Sows timed insemination and batch to batch management in North American
With the development of Altrenogest MATRIX,gonadotropins OvuGel and other hormonal drugs,the sow's synchronous estrus ovulation,fixed-time artificial insemination,induced farrowing synchronization and other breeding techniques in North American farms can be achieved,making the sow reproduction cycle range from one week to three or four weeks.This batch to batch management of sow which can improve sow reproduction performance and makes producers organize labor and material inputs more effective,enables employees weekend off.Through those reproduction technologies practice,some of farms in North America have formed a new management system.The paper reviews the application of hormone drugs in batch management in North American farms,the advantages and disadvantages in different methods of insemination,the use of hormonal drugs in induced farrowing,which is worth the Chinese pork industry managers and researchers learning from it.