Desempenho e resposta imune de frangos de corte alimentados com dietas suplementadas com cromo na forma orgânica

Abstract

This study was conducted to evaluate the effect of adding organic chromium dietary supplementation on performance, digestive and lymphoid organs biometry and histomorphometry of the clocal bursa and on carcass and prime cuts performance of broilers from 1 to 41 days old, naturally stressed by heat cyclic. We used 400 chicks Cobb, the experimental design adopted was a completely randomized, with five treatments: 0; 350; 700; 1050 and 1400 ppb chromium in diet. The supplementation with organic chromium influenced (p<0,01) quadratic form on alimentary conversion the animals according to the equationY =1.67 to 0.00016x0.00000012x²(r²0.976) in the period 1 to 21. The levels of supplementation of organic chromium improvement productive efficiency and percentage of cortical parenchyma of broilers to 21 days. In phase to 1 from 41 days old, it was observed improvement the feathers weight with levels of organic chromium, and there wasn’t influence on performance of broilers. The chromium in the organic form improves the performance of broiler chickens and immune response by broiler chickens in cyclic heat stress.