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By J. A. Clark

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Long-wave radiation is also important in the energy balance. In the tropics the intensity of solar radiation under clear skies is fairly uniform from place to place, and the duration of sunshine is a useful indicator of radiation load. There is evidence for significant increases in performance efficiency in these warm (dry) areas when shades or shelter are introduced into dry-lot feeding schemes. The benefits of shade provision may well be questionable, however, in hot, humid environments that are associated with low air movement, if the congregation of stock further restricts that air movement and hence evaporation and convection.

McK. (1972). The Stress of Hot Environments. Cambridge University Press, Cambridge KIBLER, H. H. and BRODY, S. (1954). Research Bulletin of the University of Missouri Agricultural Experiment Station, No. 552 KOPPEN, W. and GEIGER, R. (1936). Handbuch der Klimatologie, Vol. 1, Part C. Bornträger, Berlin LAMB, H. H. (1963). Symp. Changes Climate, Arid Zone Res. (Paris) 20, 125-150 LANDSBERG, H. E. (1972). ' WMO Tech. Note 123. World Meteorological Organization, Geneva LEE, D. H. K. (1958). Arid Zone 10,102-124 LIVESTOCK CONSERVATION INC.

Edinburgh SMITH, C. V. (1965). Unpublished agricultural memorandum No. 138 (available from Meteorological Office, Bracknell, Berkshire) SMITH, C. V. (1970). ' WMO Tech. Note 107. World Meteorological Organization, Geneva SMITH, C. V. (1971). ' WMO Tech. Note 122. World Meteorological Organization, Geneva SMITH, C. V. (1974). In Heat Loss from Animals and Man, pp. 345-366. Ed. by J. L. Monteith and L. E. Mount. Butterworths, London SMITH, L. P. andOLLERENSHAW, C. B. (1967). Agriculture, Lond. 74,256-260 STARR, J.

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