Roy J H B
National Institute for Research in Dairying, Shinfield, Reading, Gt. Britain.
Livest Prod Sci. 1983 Aug;10(4):339-349. doi: 10.1016/0301-6226(83)90018-0. Epub 2003 Oct 2.
Protection of calves against enteric and respiratory disorders is dependent on the passive immunity that the calf has received, its innate resistance to infection, the burden of infection in the environment and the nutrition of the calf. Superimposed on these, are the effects of management and physical environment. The plane of nutrition required for dairy heifers during rearing depends on the age at first calving, and for meat animals depends on the carcass weight and fat deposition required at a particular slaughter date in relation to time of birth.
犊牛对肠道和呼吸道疾病的抵抗力取决于其获得的被动免疫、对感染的先天抵抗力、环境中的感染负荷以及犊牛的营养状况。除此之外，管理和物理环境也会产生影响。饲养期间奶牛小母牛所需的营养水平取决于首次产犊的年龄，而肉牛所需的营养水平则取决于特定屠宰日期相对于出生时间所需的胴体重量和脂肪沉积量。
