Effect of different levels of energy and protein of diet on fattening and growth performance of native kids

Document Type : Research Paper


Assistant Professor, Department of Animal science, Agriculture and Natural Resources Research Center of Chaharmahal and Bakhtiari Province, Shahrekord, Iran


Effects of different levels of energy and protein of diets on fattening and growth performance of kids were investigated by using 54 weaned native male kids. Experimental kids were randomly assigned in a randomized complete design with a factorial arrangement of 3×3. They received two main elements source of energy and protein in ration with three levels of each in diets of 1 to 9 for 90 days. Levels of metabolizable  energy in ration was E 2.4, E 2.8 and E 2 Mcal/kg and levels of theirs crud protein was P.14, P.16.8 and P.12 percent respectively. Ratios of energy to protein in consumed experimental diets were equivalent 1.2, 1 and 0.8 of NRC. Daily feed intake, feed conversion ratio and daily gain of fattening kids were determined. The result showed that highest and lowest of final fatten weight and daily gains of kids were observed in diet of E 2.8: P 16.8 and E 2: P: 14 ratio with value of 35.7 and 32.5 kg respectively (P<0.05). The least and highest of daily dry mater consumed was observed in diets of E 2.8: P 16.8 and E 2: P12 ratio and amounts of 788 and 970 gr respectively (P<0.05). The lowest (best) and worst of feed conversion ratio were observed in diets of E 2.8: P 16.8 and E 2: P: 12 with amounts 6.9 and 10.5 respectively (P<0.05). It can conclude that energy and protein levels suggested by NRC were appropriate for these animals.


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