Effects of fractionated colostrum replacer and vitamins A, D, and E on haptoglobin and clinical health in neonatal Holstein calves challenged with Mycobacterium avium ssp. paratuberculosis

分级初乳替代品和维生素 A、D 和 E 对感染鸟分枝杆菌亚种副结核病的新生荷斯坦犊牛的结合珠蛋白和临床健康的影响