Effect of different levels of energy and protein with constant ratio on performance and carcass characteristics in broiler chickens
Journal Title: International Research Journal of Applied and Basic Sciences - Year 2012, Vol 3, Issue 12
Abstract
The aim of this study was to determine the effect of different levels of energy and protein with constant ratio on performance and carcass characteristics in broiler chickens. Three experimental diets were formulated to have 3 levels of ME and CP, respectively in each phase 23, 21% and 20% CP with 30316, 2768 and 2636 kcalkgin the starter phase; 22, 20%and 19% CP with 31743, 2886 and 2742 kcalkg in the grower phase; and 20, 18%and 17% CP with 3224, 3063 and 2902 kcalkg in the finisher phase; The ratio between CP and ME was maintained at 1318, 1443 and 1612 in the starter, grower and finisher respectively A total of 360 ROSS 308 strain reared for 42 days and were randomly divided into 30 experimental pens, 12 chickens in each pen, and each diet was offered to 10 replicates at random Wight gain was linearly decreased (p<0.05), whereas the feed intake and feed conversation ratio were increased (p</0.05), linearly as dietary protein and energy decreased in grower, finisher and overall experimental periods. Protein efficiency ratio and Energy efficiency ratio were decreased (p<0/05), when protein and energy reduced in grower, finisher and whole of experimental diets. But Use of different levels of energy and protein with constant ratio on carcass weight (CW), percentage of carcass, breast and thigh and other parameters of carcass such as liver, heart weight and abdominal fat had no significant effect (p>0.05). Feeding broiler chickens low ME and low CP with ME:CP ratio has adversely affected the growth performance, but carcass parameter not affected without any increase in liver weights and abdominal fat content.
Authors and Affiliations
M. Moosavi*| Department of Animal Science, Ramin (Khuzestan) Agricultural and Natural Resources University, Mollassani, Khuzestan, Iran,Mona Moosavi, No.13 Kianpars 20t St. Apt.1, Ahvaz, Iran, mona.moosavi61@gmail.com, M. Chaji| Department of Animal Science, Ramin (Khuzestan) Agricultural and Natural Resources University, Mollassani, Khuzestan, Iran, M. boujarpour| Department of Animal Science, Ramin (Khuzestan) Agricultural and Natural Resources University, Mollassani, Khuzestan, Iran, S. Rahimnahal| Department of Animal Science, Ramin (Khuzestan) Agricultural and Natural Resources University, Mollassani, Khuzestan, Iran, A. R Kazemi| Department of Accounting, Shahid Chamran University of Ahwaz, Khuzestan, Iran
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