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Abstract
CONSIDERABLE evidence is now available to show that the thyroid hormone is implicated in the development and normal function of the testis. A comprehensive review of this topic has been published recently by Maqsood (1952).Most investigators agree that in the domestic fowl hypothyroidism, produced by either thyroidectomy or goitrogen administration, results in testicular regression and hypofunction.Benoit and Aron (1934) reported that thyroidectomy delayed testicular development in White Leghorn cockerels. Reduction in testis size together with impairment or cessation of spermatogenesis in male birds was reported by Greenwood and Chu (1939), Blivaiss and Domm (1942) and Payne (1944). No spermatogenic stages beyond secondary spermatocytes were found in thyroidectomized cocks up to 22 months of age (Blivaiss, 1947).Similar findings have been reported with goitrogens although results appear to vary with the dosage level, duration of treatment and age of the birds. No significant change was noted by Schultze and …
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