Effect of infection with bovine leukemia virus on milk production in Michigan dairy cows
Effect of infection with bovine leukemia virus on milk production in Michigan dairy cows
复制标题
DOI：
10.3168/jds.2015-10089
复制
发表时间：
2016-03-01
影响因子：
3.5
通讯作者：
Erskine, R. J.
中科院分区：
文献类型：
--
作者：
Norby, B.;Bartlett, P. C.;Erskine, R. J.
本研究的目的是确定个体奶牛水平的产奶量和牛白血病病毒（BLV）感染之间的关联，通过牛奶BLV-ELISA测定。奶牛群改良技术人员从105个荷斯坦奶牛群（>= 120头产奶奶牛）中的第一、第二、第三和4+胎次奶牛各采集10头奶牛的奶样。通过ELISA检测乳汁样品中是否存在抗BLV抗体。通过农场调查和奶牛群改进记录收集了有关奶牛和牛群的其他数据。使用所有奶牛和仅2+胎次奶牛的一组混合效应模型研究BLV ELISA校正光密度与个体奶牛305-d成熟当量之间的相关性。BLV牛奶阳性与305天成熟当量产量下降，特别是在老年奶牛。此外，增加牛奶ELISA校正的光密度与奶牛水平的产奶量损失增加有关。总之，我们的研究结果提供的证据表明，BLV感染与密歇根州奶牛产奶量下降。
The objective of this study was to determine the association between individual cow-level milk production and bovine leukemia virus (BLV) infection as measured by milk BLV-ELISA. Dairy Herd Improvement technicians collected milk samples from 10 cows from each of first, second, third, and 4+ parity cows in 105 Holstein herds with >= 120 milking cows. Milk samples were tested for the presence of anti-BLV antibodies by ELISA. Additional data regarding the cows and the herds were collected by farm survey and Dairy Herd Improvement records. A set of mixed-effect models using all cows and only 2+ parity cows were used to investigate the association between BLV ELISA-corrected optical density and 305-d mature equivalents of individual cows. The BLV milk positivity was associated with decreased 305-d mature-equivalent yields, especially among the older cows. Additionally, increasing milk ELISA-corrected optical density was associated with increasing loss of milk production at the cow level. In summary, our results provide evidence that BLV infection is associated with decreased milk production in Michigan dairy cows.