Abstract
SUMMARY The free thyroxine index (FT4), free tri-iodothyronine index (FT3), thyroxine (T4)/tri-iodothyronine (T3) ratio, serum cholesterol, total plasma protein (TPP) concentration, packed cell volume (PCV), rectal temperature and feed intake were determined in six adult Letelle wethers exposed to a hot-humid, a hot-dry and a cool-dry environment. The temperature-humidity index (THI) was used to determine the combined effect of ambient temperature and humidity on the values measured. Values measured during the hot environments were compared with those measured during cool-dry exposure. During the first week of the hothumid exposure mean FT3 values increased 20·6% (P The results suggested that an increase in thyroid hormone-binding capacity increased thyroid hormone concentration during the initial phases of exposure to the hot-humid environment, whereas prolonged exposure to the same environment depressed T3 values. Exposure to a hot-but-dry environment did not change thyroid hormone concentration. The changes in feed intake and blood cholesterol values were not related to thyroid hormone concentration.
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