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Asian Journal of Animal and Veterinary Advances
  Year: 2007 | Volume: 2 | Issue: 4 | Page No.: 223-228
DOI: 10.3923/ajava.2007.223.228
 
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Study of Fetal Sex Determination Based on External Genitalia and Gonadal Diferentiation in the Water Buffaloes of Iran
R. Ranjbar, S.H. Rashidi, N. Alboghobeish, R.A. Sadrkhanloo and Y. Mazaheri

Abstract:
This study was Performed on 102 embryos and fetuses that collected from Ahvaz slaughter house. The specimens was divided in three group, on the basis of external genitalia differentiation and Crown Rump Length (CRL), as groups 1, 2 and 3. The embryos of group 1 (No. 63, CRL-10-83 cm) showed completely developed external gentalia of male and female, so there was no doubts in the recognition of their sexes. The embryos of group 2 (No. 19, CRL-4-10 cm) also showed clear sex on the basis of genital tubercle (clitoris in the female and penis in the male embryos) and genital swellings (lips of vulva in the females and scrotom in the males). The tip of genial tubercle of females embryos have showed dorso-caudally and of males ventro-cranially directions, respectively. In the embryos of group 3 (No. 20, CRL = 0.38-4 cm). The determination of sex was not possible by help of external genitalia. So, the gonads of these embryos, were removed from abdominal cavity and after histological preparations, stained by H and E and PAS methods. On the basis of histological studies, sex differentiation of gonads to testis and ovary was recognized in embryos with CRL = 2.1 cm and CRL = 2.3 cm, respectively. Also the gonads of embryos lesser than CRL = 2.1 cm, recognized as undifferentiated gonads. These findings indicated that, sex differentiation in the level of gonads start sooner than external genitalia and also the differentiation of sex in male embryos has priority to female embryos. In addition, the embryos show an undifferentiated stage, that is impossible to recognize the sex of embryos neither on the basis of external genital nor gonadal histological structure.
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How to cite this article:

R. Ranjbar, S.H. Rashidi, N. Alboghobeish, R.A. Sadrkhanloo and Y. Mazaheri, 2007. Study of Fetal Sex Determination Based on External Genitalia and Gonadal Diferentiation in the Water Buffaloes of Iran. Asian Journal of Animal and Veterinary Advances, 2: 223-228.

DOI: 10.3923/ajava.2007.223.228

URL: https://scialert.net/abstract/?doi=ajava.2007.223.228

 
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