8Jordanov J,Angelova P. Effect of steroid sex hormones on chick embryo gonads in organ culture with special reference to hormonal control of gonadal sex differentiation[J]. Reprod Nutri Develop, 1984,24:221-223.
9Ottinger M A. Sexual differentiation of neuroendovrine systems and behavior[J]. Poul Sei, 1989,68 : 979 - 989.
10Shoffner R N. Sex determination of brids cytogenetics of livestocked by eldridge. F. E. AVI Publishing Company INC, West port,1985,270.