CHANGES in egg size, egg production and body weight of domestic fowl are influenced by seasonal fluctuations. It is also known that environmental temperature plays an important role in regulating thyroid activity. Maqsood and Reineke (1950) reported that thyroid activity in mice is determined principally by temperature regulating capacity. Surrounding air temperature is one of the primary factors influencing thyroid stimulating hormone (TSH) output which in turn governs thyroxine elaboration by the thyroid. Thyroxine in turn controls the rate of metabolism of the organism. Ring (1939), using rats attributed the increase in metabolic rate, which followed exposure to cold, to increased thyroid activity. Low temperatures result in an increase, and high temperatures in a decrease of TSH elaboration. Dempsey and Astwood (1943) measured TSH secretion rate by noting the rate of thyroid enlargement in rats fed graded doses of thiouracil. Rate and degree of thyroid enlargement in rats maintained at …
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Huston et al. (1962) studied this question.
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