2J E Larson,G C Lamb,J S Stevenson,et al.Synchronization of estrus in suckled beef cows for detected estrus and artificial insemination and timed artificial insemination using gonadotropin-releasing hormone,prostaglandin F2αand progesterone[J].J Anim Sci 2006,84:332-342.
3J F Bader,F N Kojima,D J Schafer,et al.A comparison of rogestin-based protocols to synchronize ovulation and facilitate fixed-time artificial insemination in postpartum beef cows[J].J Anim Sci,2005,83:136-143.
4Lemaster J W,J V Yelich,J R Kempfer,et al.Effectiveness of GnRH plus prostaglandin F2α for estrus synchronization in cattle of Bos indicus breeding[J].J Anim Sci,2001,79:309-316.
5Hiers E A,C R Barthle,Mk V Dahms,et al.Synchronization of Bos indicus×Bos taurus cows for timed artificial insemination using gonadotropin-releasing hormone plus prostaglandin F2α in combination with melengestrol acetate[J].J Anim Sci,2003,81:830-835.
6Michael J Rathbonea,Keith L Macmillanb,Keith Inskeepc,et al.Fertility regulation in cattle[J].Journal of Controlled Release,1998,54(2):117-148.
