The Effect Of Timed Artificial Insemination On The Reproductive Performance Of Gilts

The gilt’s Timed Artificial Insemination is an important prerequisite for the realization of batch production of gilts.Timed Artificial Insemination can reduce the estrus identification workload and increase the estrus rate,and even direct insemination without estrus identification,thereby increasing sow utilization and establishing a precise breeding program In order to improve the sow utilization rate and accurate formulation of AI programs,this study compared the gilt estrus rate,return rate,conception rate,artificial insemination rate,artificial insemination concentration,and total litter size of the gilts by six different insemination procedures.The indexes of fetal weight,average weight,and other indexes affect the selection of the most appropriate insemination procedure for sows.The insemination procedures are: TAI group,FTAI group,FG600 + TAI group,FG600+ FTAI group,and two control groups 1 and 2 groups were inseminated by traditional insemination.At the same time,the gilts were fed with Chinese herb additives mainly composed of rehmannia and hawthorn meat to reduce the effect of PRRS on gilt breeding.The blue-ear antibody level and serum immunoglobulin after the administration of Chinese herbal additives were measured.The content measures the effect of Chinese herbal medicine on gilts.The main results of this study are as follows:(1)The artificial insemination time of the FTAI group,FG600 + FTAI group was all 6 days after the cessation of altrenogest,and the TAI group,FG600 + TAI the group’s artificial insemination time was focused on the 5th,6th,and 7th days after the withdrawal of altrenogest,the FTAI group,the FG600+ FTAI group,the TAI group,and the FG600+ TAI group the rate of artificial insemination was 90.3%,95.5%,79.9%,and 77.9% within one week after withdrawal of altrenogest.There was a significant difference(P<0.05)in the artificial insemination within one week after withdrawal of altrenogest in the FTAI group and the TAI group(P<0.05).FG600+ FTAI group and FG600+TAI there was a significant difference in the artificial insemination rate within one week after cessation of altrenogest treatment(P<0.05).(2)The parturition rate(95.8%)in FG600+TAI group was significantly higher than that in control group 1(80.4%)(P<0.05).The parturition rate(90.5%)of FG600+FTAI group was significantly higher than that of control group 1(80.4%)(P<0.05).The parturition rate(90.5%)of FG600+ FTAI group was significantly higher than the parturition rate of 69.0%(P<0.05)in the FTAI group.The rate of parturition and giving in the TAI group(88.7%)was significantly higher than that of the FTAI group(69.0%)(P<0.05).The rate of parturition of the control group 2(88.2%)was significantly higher than the rate of parturition(69.0%)of the FTAI group(P<0.05).(3)Total litter size of FTAI group,control group 1,TAI group,FG600+ TAI group,FG600+ FTAI group,and control group 2 they were 12.76,12.17,11.78,11.74,11.70 and 10.87 respectively.The total number of fetuses in the FTAI group was significantly higher than that in the control group 2(P<0.05),and there was no significant difference in the total number of fetuses in the other groups(P> 0.05).(4)The number of gilts of natural estrus before 200 days of age was significantly higher than that of gilts without natural estrus before 200 days of age(P<0.05).(5)There was no significant difference in the blue-ear antibody level between the test group fed with the Chinese herbal additive and the control group(P>0.05).The levels of the serum immunoglobulin Ig G,Ig A and Ig M were higher in the test group than in the control group,but the difference was not significant(P>0.05).