7Bari F.,Khalid M.,Harasign W.,et al.Effect of mating system,flushing procedure,progesterone dose and donor ewe age on the yield and quality of embryos within a MOET program in sheep.Theriogenology,2000,53 (3):727～ 742
9Scudamore CL.,Robiinson JJ.,Aitken RP..The effect of timing of laparoscopic insemination in superovulated ewes,with or without sedation,on the recovery of embryos,their stage of development and subsequent viability.Theriogenology,1991,35 (5):907～ 912
