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The concentrations of prolactin and LH were measured in the plasma of male and female ring doves (Streptopelia risoria) during the breeding cycle. Prolactin concentrations were low during courtship and early incubation but increased markedly (P less than 0.01 in both sexes) between days 7 and 15 of incubation, during the period of rapid growth of the crop(More)
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