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The effects of restricting enzyme supplementation in wheat-based diets to broilers
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Orientador(es)
Resumo(s)
The performance of broilers fed on xylanase supplemented diets for part or all of the production
cycle was evaluated in two experiments. In a preliminary experiment, 1-day-old
chicks were fed a wheat-based diet supplemented with a commercial xylanase for the entire
duration of the experiment of 28 days, or during the last 21, 14, or 7 days of the trial. In
experiment 2, the growth period was extended to 36 days, and birds were fed xylanase supplemented
diets for the entire duration of the experiment, or during the last 27, 18, or 9 days
of the trial. In both experiments, an additional group was fed a non-supplemented control
diet. Xylanase-supplemented broilers outperformed non-supplemented birds. Significant
differences in body weight emerged at 21–28 days of age, suggesting that the response to
xylanase supplementation occurs primarily during the latter stages of broiler growth. Broilers
fed xylanase-supplemented diets for the entire experiment presented similar growth
performance, intestinal viscosity, gastrointestinal enzyme activity and organ sizes when
compared with birds supplemented with the exogenous xylanase for the last 14 (experiment
1) or the last 18 days (experiment 2) of the trials. Birds exposed to exogenous xylanase
for the entire duration of the experiment showed, however, a non-significant trend (P<0.1)
towards an improved final body weight and feed conversion ratio. Nevertheless, it appears
that an early exposure to the exogenous xylanase is of marginal importance in obtaining a
significant response to xylanase supplementation by broilers fed wheat-based diets
Descrição
Palavras-chave
broiler enzyme wheat xylanase
Contexto Educativo
Citação
"Animal Feed Science and Technology". ISSN 0377-8401. 172 (2012) p. 194-200