Seroprevalence and Influence of Bovine Leukemia Virus on the Incidence of Mastitis in Dairy Herds
نویسندگان
چکیده
Background: The enzootic bovine leukosis (EBL) is a viral disease with chronic aspect and its etiological agent an oncogenic deltaretrovirus called leukemia virus (VLB). It has wide distribution in dairy cattle herds, it may take several years before the first clinical manifestations occur. Animals seropositive for VLB are more susceptible to developing infectious diseases such as mastitis. objective of this study was evaluate seroprevalence EBL, prevalence mastitis, possible association between risk factors related municipalities Caparaó region Espírito Santo, Brazil.Materials, Methods & Results: mastitis were evaluated 854 clinically healthy crossbred (Bos tauros x Bos taurus indicus) cows used, different lactation phases, from farms located 12 that compose Capixaba micro-region, southern part Brazil, period February July 2015. EBL determined by agar gel immunodiffusion test, presence ascertained black background mug test subclinical CMT. reuse needles, type milking, reproductive management, calf mortality, problems milk yield assessed. variables estimated odds ratio (95% confidence interval). significance associations Chi-square test. 56.79%, 5.50% 43.55%, respectively. There positive (P < 0.05, OR = 1.41, CI 1.07-1.86). disposable needles (OR 1.92, 1.46-2.53), mechanical milking 2.03, 1.34-3.08), mortality 2.39; 1.25-4.55) 1.62; 1.23-2.14) considered associated LEB 0.05).Discussion: Enzootic disseminated herds study. lack knowledge about among farmers failure adopt measures control elimination favor appearance new cases herd. Factors animal age, absence exams when purchasing animals, gloves rectal palpation contribute dissemination infection. economic losses can even be greater than those caused differences breeding system, intensification level production. In context, we noted much larger number animals infection, where not perceptible farmers. concluded widespread Santo's region. high some cities surveyed. increases chances EBL. Seroreagent likely present problems. necessary discuss best sanitary management system region, better social response then carry out elaboration educational implementation measures, through technical assistance.
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ژورنال
عنوان ژورنال: Acta Scientiae Veterinariae
سال: 2021
ISSN: ['1678-0345', '1679-9216']
DOI: https://doi.org/10.22456/1679-9216.109458