Étude cytogénétique sur certaines races bovines italiennes en voie de diminution ou menacées de disparition

Abstract

polyploid cells, but the normal pattern of inheritance of plasma transferrin types from both parents did not indicate either digyny or dispermy. Triploidy has not therefore been shown. It is likely that the XY lymphocytes were of fraternal origin. The external genitalia resembled those of some other cows with disgenic gonads and absence of Wolffian or penile structures (L OJD A, r968; RIEC K, 1973 ). They also had elongated urethrae. Their vestigial gonads had tunical albugineae, evidence of early testicular development. It is suggested that these cases, and possibly the present one, demonstrate the earliest stage of masculinization of the genitalia, in which only the genital sinus is stimulated to form an elongated, male urethra. The gonads then degenerated before the Wolffian system could be stimulated. In the classic freemartin the earliest stage is missing, but the fraternal stimulus provokes testicular development in a second stage while the Wolffian structures are still sensitive. Neither the ani-

DOI: 10.1186/1297-9686-9-4-534A

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@inproceedings{Molteni1977tudeCS, title={{\'E}tude cytog{\'e}n{\'e}tique sur certaines races bovines italiennes en voie de diminution ou menac{\'e}es de disparition}, author={Luciano Molteni and Giancarlo Succi and Annamaria de Giovanni}, booktitle={Genetics Selection Evolution}, year={1977} }