Author
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Hahn, George |
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Submitted to: Meeting Abstract
Publication Type: Proceedings Publication Acceptance Date: 7/1/1996 Publication Date: N/A Citation: N/A Interpretive Summary: Heat waves reduce feed intake and performance of ad-lib-fed feedlot cattle, and sometimes cause death of vulnerable animals. Recent research results provide knowledge of shorter-term, dynamic responses of feeder cattle to the onset of heat. These results emphasize the importance of acute and adaptive phases of exposure, and the influence of prior conditioning to heat. Use of this knowledge to limit the impact of heat waves is dependent on the feedlot manager to recognize potential vulnerability of his animals in the context of forecast conditions, and to act accordingly. Forecasts are valuable only to the extent that they influence decisions. Technical Abstract: Heat waves reduce feed intake and performance of ad-lib-fed feedlot cattle, and sometimes cause death of vulnerable animals. Recent research results provide information about the dynamic responses of feeder cattle to the onset of heat, which can be useful in environmental management decisions during hot weather. Details of these results are discussed in relation to heat waves (using specific examples from 1992 and 1995), illustrating how hot weather alters feeding time and reduces feed intake as cattle attempt to maintain homeothermy by balancing heat production with heat dissipation capabilities. The importance of acute and adaptive phases of response are emphasized, as well as the influence of prior conditioning to heat. Use of this knowledge to limit the impact of heat waves is dependent on the feedlot manager to recognize potential vulnerability of his animals in the context of forecast conditions, and to act accordingly. Forecasts are valuable only to the extent that they influence decisions. |
