Efeito do nível de ingestão sobre a digestibilidade dos aminoácidos em frangos de corte

Abstract

This paper were conducted with the objective of evaluation the effects of feed intake levels on the methodology of forced feeding of caecectomised broilers, on the coefficients of digestibility amino acids (apparent digestibility amino acids coefficients - ADCaa and true digestibility amino acids coefficients - TDCaa), using as feeds tests the wheat and some of its products. The feeds were randomly distributed in factorial outline of 2 x 8, (levels x feeds) with four repetitions. Seven wheat grain by-products were used. All broilers were submitted to a fast of 30 hours and forced to ingest 25 and 50 grams of the pure feeds ate the same time. In the two levels a treatment was left in fast, for the determination of the metabolic and endogenous losses. In the feeds and excrete, dry matter, crude protein and amino acids were analyzed. The means were compared by the test of SNK test. The values of DACaa over all treatments were affected for the amount of ingested feed, and in the lower intake level the values of DACaa were significantly lower (P,0,05). In the same way, TDCaa showed significant differences (P<0,05) among some treatments, indicating that the feed intake levels should be take in account since it had effect on the digestibility of AA of caecectomised broilers.