Replacement value of lysine and methionine for super concentrate in broiler chick’s yield and quality

الملخص EN

The effect of dietary lysine and methionine supplementation on the growth performance and carcass characteristics of one hundred twenty five, day –old broiler chicks were studied .Five experimental diets A,B,C,D and E were formulated with increasing levels of lysine and methionine without using a super concentrate except in diet E in which super concentrate was used (A=1.2%lys +0.49%met ,B=1.31 %lys +0.56%met ,C=1.4 ?%lys+0.6% met ,D=1.54 % lys+0.62 % met and E 1.5 % lys +0.62 %met ) The results showed that with increasing levels of lysine and methionine, a significant ( p<0.05) improvement in feed intake ,average body weight gain and feed conversion ratio (FCR )was observed ,in the two test groups C and D containing subsequent increasing levels of lysine and methionine compared to the control group A containing no super concentrate.

All test groups showed non-significant (p>0.05) effects on non-carcass components, commercial cuts, meat yield and the average subjective meat quality scores compared with diet A.

KEYWORDS: dietary lysine and methionine, commercial cuts, subjective meat quality scores.