Efeito dos níveis de energia metabolizável e lisina digestível sobre o rendimento de carcaça de frangos de corte com 42 dias

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The objective of this study was to evaluate the carcass yield of broilers fed diets containing different levels of energy and digestible lysine in the growth phase from 21 to 42 days old . We used 768 male Cobb broilers , 21 days old, divided in a completely randomized design containing 16 treatments (four lysine levels x four energy levels ), three replicates of 16 birds each . The lysine levels were 0.9 , 1.0, 1.1 and 1.2% , and the energy levels were 2800 , 2950 , 3100 and 3250 kcal kg -1 . The different levels of digestible lysine increased linearly ( P 0.05) on this variable . There was no interaction between levels studied on the yield of breast, thigh and drumstick , wings and legs . We conclude that there is little effect of the levels of energy and digestible lysine contained in the diets of broilers on carcass yield and cuts , from 21 to 42 days old. However, higher deposition occurs of abdominal fat with increasing energy levels in the feed , and this deposition is smaller with increasing supplementation of lysine .