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Ranchers.net

this just kinda popped into my head yesterday checking cows,i wonder if breeding cows to certain bulls makes them more aggresive or less agressive after calving,the reason being is i noticed some cows that have been mellow seem to be more aggresive this year and some that were aggresive other years are more mellow,i am not talking breeds ,just wondering if the bull has any effect on the hormone level of the cow,any studies been done on this?
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