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Summary. Hypophysectomized hens and hens treated with a pituitaryinhibiting drug were injected with a partially purified preparation of avian pituitary glands. Ovarian weight and follicle size were measured, and also oviduct weight as an indicator of ovarian endocrine activity. Thyroid stimulation was detected by a histological study. It was demonstrated that the preparation used contained all or most of the gonadotrophin and thyrotrophin activity of the original acetone-dried material.
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Margaret E. Mitchell (1967) studied this question.
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