Avaliação nutricional da farinha de varredura de mandioca (Manihot esculenta Crantz) para frangos de corte

Abstract

The objective of this trial was to evaluate the potential of cassava by product use in broilers diets during 42 days. There were used 360 male pullets, Ross strain, with one day old in a randomized block design experiment. The birds were submitted to five treatments (inclusion levels of 0, 7,5, 15, 22,5 and 30% FVM) and six replications containing twelve pullets per pen. Diets were isoenergetic and isoproteic in initial phase (until 21 days) and final phase (from 22 days until 42 days). The performance parameters weekly evaluated were: feed consumption, weight gain and feed to gain ratio. On economic viability there were used an feed costs sheet and the live broilers price to calculate feeding costs, gross income, gross margin and profitability. After 42 days sixty broilers, two per pen presenting the average pens weight, were slaughtered after four hours of feed withdrawal, for evaluation of carcass, cuts, offal and total fat weights. Their yields related to live weight and carcass weight were calculated. The chest and thigh plus drumstick were deboned and their yields calculated as related to cuts, carcass and live weight. Shinbone color was evaluated using Roche colorimetric Index. Performance and economic parameters evaluated shows absence of FVM effect. Gizzard weight and yield and shinbone color were linearly affected. Meat yield of thigh plus drumstick presented a quadratic response. Cassava by product meal can be incorporated in broiler diets in amount of 30%, without affecting the performance, carcass yield, and economic evaluation.