Effects of neonatal olfactory bulbectomy on the food intake, water drinking and thyroid glands in male chickens.

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In order to investigate the possibility that neonatally olfactory bulbectomized chickens can increase the food intake, as seen in adult anosmic chickens, newly hatched male White Leghorn chicks were bulbectomized within 24 hours after hatch and food intake, water drinking, body weight and thyroid glands were periodically examined from 15-day to 130-day old. Anosmic chickens showed no changes in the food intake and body weight. Besides, thyroid glands of operated chickens showed no marked morphological alterations except that some comparatively developed simple cuboidal epitheliums were more frequently observed among simple squamous ones than those of controls. The marked hyperphagia and activated follicles in the thyroid glands seen in the adult anosmic chickens were not demonstrated in this study. Whereas, unexpected decrease of the water drinking was observed in bulbectomized birds.These findings suggest that an interaction between the olfactory bulb and the thyroid gland is not completely established during the early days of life in chickens and that the olfactory bulb might play an important role in guiding the water drinking behaviors.
日本家禽学会の論文