摘要：The impact of crude protein (CP) levels on carcass protein content and growth of broiler were examined. Day old (200) chicks with average live body weight 41.60 g were equally divided into four groups A, B, C and D, fed 17 (control), 20, 23 and 26% CP, respectively. Feed intake, live body weight, feed conversion ratio (FCR), carcass weight and carcass protein contents were investigated. Average daily weight gain was 33.4, 39.0, 43.9 and 44.4g/bird against the feed consumption of 76.1, 86.0, 93.4 and 89.1 g/bird, with FCR of 2.28, 2.20, 2.12 and 2.00 in group A, B, C and D, respectively. Carcass weight 778.0, 996.3, 1180 and 1190 g/bird, carcass protein content was 37, 41, 46 and 49%, in group A, B, C and D, respectively. Greater (p<0.01) carcass weight of 1180 and 1190 g/bird and carcass protein content 46, 49% was obtained from ration contained 23 or 26% CP, respectively compared to control. The total price per bird earned was Rs. 57.76, 67.24 75.24 and 76.32 against total cost of 54.16, 59.77, 67.24 and 69.59/bird, respectively. The broiler growth and carcass protein content improved significantly (p<0.01) by increasing level of CP. It is concluded that group A (17% CP) or group D (26% CP) were less economical against 23 and 20% CP levels where fairly higher income was earned. However, from nutritional point of view 26% CP contained ration produced high protein carcass.
