Abstract
White Leghorn female chicks were raised for 5 months with the diet to which mikamycin was added at the concentration of 1ppm and 10ppm, and the gonadotrophic potency of the anterior pituitary at 3, 4 and 5 months of age was measured by the chick assay method of NAKAJO and IMAI (1956).
The gonadotrophic potency at 4 months of age and at 5 months of age was significantly greater in the pullets on mikamycin than in the pullets without mikamycine. The dietary mikamycin may cause an increase in the secretion of gonadotrophic hormones from the anterior pituitary of chickens.
