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THE RESPONSE OF TWO BROILER GENOTYPES TO VARIOUS DIETARY PROTEIN LEVELS | ||
| iraqi poultry sciences journal | ||
| Article 1, Volume 2, Issue 2, 2007, Pages 234-245 | ||
| Authors | ||
| A. A. Al; Waleed M. Razuki; | ||
| Abstract | ||
| The purpose of this study was to examine the response of two broiler genotypes to various dietary protein levels (CP) in a starter and grower diets. A total of 900 – day old straight – run of broiler chicks of local Fawbro (LFB) and Lohmann (LHN) were placed on rice hulls in floor pens. Birds were fed one of three isocalaric diets formulated to provide 22 and 20% (D1), 20 and 18% (D2) or 18 and 16% (D3) in starter and grower diets, respectively. Feeding chicks low-protein (D3) during starter (18%) and grower periods (16%) resulted in inferior body weight (BW), relative growth percentage (RGW), feed consumption, feed conversion ratio, percentage of carcass yield and breast meat yield. The LHN attained better (P < 0.0001) performance than LFB. Results also indicated a significant genotype by CP level interaction for BW and GRW. Body weight response of LHN on high dietary protein level was better than LFB during starter, whereas, the pattern was changed during grower period. Reduction of protein level during starter period was more influential on BW than during grower period. It is suggested that the level of protein should be increased during starter period as the genetic potential for growth rate of modern commercial broiler chicks is genetically improved. | ||
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