Abstract
The responses of young and mature wethers to different cooling/housing environments were studied. In the first trial, 180 wether lambs were housed in closed or open pens. In the second, both young and mature wethers (60 of each) were housed in conventional feedlot sheep pens. Micromist cooling was installed in both types of shed. Although mist cooling considerably reduced ambient temperatures in open and closed animal pens, there was no significant improvement in live weight gains in lambs in the first experiment. Mist cooling in conventional sheep sheds resulted in a significant improvement in live weight gains. The young wethers were found to be more sensitive to heat stress than the mature.
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