Abstract:Serum immunoglobulin (IgG) was measured after 48 hours of colostrum feeding. If it was more than 10mg/ml, it indicated that calves had better immunity. To investigate the effect of colostrum supply on passive immune transfer (TPI) in newborn calves, 72 newborn calves were selected to conduct a controlled feeding experiment with colostrum feeding time period, feeding amount, feeding mode and colostrum quality as variables, to analyze the effect of colostrum control supply on TPI acquisition in newborn calves. The results showed that, under the premise of feeding high quality colostrum, good IgG levels could be obtained at 1 ~ 2 h after calves were born, at 10% of calves" body weight colostrum, in pasteurized colostrum (LTLT) and in milk bottles, igG reached 13.53 mg/ml, 14.76 mg/ml, 20.39 mg/ml, 14.97 mg/ml respectively, all of which exceeded 10mg/ml. The IgG value reached 21.07 mg/ml after inputting the above four variables, which indicated that the control colostrum supply had a significant effect on TPI acquisition in newborn calves.
