Desempenho de frangos de corte provenientes de ovos incubados com diferentes níveis de gás carbônico

Abstract

The main aspects and the effects of CO2 levels in hatchability of day old chick was the aim of this study. The maintenance of correct levels of CO2 during all the incubation period has a benefit in the correct embryo development and growth. The study was divided in two parts: at hatchery the eggs were exposed to different levels of CO2 until Day 10 of embryo development. The experimental design was customized randomized in a factorial 2 x 4 with two breeds (Cobb 500 and Ross 308) and four levels of CO2 (4000 ppm, 6.000 ppm, 8.000 ppm e 10.000 ppm) with 8 treatments, 6 repetitions with 84 eggs each one. The second experiment was conducted to analyze the offspring performance with the same 8 treatments, 4 repetitions each one, in a total of 32 experimental units. There were 30 birds per pen. The best hatch was the 4000 ppm CO2 level and the worst was the 10000 ppm CO2 level. Cobb 500 offspring had better weight than Ross 308 at hatch moment. The moisture loss was higher at 10000 ppm CO2 level. The broiler live weight until 35 days of age was higher for 10000 and 8000 ppm CO2 level in comparison to 6000 and 4000 ppm CO2 level. In conclusion, the CO2 levels had influence at pos hatch results and broiler performance, the 4000 ppm CO2 level had the best hatch and 8000 and 10000 ppm CO2 level had the best results in broilers until 35 days of age