1LAUDERDALE J W. Effects of PGF2α on pregnancy and estrous cycle of cattle[ J ]. J Anim Sci, 1972, 35 (1) :246.
2O' CALLAGHAN D, YAAKUB H, HYTTEL P, et al. Effect of nutrition and superovulation on oocyte morphology, follicular fluid composition and systemic hormone concentrations in ewes [ J ]. J Reprod Fertil,2000,118 ( 2 ) : 303 - 313.
3XU Z Z, BURRON L J. Estrus synchronization of lactating dairy cow with GnRH, progesterone, and prostaglandin F2α[ J ]. J Dairy Sci,2000,83 ( 3 ) : 471 -476.