EVALUATION OF MULTIENZYME COMPLEX IN DIETS WITH INCREASING LEVELS OF WHEAT FOR LAYERS IN THE REARING PHASE.

F. B. FREITAS, I. ZANELLA, A. D. CARVALHO, M. R. RABER, B. S. BRUM JÚNIOR, J. F. SOUZA, S. S. FRANCO, A. P. ROSA

Abstract


The goal of this experiment was to determine how the addition of enzymes in diets with increasing levels of wheat affects the performance of Isa Brown laying hens in the rearing phases. The birds were evaluated for four 21-day periods (7th ? 18th week-of-age). A completely randomized design in a 4 x 2 factorial design was used to evaluate four levels of wheat (0, 16, 32 and 48%) with or without enzymes, being 6 replicates with 4 pullets each, and a total of 192 birds. The multienzyme complex was composed of cellulase, glucanase and xylanase. We evaluated the feed intake, body weight, uniformity, and first egg weight. The age of sexual maturity was significantly different in accordance with the levels of wheat, represented by a decreasing linear regression. No differences existed for the other variables according to the increasing levels of wheat. The enzymatic supplementation and the interaction among the factors were not significant. The performance of laying hens between 7th ? 18th week-of-age was not affected when they were fed diets with up to 48% of wheat. The supplementation of enzymes (cellulase, glucanase, xylanase) in wheat-based diets did not prove beneficial for laying hens in the inclusion levels we studied.
KEY -WORDS: Birds. Performance. Enzymes. Pullets. Rearing.



DOI: http://dx.doi.org/10.15361/2175-0106.2005v21n1p01-06