Performance and carcass characteristics of free-range broiler chickens fed diets containing alternative feedstuffs

the present study was carried out to evaluate the effects of alternative feedstuffs as partial substitutes of corn and soybean in free-range broiler diets on performance, carcass yield and technical-economic viability. a total of 400 pesco？o pelado broilers were distributed in a completely randomized experimental design (crd), with four treatments (treatment 1:control; treatment 2: 10% rice bran inclusion; treatment 3: 10% ground cassava leaves; and treatment 4: 10% ground lead tree hay) with four replicates per treatment. each replicate consisted of a group of 25 birds per paddock, separated per sex. initial weight (iw), final weight (fw), body weight (bw), daily weight gain (dwg), feed intake (fi) and feed conversion ratio (fcr) were evaluated. carcass, cuts (breast, thigh, drumstick, back, neck, leg and wings), abdominal fat and giblets (gizzard, heart and liver) yields were determined. the technical-economic viability of each treatment was assessed by determining the cost of feed per kg body weight, economic efficiency index and cost. the highest final weights were obtained with the use of rice bran. rice bran and cassava leaves promoted higher carcass yield, as well as lower back and abdominal fat yields. the use of cassava leaves showed better economic efficiency among the treatments with alternative feedstuffs. the use of alternative feedstuffs at 10% inclusion in substitution of corn and soybean meal did not not result in major changes in performance and carcass parameters, and economic efficiency, and therefore, their use is recommended when the availability or the price of key ingredients, such as soybean meal and corn, increase.