Effect of age on enzyme activity and nutrients digestibility for broilers fed soybean meal and full fat soybean

Revista Brasileira de Zootecnia

Del Bianchi, Margarete¹  Pizauro Jr., João Martins⁵  Sakomura, Nilva Kazue⁴  Freitas, Ednardo Rodrigues³  Café, Marcos Barcelos² 

[1] Faculdade de Agronomia 'Manoel Carlos Gonçalves', Pinhal;Universidade Federal de Goiás - Goiânia, Goiânia;Universidade Estadual Paulista;Univesidade Estadual Paulista, Jaboticabal;Universidade Estadual Paulista, Jaboticabal

关键词: nutrient digestibility;    pancreatic enzyme;    processed soybean    Introdução O uso de rações com alta densidade energética tornou-se comum tanto na avicultura de corte quanto na de postura em função das exigências nutricionais de aves mais produtivas;   

DOI  :  10.1590/S1516-35982004000400013

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

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.

【 授权许可】

CC BY-NC