Lee Ji-Yeon, Kim Ill-Hwa
College of Veterinary Medicine, Chungbuk National University, Cheongju 361-763, Korea.
J Vet Sci. 2006 Jun;7(2):161-6. doi: 10.4142/jvs.2006.7.2.161.
The objectives of this study were to determine the effects of parity on milk production, body condition change, periparturient health, and culling in Korean dairy herds. The data utilized included; milk yield, body condition score, cow parity, calving condition, periparturient disorders, culling, and reproductive status, which were recorded from 1290 calvings in eight dairy herds. The mean milk yield in cows over 305 days increased with increasing parity (p < 0.01). Cows with parities of 3, 4, and 5 or higher lost more body condition than those with a parity of 1 during month 1 of lactation (p < 0.01), and body condition recovery by cows with parities of 4 and 5 or higher was slower (p < 0.01) than recovery by cows with parities of 1, 2, or 3 until month 3 of lactation. The risk of retained placenta, metabolic disorder, and endometritis also increased with advancing parity (p < 0.05). Moreover, the incidence of ovarian cysts was lower in cows with a parity of one than in cows with greater parities (p < 0.01). Culling rate due to reproductive failure also increased with advancing parity (p < 0.01). These results suggest that parity increases milk yield, body condition loss during early lactation, the risk of periparturient disorders, and culling due to reproductive failure in dairy herds.
本研究的目的是确定胎次对韩国奶牛群产奶量、体况变化、围产期健康及淘汰率的影响。所使用的数据包括产奶量、体况评分、奶牛胎次、产犊情况、围产期疾病、淘汰率及繁殖状态，这些数据来自8个奶牛场的1290次产犊记录。305天以上奶牛的平均产奶量随胎次增加而提高（p<0.01）。胎次为3、4及5胎或更高的奶牛在泌乳第1个月时比胎次为1的奶牛体况损失更多（p<0.01），且胎次为4及5胎或更高的奶牛直到泌乳第3个月时体况恢复比胎次为1、2或3的奶牛更慢（p<0.01）。胎盘滞留、代谢紊乱及子宫内膜炎的风险也随胎次增加而升高（p<0.05）。此外，胎次为1的奶牛卵巢囊肿发生率低于胎次更高的奶牛（p<0.01）。因繁殖失败导致的淘汰率也随胎次增加而升高（p<0.01）。这些结果表明，胎次会增加奶牛群的产奶量、泌乳早期的体况损失、围产期疾病风险及因繁殖失败导致的淘汰率。
