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<blockquote data-quote="Anonymous" data-source="post: 9133"><p>Male embryos produce MDIH, Mullerian duct inhibiting hormone, which prevents the formation of internal female anatomy as the female is the default sex. The common blood supply shared by male and female calves in the case of twins means that the female is exposed to this hormone as well. The heifer's reproductive tract does not develop completely with "blind" tracts and incomplete canalization. Ovaries cease to grow and do not develop appropriate germ cells. Therefore, the ovaries are incapable of producing estrogen and often produce testosterone in substantial amounts. This explains why freemartin heifers often exhibit "bullish" behaviors.</p><p></p><p> <a href="mailto:arhoward99@yahoo.com">arhoward99@yahoo.com</a></p></blockquote><p></p>
[QUOTE="Anonymous, post: 9133"] Male embryos produce MDIH, Mullerian duct inhibiting hormone, which prevents the formation of internal female anatomy as the female is the default sex. The common blood supply shared by male and female calves in the case of twins means that the female is exposed to this hormone as well. The heifer's reproductive tract does not develop completely with "blind" tracts and incomplete canalization. Ovaries cease to grow and do not develop appropriate germ cells. Therefore, the ovaries are incapable of producing estrogen and often produce testosterone in substantial amounts. This explains why freemartin heifers often exhibit "bullish" behaviors. [email=arhoward99@yahoo.com]arhoward99@yahoo.com[/email] [/QUOTE]
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