Warnick L D, Erb H N, White M E
Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA.
J Dairy Sci. 1995 Dec;78(12):2819-30. doi: 10.3168/jds.S0022-0302(95)76912-0.
The association of owner-diagnosed calfhood diseases with first lactation milk production was evaluated using data collected prospectively for 728 heifers from 25 New York dairy herds. Cows diagnosed with one or more occurrences of dullness, respiratory disease, or scours within 90 d of birth had first lactation milk production that was similar to that of unaffected herdmates. Estimates for the effects of dullness, respiratory disease, and scours on second test milk production were -1.0, 1.0, and .4 kg/d, respectively (adjusted for season and age at calving, times milked per day, study month on birth, sire PTA for milk production, and the other two calfhood diseases). Estimates for the effects on 305-day mature equivalent production were -139, 123, and 158 kg for dullness, respiratory disease, and scours, respectively (adjusted for study month of birth, sire PTA for milk production, and the other two calfhood diseases). These results were based on data of heifers that were selected as replacements and remained in the herd long enough to have milk production recorded. There was no significant detrimental effect of owner-diagnosed calfhood disease on first lactation milk production, but affected heifers had higher mortality before calving and were less likely to enter the milking herd.
利用前瞻性收集的来自纽约25个奶牛场728头小母牛的数据，评估了养殖户诊断的犊牛期疾病与首次产奶量之间的关联。在出生后90天内被诊断出有一次或多次精神沉郁、呼吸道疾病或腹泻的母牛，其首次产奶量与未受影响的同群牛相似。精神沉郁、呼吸道疾病和腹泻对第二次测奶量的影响估计分别为-1.0、1.0和0.4千克/天（根据产犊季节和年龄、每天挤奶次数、出生研究月份、 sire PTA产奶量以及其他两种犊牛期疾病进行了调整）。精神沉郁、呼吸道疾病和腹泻对305天成熟当量产量的影响估计分别为-139、123和158千克（根据出生研究月份、 sire PTA产奶量以及其他两种犊牛期疾病进行了调整）。这些结果基于被选为后备牛并在牛群中停留足够长时间以记录产奶量的小母牛的数据。养殖户诊断的犊牛期疾病对首次产奶量没有显著的有害影响，但受影响的小母牛在产犊前死亡率较高，进入挤奶牛群的可能性较小。
