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Histological changes occurring in the pituitaries and ovaries of normal cows during the estrous cycles have been described. Changes in the testes, adrenals, pituitaries, and ovaries were found in animals with lowered fertility. These changes indicate that the lowered fertility is associated with several different conditions in the different organs and the animals have been tentatively placed in groups according to histological conditions found.
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Cupps et al. (1959) studied this question.
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