INCIDENCE OF TWINNING AND FREEMARTINISM IN FRIESIAN CATTLE WITH HISTOPATHOLOGICAL STUDIES OF THE FREEMARTIN GENITALIA

Document Type : Research article

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Abstract

The data of 2971 calvings including 41 twin calving were studies for the incidence of twinning and freemartinism in Friesian dairy herds. The overall incidence of twinning was 1.38% with 0.76% homosexual and 0.64% heterosexual. An incidence of 94.7% of females that borne co-twin with males were freemartins "Sterile". In such cases, the gonads were small and undifferentiated. The gonadal histopathological structures were mainly stromal connective tissue and aggregated large cells. The uterus was small without cervix and the vagina was blind. Two pairs of vesicular glands were always present, they consists of small alveoli lined by cuboidal epithelium. The body weights of single borne calves were significantly higher (P<0.001) than twins at parturation.

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Assiut Veterinary Medical Journal
Volume 32.1, Issue 63
October 1994
Pages 198-208

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