Prevalence and risk factors of subclinical bovine mastitis in some dairy farms of Sylhet district of Bangladesh
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
A cross-sectional study was undertaken to report prevalence and to identify risk factors of subclinical mastitis of dairy cattle in Sylhet district of Bangladesh. Among 325 dairy farms of the district 12 farms(3.7%) were selected conveniently for this study. All the dairy cows of the 12 farms were selected for sample collection. Fresh milk samples from each of the selected dairy cows were collected aseptically in separate sterilized test tube as RF, RH, LF and LH quarter of the udder. Rapid modified White Side Test(WST) was used to detect subclinical mastitis(SCM). Results of WST and data derived from filled in questionnaire were entered in Microsoft Excel 2003 and transferred to STATA®, version 8.0/Intercooled (Stata Corporation, Texas, USA, 2003). The overall prevalence of SCM and its distribution in different categories of variables in cow and their exact binomial 95% confidence intervals were calculated in STATA®. Simple bivariable associations among independent variables were investigated by χ2 test in STATA®. Multiple logistic regression analysis with backward elimination method was used to identify risk factors of SCM. To identify significant variation in quarter SCM, linear regression analysis was performed after arcsine trans-formation of the data. The overall prevalence of SCM found in this study is 54%. Dairy cows with teat lesions had significantly increased SCM(OR=12342, P value=0.000, 95% CI=762, 199798) than others without teat lesions. The Holstein FriesianXJerseyXSahiwal breed has significantly decreased(OR=0.18, p=0.03, 95% CI 0.04, 0.85) SCM than other breeds. The prevalence of SCM found in this study is in agreement with others. The injury in the teat increases the probability of getting infected with microbes and thereby mastitis. If the prevalence of teat lesion can be decreased the probability of subclinical mastitis will also be decreased. The negatively associated Holstein FriesianXJerseyXSahiwall breed may help in planning mastitis control program if this finding can be validated by a more powerful case-control or cohort study design.
Abstract
A cross-sectional study was undertaken to report prevalence and to identify risk factors of subclinical mastitis of dairy cattle in Sylhet district of Bangladesh. Among 325 dairy farms of the district 12 farms(3.7%) were selected conveniently for this study. All the dairy cows of the 12 farms were selected for sample collection. Fresh milk samples from each of the selected dairy cows were collected aseptically in separate sterilized test tube as RF, RH, LF and LH quarter of the udder. Rapid modified White Side Test(WST) was used to detect subclinical mastitis(SCM). Results of WST and data derived from filled in questionnaire were entered in Microsoft Excel 2003 and transferred to STATA®, version 8.0/Intercooled (Stata Corporation, Texas, USA, 2003). The overall prevalence of SCM and its distribution in different categories of variables in cow and their exact binomial 95% confidence intervals were calculated in STATA®. Simple bivariable associations among independent variables were investigated by χ2 test in STATA®. Multiple logistic regression analysis with backward elimination method was used to identify risk factors of SCM. To identify significant variation in quarter SCM, linear regression analysis was performed after arcsine trans-formation of the data. The overall prevalence of SCM found in this study is 54%. Dairy cows with teat lesions had significantly increased SCM(OR=12342, P value=0.000, 95% CI=762, 199798) than others without teat lesions. The Holstein FriesianXJerseyXSahiwal breed has significantly decreased(OR=0.18, p=0.03, 95% CI 0.04, 0.85) SCM than other breeds. The prevalence of SCM found in this study is in agreement with others. The injury in the teat increases the probability of getting infected with microbes and thereby mastitis. If the prevalence of teat lesion can be decreased the probability of subclinical mastitis will also be decreased. The negatively associated Holstein FriesianXJerseyXSahiwall breed may help in planning mastitis control program if this finding can be validated by a more powerful case-control or cohort study design.
참고문헌 (21)
- Faruq MR, "Care of milch cows", pp.41~42 (1996), Khamar(Dec-Jan. Issue
- Rahman MS, "Prevalence and distribution of mastitis in cross bred and exotic dairy cows", Bangladesh Vet, 14, pp.1~4 (1997)
- Mahbub-E-Elahi ATM, "Isolation and identification of bacteria from different quarters of mastitis after dairy cows in Bangladesh", Bangladesh Vet J, 30, pp.63~65 (1996)
- Blowey RW, "An assessment of the economic benefits of a mastitis control scheme", Vet Rec, 119, pp.551~553 (1986)
- Lucey S, "The association between clinical mastitis and milk yield in dairy cows", Anim Prod, 39, pp.165~175 (1984)
- Grohn Y, "An epidemiological and genetic study on registered diseases in Finnish Ayrshire cattle. I. The data, disease occurrence and culling", Acta Vet Scand, 27, pp.182~195 (1986)
- Prodhan MAM, "Prevalence of subclinical mastitis in cows of Baghabari Milk-shed Area", Bangladesh Vet J, 30, pp.59~61 (1996)
- Sen MM, "Application of indirect tests to detect subclinical mastitis in milch cows", Bangladesh Vet J, 30, pp.137~139 (1996)
- Murphy JM, "A modified Whiteside test for the detection of mastitis milk", Cornell Vet, 31, pp.47~55 (1941)
- Dohoo IR, "An overview of techniques for dealing with large numbers of independent variables in epidemiologic studies", Prev Vet Med, 29(3), pp.221~239 (1996)
- Dohoo IR, "Veterinary epidemiologic research" (2003), AVC Inc. Charlottetown, Prince Edward Island, Canada
- Pal B, "A note on the incidence of subclinical bovine mastitis and in vitro drug sensitivity test of bacterial isolates", Indian Vet J, 66(8), pp.785~787 (1989)
- Zingeser J, "National survey of clinical and subclinical mastitis in Jamaican dairy herds, 1985-1986", Trop Anim Health Prod, 23, pp.2~10 (1986)
- Ramachandraiah M, "Survey of mastitis in a pure Jersey herd", Indian Vet J, 67, pp.103~106 (1990)
- Mahmoud AA, "Some studies on sub-clinical mastitis in dairy cattle", Assiut Vet Med J, 20, pp.149~154 (1988)
- Choudhury TIMFR, "Microflora of milk in a single Dairy Herd", Pakistan J Vet Sci, 1, pp.3~ (1967)
- Watkins GH, "A field investigation of subclinical mastitis in sheep in southern England", Br Vet J, 147(5), pp.413~431 (1991)
- Parai TP, "Incidence of subclinical mastitis in crossbred and exotic cows", Indian J Vet Med, 12, pp.16~ (1992)
- Swati S, "Comparative efficacy of some indirect tests in the diagnosis of subclinical mastitis", Indian J Vet Med, 22(2), pp.112~113 (2002)
- Dangore AD, "Evaluation of some byre-side tests in bovine subclinical mastitis", Indian Vet J, 77(5), pp.380~381 (2000)
- Cardozo RM, "Evaluation of subclinical matitis test in dairy cattle", Revista Unimar, 18(3), pp.627~636 (1996)