Abstract
AbstractAn experiment was designed to determine the relative effects of environmental heat stress and accompanying decline in voluntary feed intake on plasma thyroxine. The sheep were divided into three groups of four animals each. The control animals and feedrestricted group were maintained at thermoneutrality (22°, 50% RH). The heat group was maintained at 35° and 67% RH. All groups were fed ad libitum except the feed-restricted group which was fed at the level of the heat-stressed group. Results indicated that environmental heat has both a direct temperature and an indirect temperature (feed) effect on plasma thyroxine (T4). The feed effect was determined by comparing the plasma T4 of the feed-restricted group at 22° to the high-temperature (35°) group. Both groups consumed similar levels of feed. The heat-stressed group with elevated temperature and feed intake similar to feed-restricted group at thermoneutral showed significantly greater reduction of plasma T4. Therefore the temperature effect was ad...
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