不同阶段犊牛免疫牛病毒性腹泻灭活疫苗的效果研究OA

The prevention and control of bovine viral diarrhea virus(BVDV)has been emphasized by more and more ranches,but the immunization procedures are different,and the use of the effect varies greatly.At present,there are three main types of immunization:the first type,the first vaccine immunization immediately after the birth of calves,and then feed colostrum,21 days after the strengthening of immunization once;the second type,30～40 days old calves first immunization,21 days after the strengthening of immunization once;the third type,90～120 days old calves first immunization,21 days after the strengthening of immunization once;immunization dose are 2 ml/head.In order to evaluate the effect of the three types of immunization,this comparative effect analysis test was conducted.Each immunization group in the strengthening immunization 30 days after the blood for neutralizing antibody potency test,the results show that 90～120 days of age for the first immunization is the best effect,20 calves of the protection rate of 100%,the effect of immunization is excellent;according to the results suggest that the ranch according to the actual situation,calves are best used around 90 days of age for the first immunization.