4Head H H,Chakriyarat S,Thatcher W W,et al.Induction of lactation:Comparison of injections of Estradiol-17β and Progesterone for 7 or 21 days on prolactin response to thyrotropin releasing hormone and milk yield in dairy cattle[J].J Dairy Sci,1982,65(6):927-936.
5Jordan D L,Erb R E,Malven P V,et al.Artificial induction of lactation in cattle:Effect of modified treatments on milk yield,fertility,and hormones in blood plasma and milk[J].Theriogenology,1981,16(3):315-329.
6Collier R J,Davis S R.Induction of lactation in cattle.In Current Therapy in Theriogenology[M].London:W B Saunders Co,1986:379-382.