Protection of colostral antibodies against bovine leukemia virus infection in calves on a California dairy.

摘要: A three-year prospective study involving 244 calves was undertaken on a California dairy to evaluate the protective role of colostral antibodies against bovine leukemia virus (BLV) infection in calves. Calves were followed from birth time they left their individual hutch (TLIH), at about 90 days age. The probability being infected TLIH and daily risk between modelled using logistic Cox models, respectively. with no detectable during first week life up 2.00 2.75 times more likely be compared low high concentrations life, respectively (p = 0.01). When modelled, without estimated day 3.4 11.6 become than that day, less 0.001). Results indicated calfhood may reduced by 45% through feeding colostrum BLV antibodies. Further reduction possible milk powder, replacer, and/or noninfected cows. also quantification effect time-dependent factor, such as antibody concentration, might affected if treated fixed factor.