4NEGLIA G,GASPARRINI B,DI PALO R,et al.Comparision of preganancy rates with two estous synchronization protocols in Italian Miditernean Buffalo cows[J].Theriogenology,2003,60:125-133.
5ALVAREZ R H,MEIRELLES C,AMBROSANO G,et al.The use of lower doses of the prostaglandin analogue,cloprostenol,for oestrus synchronization in heifers[J].Animal Reproduction Science,1991,25(2):93-96.
