STUDIES ON THE FREEMARTINS IN CAITLE
Xu Liren ,Shen Weiping ,Zhang Bingrong ,Mao Tianxiang(Nanjing Agricultural U niversity )
If the towin and the fetal is female and male in cattle ,the gonads of male fetal developed earlier thanfemale and secrcted androgens and MIF reached the female embryo by way of the vascular anastomosis in theplacenta and this inhibited the development of the female gonads and genital tract.So that the female heifer isinfertility. The ovaries usually fait to develop and remain small ,no follicle; The female reproductive organ such asuterine tube , uterus , cervix , vagina , vestibule and vulvar present absence or section hypoplasia;Prominont clitoris,large tuft of vulvar hair , some undifferentiation toward the seminal vesicle or male gonad;The chromosomes arewith XX , XY chimerism in the female; The level of Hormone is low and no charge. The diagnosis from history,many Symptoms and infertility and eliminate the freemartin’s animal is useful on the practise.
【CateGory Index】： S823.2