不同结构的日粮对犊牛生长发育的影响

本试验采用单因素完全随机实验设计,把39头犊牛随机分为三组:早期断奶(EW)组、低奶量(LQM)组和充裕奶量(HQM)组,研究掌握不同结构的日粮对犊牛生长发育的影响。结果表明:三组犊牛7日龄时各项体尺指标均差异不显著(p>0.05)。30日龄时,LQM组犊牛体斜长、胸围最大,分别为78.2cm,92.1cm,且与其它两组比较有显著差异(p<0.05),表明犊牛此阶段,LQM组的日粮结构和营养水平适合犊牛的骨骼发育。对犊牛实施早期断奶虽然对60日龄以前犊牛的生长有一定影响,但61～90日龄通过饲喂相同结构和营养水平日粮后使犊牛得到补偿生长,因此在北方寒区应用早期断奶技术培育犊牛是可行的。

Effects of Different Forms of Diet on The Growth of Calves

Thirty-nine Holstein bull-calf were selected and allocated randomly into three treatments as: early-weaned(EW)group, low quantum of milk(LQM)group and high quantum of milk (HQM)group. In order to study the effect of different forms of diet on development and growth of calves, The results showed that the difference of each body measurement index was not significantly in three groups at the age of 7days(P>0.05).At the age of 30 days the diagonal length of the barrel and chest circumference of LQM group was highest in three groups with 78.2 cm(P<0.05)and 92.1 cm(P<0.05)respectively. It was indicated the form diet of LQM group and nutritional level were suited to skeleton development of calves at the age of 30 days. Though early-weaned had some effect on the development of calves before the age of 60 days, it was received the compensation for the development of calves at the age of 61~90 days to breed the same forms of diet and nutritional level. So it was feasible to practice the early-weaned technology to breed the calves in the north frigid zones.