Abstract：
The objectives of this study were to conduct a survey of failure-of-passive-transfer (FPT) in eastern Hokkaido Japan, to evaluate the association between herd-level FPT and death and culling or treatment, and to test the effectiveness of monitoring using herd-level FPT. A total of 4,411 Holstein and Holstein-Wagyu crossbreds calves born from Holstein dams during the year beginning April 2, 2019 on 39 dairy farms were included in the study to investigate death-and-culling and the treatment rate during the first month of life, as well as rearing management up to 3 weeks of age. A subset of Holsteins (n=381) was included in the study for passive transfer and farms were diagnosed as having FPT if more than 20% of newborn calves had serum IgG levels below 10 g/L at the herd level. The prevalence of FPT (
摘要：
这项研究的目的是对日本北海道东部的被动转移失败（FPT）进行调查，为了评估群体水平FPT与死亡、扑杀或治疗之间的关系，并测试使用群体级FPT进行监测的有效性。从2019年4月2日开始的一年中，在39个奶牛场中，共有4,411只从Holstein大坝出生的Holstein和Holstein-Wagyu杂交小牛被纳入研究，以调查死亡和扑杀以及第一个月的治疗率。以及3周龄的饲养管理。在被动转移的研究中包括了荷斯坦斯泰因的子集（n=381），如果超过20％的新生小牛的血清IgG水平低于10g/L，则农场被诊断为患有FPT。农场FPT（
