Efeito da idade dos frangos de corte sobre a atividade enzimática e digestibilidade dos nutrientes do farelo de soja e da soja integral
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Data
2004
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Resumo
This work aimed to investigate the effect of broilers age in the digestibility of nutrients in extruded and toasted full
fat soybean (EFFS and TFFS) and soybean meal plus oil (SMO), and in the production of digestive pancreatic enzymes. Five digestibility
assays were carried out with broilers of one, two, three, four , and six weeks of age. Total collected excreta methodology was applied.
The activities of amylase and pancreatic trypsin enzymes increased linearly with the broilers age, as well as the allometric growth of
the pancreas. The highest allometric growth ratio occurred in the second week, coincidentally with the period of increasing activity of
the digestive enzymes. However, for lipase activity, distinct age affect was found for each feeds. For birds fed on TFFS, the enzyme
activity increased linearly with age, while those fed on EFFS, SMO, and concentrate a quadratic effect was observed. The digestibility
coefficients for dry matter and ether extract and the soybeans metabolizable energy (ME) varied at different proportions by age. A positive
correlation between ether extract digestibility and lipase activity was also observed. The results of corrected apparent and actual
metabolizable energy for EFFS presented a quadratic profile in function of age, increasing ME up to the third week and decreasing after
this period. However, ME of TFFS, SMO and concentrate was not affected by chicks age. The nutrient digestibility of feedstuffs varies
with chicks age, due to the different enzymatic activities.
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Digestibilidade dos nutrientes, Enzimas pancreáticas, Soja integral processada, Nutrient digestibility, Pancreatic enzyme, Processed soybean
Citação
SAKOMURA, Nilva Kazue; DEL BIANCHI, Margarete; PIZAURO JR., João Martins; CAFÉ, Marcos Barcellos; FREITAS, Ednardo Rodrigues. Efeito da idade dos frangos de corte sobre a atividade enzimática e digestibilidade dos nutrientes do farelo de soja e da soja integral. Revista Brasileira de Zootecnia, Viçosa, v. 33, n. 4, p. 924-935, 2004.