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Thyrotrophic hormone content of the pituitary of molting and laying hens was determined by the microhistometric method based on the increase in epithelial cell height of the thyroids of the recipient chicks, and the biochemical method based on the increase in P32 uptake by the thyroids of the recipient chicks. By either measurement thyrotrophic hormone content of the pituitary of laying hens was higher than that of the pituitary of molting hens, although no significant difference was observed between the two. Any evidence of the activation of pituitary-thyroid system was not observed in molting period of the hen.

THYROTROPHIC HORMONE CONTENT OF THE PITUITARY OF MOLTING AND LAYING HENS