Substituição parcial do milho pelo sorgo e da proteína do farelo de soja pela proteína do farelo de caroço de algodão extrusado em rações para frangos de corte

Abstract

This work had duration of 35 days and was lead in the Department of Zootecnia of the Agricultural Federal University of Pernambuco with the objective to evaluate the use of sorghum and of the expander cottonseed meal in substitution to the corn and soybean meal. 300 chickens had been used, males, of the commercial mark Ross, in the experimental period of 7 up to 42 days of age. The treatments had consisted of five experimental rations: ration standard with energy source (100% corn) and protein source (100% soybean meal), ration with energy source (50% corn + 50% sorghum) and protein source (100% soybean), ration contend energy source (50% corn + 50% sorghum) and protein source (86,67% soybean + 13,33% expander cottonseed meal), ration contend energy source (50% corn + 50% sorghum) and protein source (73,34% soybean meal + 26,66% expander cottonseed meal), ration contend energy source (50% corn + 50% sorghum) and protein source (60,01% soybean + 39,99% expander cottonseed meal). The weights of the birds had been observed in accordance with the manual of the ancestry. The evaluated parameters had been consumption of ration, profit of weight and alimentary conversion (in the periods of 7 the 21 days and 22 the 42 days of age and in the total period). To the 42 days of age the animals had been abated and its carcasses evaluated for income of carcass, weight and income of breast, drumstick, thigh, wing, back, gizzard, liver, heart and abdominal fat. The statistical analyses had been carried through by means of comparison of averages between treatments and regression between the treatments.