 days. The results indicated that dietary AMP supplements tended to improve growth performances. One of the best ones was found in diet group AMP-0.2, followed by diet groups AMP-0.1, AMP-0.4 and AMP-0.8. The Apparent digestibility coefficients (dry matter, protein and lipid) also improved by AMP supplementation and the significantly highest dry matter digestibility was observed in diet group AMP-0.2. Fish fed diet groups AMP-0.2 and AMP-0.4 had significantly higher peroxidase and bactericidal activities than fish fed the control diet. Nitro-blue-tetrazolium (NBT) activity was found to be significantly (P<0.05) greater in fish fed diet groups AMP-0.4 and AMP-0.8. Total serum protein, lysozyme activity and agglutination antibody titer were also increased (P>0.05) by dietary supplementation. In contrast, catalase activity decreased with AMP supplementation. Moreover, the fish fed AMP supplemented diets had better improvement (P<0.05) in body lipid contents, condition factor, hematocrit content and glutamyl oxaloacetic transaminase (GOT) level than the control group. Supplementation also improved both freshwater and oxidative stress resistances. Interestingly, the fish fed diet groups AMP-0.2 and AMP-0.4 showed the least oxidative stress condition. Finally it is concluded that, dietary AMP supplementation enhanced the growth, digestibility, immune response and stress resistance of red sea bream. The regression analysis revealed that a dietary AMP supplementation between 0.2 and 0.4% supported weight gain and lysozyme activity as a marker of immune functions for red sea bream, which is also inline with the most of the growth and health performance parameters of fish under present experimental conditions.
PubMed | Emergency Center for Transboundary Animal Diseases, Mymensingh Medical College Hospital, Anglia Ruskin University, Emory University and 5 more.
Type: | Journal: Veterinary microbiology | Year: 2016
Avian influenza viruses (AIVs) continue to pose a global threat. Waterfowl are the main reservoir and are responsible for the spillover of AIVs to other hosts. This study was conducted as part of routine surveillance activities in Bangladesh and it reports on the serological and molecular detection of H5N1 AIV subtype. A total of 2169 cloacal and 2191 oropharyngeal swabs as well as 1725 sera samples were collected from live birds including duck and chicken in different locations in Bangladesh between the years of 2013 and 2014. Samples were tested using virus isolation, serological tests and molecular methods of RT-PCR. Influenza A viruses were detected using reverse transcription PCR targeting the virus matrix (M) gene in 41/4360 (0.94%) samples including both cloacal and oropharyngeal swab samples, 31 of which were subtyped as H5N1 using subtype-specific primers. Twenty-one live H5N1 virus isolates were recovered from those 31 samples. Screening of 1,868 blood samples collected from the same birds using H5-specific ELISA identified 545/1603 (34%) positive samples. Disconcertingly, an analysis of 221 serum samples collected from vaccinated layer chicken in four districts revealed that only 18 samples (8.1%) were seropositive for anti H5 antibodies, compared to unvaccinated birds (n=105), where 8 samples (7.6%) were seropositive. Our result indicates that the vaccination program as currently implemented should be reviewed and updated. In addition, surveillance programs are crucial for monitoring the efficacy of the current poultry vaccinations programs, and to monitor the circulating AIV strains and emergence of AIV subtypes in Bangladesh.