Download Recent Developments in Pig Nutrition by D.J A. Cole and W. Haresign (Eds.) PDF

By D.J A. Cole and W. Haresign (Eds.)

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This has led to some confusion, particularly as 1976 sees the start of metrication for the feed industry, coupled with a move towards SI units. Since this will involve a change from calories to megajoules and pounds to kilogrammes a few comments will be made about these alternative units. 1 Partitioning of food energy within the animal purposes. The energy used for maintenance, together with that of the heat increment, is given off by the animal as total heat production. It is worth stating that the practical objective of any energy system is to enable us to predict the performances of animals from a knowledge of the foods fed together with the amounts eaten.

Anim. W. E. (1967). ' Anim. W. H. W. (1966). W. (1971a). Growth of pigs fed cool whey at two ambient temperatures. Anim. W. (1971b). ' Anim. W. (1973). ' Anim. W. (1974). ' Anim. W. and Breirem, K. (1973). ' Anim. W. D. (1975). ' Anim. W. R. (1974). ' Anim. W. and M c L e a n , N . R . (1977). ' Trans. L. (1965a). ' Res. vet. L. (1965b). G. C (1967). ''Can. anim. W. (1974). ' In Energy Metabolism of Farm Animals. Ed. H. R. Reichl. W. O. (1970). ' In Energy Metabolism of Farm Animab. Ed. by A. Schüren and C Wenk.

However the same factor may be beneficial to the pig which is finding difficulty in dissipating sufficient heat to a hot environment. Because the pig relies to a greater extent on evaporative heat loss at high temperatures, relative humidity becomes important under these conditions. Evidence on this aspect has been provided by Ingram (1965a) and Morrison, Bond and Heitman (1968) which suggests that at 30° C air temperature an increase of 18% in relative humidity (or approximately 3°C wet bulb) is equivalent to an increase of 1°C in air temperature with respect to the effects on heat losses.

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