Effect of Low Dietary Crude Protein, Metabolizable Energy and Ideal Amino Acids Levels on Productive Performance of Broiler Chicks

Abstract

The goal of the study was to evaluate reduced dietary crude protein and energy levels, with or without supplemental amino acids, on broiler chicks' productive performance. At one day old, 270 Arbor Acres broiler chicks were divided randomly into six equal groups, containing 45 chicks /group in three replicates (15 birds/each). The chicks were allocated to the following diets, (T1) fed basal diets (BD) of 23,21 and 18 % CP and 3000,3100 and 3200 kcal/kg diet ME ( control); (T2) fed BD reduced -3% CP and -100 kcal ME; (T3) fed BD reduced 3% CP and recommended ME supplemented with AAs (Lys, Met, Thr and Trp); (T4) fed BD reduced 3% CP and recommended ME supplemented with AAs (Lys, Met, Thr, Trp and Val). (T5) fed Bd with a reduced 3% CP and 100 kcal ME supplemented with AAs (Lys, Met, Thr and Trp); (T6) fed BD with a reduced 3% CP and 100 kcal ME supplemented with AAs (Lys, Met, Thr, Trp and Val). From 1 to 35 d of age during starter, grower and finisher periods, there was a highly significant (P≤0.001) effect between treatments on LBW, BWG, FI, FCR and PI, at all periods of estimation. Birds of treatments 1, 6 and 4, respectively had the higher averages LBW and BWG and significantly improved (P≤0.001) FCR and PI compared with other treatments applied. Birds of treatments 1 and 2 had significantly (P≤0.001) higher FI than other treatment. Birds of treatments 6, 4 and 5, respectively showed the highest averages of relative economic efficiency (REE), compared with other treatments. It could be recommended for broiler diets that CP level can be reduced by 3% and ME by 100 kcal/kg with maintaining the same AA levels (Lys, Met, Thr, Trp, and Val) to give equal performance of strain recommendation diets.

A review of okara (soybean curd residue) utilization as animal feed: Nutritive value and animal performance aspects

“…Diaz-Vargas et al ( 2016) also reported that broiler chicken fed with diets containing okara up to 10% did not show any detrimental effects on their growth performance and FCR (1.79-1.86). In another study, there were no differences in carcass yield when broiler chickens were fed diets with various levels of okara (El-Nagmy et al, 2004;Ibrahim, 2006). Okara can replace about 60% of the soybean meal in growing duck's diet without any change in performance (Dong et al, 2005).…”