Abstract
IT HAS been shown that the thyroid hormone secretion rate (TSR) of fowls is significantly lower during summer months than during winter months (Turner, 1948; Stahl and Turner, 1961). The rate of uptake and release of thyroidal-I131 has been shown to be stimulated by short term exposure of fowls to 4.4°C. However, these rates were shown to return to normal by longer term exposure to 4.4° C. (Hendrich and Turner, 1963). The thyroid stimulating hormone secretion rate (TSH-SR) of fowls has been shown to be increased by cooler as compared to warmer environmental temperatures (Hendrich and Turner, 1964).The biological half-life (t 1/2) of thyroxine-I131 (L-T4-I131) refers to the time required for the disappearance of one-half of the hormone present in the blood at a given time. The purpose of the following research was to compare the effects of environmental temperature changes and a 4.4°C. temperature on the t 1/2 …
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