The kinetics of growth, feed intake, and feed efficiency reveal a good capacity of adaptation of slow and rapid growing broilers to alternative diets

Poultry production currently relies on the use of soybean as main protein and energy source. Reducing its proportion in poultry diets partly replacing it with local feedstuffs would improve sustainability by reducing dependence importations environmental impact production. In this study, we evaluated sunflower meal, fava bean, canola dried distillers grains solubles performance rapid slow growing chickens. Animals were reared groups floor. Individual BW feed intake data collected throughout each animal's life, thanks to an electronic station. At 5 wk (for broilers) 12 chickens), birds slaughtered obtain carcass composition meat quality data. Adaptation alternative diet was studied separately for genotype. Firstly, performed ANOVA effect daily individual BW, intake, conversion ratio. Secondly, variability performances within group effects diet, period, their interaction. Finally, correlations between final at slaughter calculated understand construction phenotypes identify early indicators performances. The results showed that animals adapted well mean being mostly similar 2 both genotypes (<3% BW). However, observations highlighted critical importance periods around dietary transitions showing impacted genotypes. For example, ratio Label Rouge-alternative 14% lower during 3 d after than before. It underlined fact adapting management batch be necessary. Correlations chickens determined whereas criterion cumulative These also suggested reserves might modified giving rise more glycogen less fat reserves.