J. Anim Sci.
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J. Anim Sci. 1972. 35:624-627.
© 1972 American Society of Animal Science
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Physical Principles of Energy Exchange1

S. R. Morrison2

University of California, Davis 95616

Abstract

Heat transfer laws derived for inanimate objects apply to animals, but the complex shape of animals makes specific empirical equations necessary. Radiation and convection heat equations ordinarily have surface temperature as one of the variables, yet animal surface temperature itself is a function of air temperature, wind velocity and incoming radiation so use of equations is difficult. Evaporation is primarily controlled by the animal, thus usual equations for evaporation from a free water surface can not be used except for animals with wet surfaces. The different modes of heat transfer under outdoor conditions are illustrated by experimental data.

Footnotes

1 Presented at the Symposium on Influence of Environment on Nutrient Requirements of Animals, at the Annual Meeting of the American Society of Animal Science, Davis, California, August 2, 1971. Cosponsored by the Committee on Animal Nutrition, National Research Council.

2 Associate Professor of Agricultural Engineering.






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