The effects of dietary protein, carbohydrate, fat and fibre on the net availability of metabolizable energy in the chick
1980
Scheele, C.W. | Guillaume, J. | Kussaibati, R. (Instituut voor Pluimveeonderzoek 'Het Spelderholt', Beekbergen (Netherlands))
Four balance experiments were carried out on 768 male chicks of 1-4 weeks of age to measure the net energy (NE) value of diets with different levels and kinds of protein, fat, carbohydrate and fibre. The 18 diets were fed at three levels to birds individually caged in a controlled-environment chamber. The comparative slaughter technique was used. The availability of metabolizable energy (ME) for maintenance was lower for proteins, irrespective of amino-acid balance, and for fats. The availability of ME for growth, unaffected by protein, was clearly higher for saturated fats and seemed lower for high pentosane or high fibre diets. Unsaturated fats appeared less efficient. The effect of fibre seems to be due to an interaction of the feeding level with the digestibility of nutrients. Considerable data have been published concerning the net availability of protein fat and carbohydrate in the growing chick (cf. de Groote, 1974). However, few studies of the effect of the nature of protein, fat or carbohydrates have been made. The effect of fibre found by Petersen (1973) also remains unexplained. For this reason four experiments were carried out.
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