ustitución de la harina de soja con mezcla hojas de yuca:harina de sangre, en dietas de pollos con o sin sumplementación de enzimas

摘要

Two hundred and sixteen unsexed day-old Cobb broilers of a commercial strain were used to study the effect of replacement of soybean meal (SBM) by cassava leaf:blood meal mix (CLM:BM) with or without enzyme supplementation on broiler growth and performance. The birds were divided into 6 groups of 36 birds each after balancing for live weight. Each group was further sub-divided into 6 replicates of 6 birds each. CLM:BM replaced SBM at 0, 25 and 50 % on weight for weight basis. The resulting three dietary combinations were supplemented with a commercial enzyme (Maxigrain?) at the rates of 0 and 100 ppm thus resulting in 6 dietary treatments. The six groups of 36 birds were randomly allotted to the six experimental diets. Feed and water were provided free choice during the 56 days experimental period during which data were collected on performance, nutrient retention, feed transit time and carcass characteristics of birds. Replacement of SBM with CLM:BM mix had no effect (p>0.05) on weight gain (WG), feed intake (FI), feed: gain ratio (F:G), crude protein (CP), ether extract (EE) and crude fibre retention (CF), dressing percentage, breast cut, drumstick, thigh liver and kidney weights but significantly (p<0.05) reduced intestinal transit time (ITT) and abdominal fat while increasing gizzard and caecum weight. Enzyme supple-mentation however significantly (p<0.05) improve WG and reduced F:G, improved (p>0.05) nutrient retention, dressing and abdominal fat percentage but had no effect on FI. No mortality was recorded in the course of this study. Enzyme supplementation significantly (p<0.05) reduced gizzard and caecum weights. It was concluded that in broiler feeding CLM:BM mix can effectively replace 50 % SBM without adverse effect on the birds. Supplemen-tation of diets with enzyme led to further impro-vement in performance of broilers.