Abstract
Hypophysectomy of bullfrog tadpoles, Rana catesbeiana, kept in low calcium and low sodium water caused significant hypocalcemia 1 week after the operation. Injections of tadpole pituitary homogenate (2 glands/animal/day) corrected the decrease in plasma calcium levels in hypophysectomized animals. Auto- or homotransplantation of the pituitary gland of the tadpoles tends to inhibit hypocalcemia after hypophysectomy. Furthermore, injection of a high dose of ovine or bovine prolactin (5 μg/g body weight in 5 μl) also partially restored the decrease in plasma calcium levels. A low dose of ovine prolactin (0.5 μg/g bw/5 μl) was ineffective. The pituitary gland is important in plasma calcium regulation of bullfrog tadpoles. Prolactin and possibly other pituitary hormones may participate in this regulation.
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