Growth curve of broiler chicken submitted the cassava meal diet
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Abstract
a diet rich in essential nutrients to maximize poultry performance.
In this context, cassava stands out, source rich in carbohydrates
and can provide great weight gain and decrease the cost of
production. Current success in genetic improvement in birds has
caused changes in the growth curve, however the objective was to
model the weight growth of broiler chickens fed diets containing
cassava. A total of 450 male broiler chickens of Cobb lineage were
used. The experimental design was completely randomized with
five treatments (0, 25, 50, 75 and 100% inclusion of cassava meal)
and five repetitions, each experimental unit was composed of 18
birds. To evaluate the weight performance according to age and the
inclusion of cassava in the animals’ diet, adjustments of regression
models were proposed. Power, hyperbolic tangent and gamma
models presented the best results for estimating broiler chickens
weight. Power model was the most adequate for estimating the
weight of broiler chickens as it presents the best criteria (R²=99.7%;
SSR=0.09 and AIC=-82.34). The adoption of the power model
provides information on the best level of inclusion of cassava
meal (100%) and the best time for slaughtering (42 days) birds
maximizing the weight in 3,295 g.
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