不同剂量烯丙孕素对后备母猪同期化发情、体质量及繁殖性能的影响

为了探究不同剂量的烯丙孕素对后备母猪同期化发情、体质量及繁殖性能的影响,试验选取150头后备母猪,随机均分为5个试验组,每组饲喂0,10,15,20,25 mg/(d ?头)的烯丙孕素口服液.结果显示,在口服烯丙孕素15 mg/(d ?头)的剂量时,母猪的同期发情率最高为96.67％,受配率、受胎率及分娩率均为100....

Effects of different doses of altrenogest on synchronous estrus,body mass and reproductive performance of reserve sows

To investigate the effects of different doses of altrenogest on the synchronization of oestrus,body mass and reproductive performance of replacement gilts,150 replacement gilts were randomly divided into 5 groups,each gilt in the groups were orally fed with 0,10,15,20 and 25 mg/d of altrenogest.The results showed that the highest rate of synchronization of oestrus was 96.67%and the rate of mating,conception and delivery were 100.00%in replacement gilts supplied with 15 mg/d of altrenogest.With 20 mg/d of altrenogest,the proportion of sows with oestrus on the 6 th and 7 th day was the highest,which was 70.37%(19/27).The added body mass(11.67 kg)of each sow,the number of healthy infant piglets(n=11.17)and effective infant piglets(n=11.67)were all the highest in the experimental group,but there was no significant difference(P>0.05)in all indexes of body mass and reproductivity.These results indicated that synchronization of oestrus can be best acquired by taking in 15 mg/d of altrenogest with regular feeding when the replacement gilts are in the farrowing pens.In addition,the reproductivity can be effectively maintained by taking in 20 mg/d of altrenogest.