Dry Residue of Cassava Associated With Carbohydrases in Diets for Broiler Chickens

Abstract

SUMMARY: The objective of this study was to evaluate the inclusion of dry residue of cassava (DRC) with or without carbohydrases on broilers from 22 to 42 d of age. The treatments consisted of a combination of diets containing 5 levels of inclusion of DRC (0, 2.5, 5.0, 7.5, and 10.0%), with or without carbohydrase enzymes combination supplementation. There was an interaction (P < 0.05) between carbohydrases and DRC for feed conversion ratio (FCR). Birds fed diets without carbohydrase supplementation had a linear increase (P < 0.05) in FCR with higher inclusion of DRC in the diets. There was an interaction (P < 0.05) observed between the enzyme supplementation and DRC for breast yield. There was a linear reduction (P < 0.05) in the relative weight of the gizzard with the increasing inclusion of DRC. There was a linear increase (P < 0.05) in the relative weight of the small intestine and the effect of carbohydrase supplementation. There was a significant effect (P < 0.05) of carbohydrase on plasma creatinine and gamma glutamyltransferase concentration. A linear reduction (P < 0.05) was observed for the b* variable during colorimetric analysis of the breast meat and feet of broilers fed higher inclusions of DRC. A significant quadratic effect (P < 0.05) was observed for water retention capacity with increasing levels of DRC. It can be concluded that up to 10% of DRC can be used in broiler diets from 21 to 42 d of age, when associated with carbohydrase for performance maintenance.

Keywords

• dietary fiber
• enzyme
• feedstuffs
• performance
• poultry