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THE INFLUENCE OF FORCE FEEDING AND OF PROTEIN SUPPLEMENTATION TO THE DIET ON THE METABOLISABLE ENERGY OF DIETS, DIGESTIBILITY OF NUTRIENTS, NITROGEN RETENTION AND DIGESTIVE ENZYMES OUTPUT IN GEESE

1973; Elsevier BV; Volume: 13; Issue: 3 Linguagem: Inglês

10.1051/rnd

1297-9708

I. Nir, Zafrira Nitsan, A. VAX,

Food composition and properties

In two balance experiments the effect of cooking corn, force feeding, and soya-bean meal supplementation on feed utilization, were investigated in geese.The process of cooking did not improve the metabolizable energy of the diet.The excess of food introduced into the gastrointestinal tract by force feeding was digested normally, and efficiently utilized when it attained up to 3 -4 times the maintenance level.When higher amounts were force-fed, a 10 p. 100 reduction in the apparent digestibility of dry matter and a 7 p.ioo reduction in the metabolizable energy were noted.Force feeding caused steatorrhoea and inhibited fat absorption almost completely.The retention of the corn protein was quite low and decreased to negative values in the course of force feeding.Force feeding was accompanied by a gradual increase in the water released in excreta, up to 25 -fold the amount excreted by the ad lib.-fed geese.The trypsin and chymotryp- sin output in excreta were correlated with the feed intake.Amylase output in excreta was not parallel to feed intake and was even reduced by surfeit feeding.Supplementation of the force-fed corn diet with soya-bean meal, improved the crude protein digestibility and retention ; it also caused a more pronounced increase in the amylase level than in the proteolytic enzymes.