Abstract
Summary Young bulls and one aged bull reacted differently to thiouracil-induced hypothyroidism. Physical symptoms of thyroid deficiency were produced in both the young and aged bull fed thiouracil. Changes in seminal characteristics were observed only in the aged bull, in which an increase in abnormal sperm and dead sperm, as well as a reduction in sperm motility, livability, and concentration occurred. Natural recovery followed about 6 weeks after thiouracil was withdrawn. It was shown that thiouracil did not have a harmful effect upon normal ejaculated sperm and that thyroxine did not stimulate motility and livability of sperm from the hypothyroid bulls.
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