Relationship between Starch and Amino Acid Levels of Broiler Diets on Growth Performance and Feed Efficiency

This study was conducted to investigate the relationship between starch and amino acid levels of broiler diets on growth performance and feed efficiency. In this study, 240 one-day old chicks were distributed to 6 treatments using a completely randomized design (CRD) with four replications. Three treatments were fed with high starch and three others were fed with low starch. Both type of diets were formulated as isocaloric with three levels of total lysine, varying from 1.34%, 1.43%, 1.48% for starter period (0-18 days) and 1.18%, 1.3%, 1.35% for finisher period (19-35 days). The result showed that high starch level increased body weight gain (p < 0.01) and feed intake at 35 days (p < 0.05). Feed conversion ratio was better for the birds were fed a high starch level diet (1.66) compare with the low starch level (1.71). No interaction between starch level and amino acid level was observed for body weight gain, feed intake and feed conversion ratio at 35 days. No differences for blood parameter glucose. Uric acid and insulin was affected by starch and amino acid level. Significant interaction between starch level and amino acid was observed for uric acid. It was concluded that feeding high starch level based on corn soya diet increased body weight gain and feed intake. Starch level has relationship with blood glucose, insulin and utilization of protein and energy in broiler.