Bioquímica sanguínea e biometria óssea de frangos de corte alimentados com quirera de soja

Abstract

The objective of this study was to evaluate the effect of increasing levels of soybeans in substitution to soybean meal, with and without protease on the correlation of the minerals biochemical profile and bone biometry of tibia and femur in broilers. A total of 500 birds of the Cobb® line fed with levels of 0, 3, 6, 9 and 12% of soybean and protease were used during the 42-day experimental period. The design was completely randomized, with ten treatments and five repetitions containing ten birds per repetition. The treatments consisted of replacing soybean meal by grind whole soybean, with and without the addition of the protease enzyme in diets based on corn and soybean meal. The levels of calcium (Ca), phosphorus (P) and alkaline phosphatase (FA) in the blood were determined as well as the analysis of the tibia and femur biometrics and their correlations over the seven, 14, 21 and 42 days of age. The results were submitted to analysis of variance by the R program when the F test was significant, polynomial regression analysis was applied, at 5% probability. The levels of grind whole soybean significantly affected (p <0.05) both the blood concentrations of calcium and phosphorus and the weight of the tibia and femur for all growth phases. It was concluded that the use of up to 3% of the grind whole soybean replacing soybean meal in broiler chickens can be used without causing problems in the absorption of calcium and phosphorus. However, from 6% of soybeans, there was a negative influence, confirmed by the serum alterations of minerals and by the increase in alkaline phosphatase, indicating that there was bone remodeling. The Seedor index showed a significant reduction with increasing levels of grind whole soybean, which leads to a reduction in bone density producing fragile bones, generating locomotor problems and consequent economic losses in production.