AMINO ACID REQUIREMENTS OF BROILER CHICKS

Abstract

This experiment was designed to estimate the amino acid requirements of broiler chicks used a usual ingredient feed stuff in Indonesia. Seven hundred broiler chicks used in 4 experiments, set on 3 experimental factors design consisted of elevations (0 and 600 m above the sea level), season (rainy, dry and intermediate), breeds (Arbor acres and Hubbard). Lysine were used at level 0.68-1.56% and 0.64-1.24%, methionine were used at level 0.27-0.75% and 0.29-0.51%, threonine were used at level 0.51-0.95% and 0.52-0.76% and tryptophan were used at 0.14-0.28% and 0.l5—0.23% at starter and finisher periods, respectively. Experimental diets
contained 15% crude protein and metabolism energy 2900 kcal/kg at starter period and at finisher period 3200 kcal/kg. Data of growth rate used to see of cinve response reached plateau to estimate the lysine and methionine requirements. Data from threonine and tryptophan used by oneway statistical analyzed. The result of this experiment indicated that requirement of lysine were estimated 1.44% and 1.19% based from exponential response curve Y=30(H-89(1-EXP(-
2.2X)) and Y=900+89(l-EXP(-l.485X)), methionine were 0.63% and 0.49% based from exponential response curve Y=282+68(l-EXP(-6.86X-0.27)) and Y=900+30(1-EXP(-3.74X-0.29)) and threonine was 0.84% and 0.695% (P<0.05) at starter and finisher periods, respectively. Level of tryptophan in this experiment non significant (P>0.05).