SULPHUR AMINO ACID REQUIREMENT FOR MAXIMUM GROWTH OF BROILER CHICKS IN INDONESIA

Abstract

This experiment was designed to estimate tlte sulphur amino acids (SAA)
requirement of broiler chicken diets using an endogenous feedstuff. One hundred
and seventy five day old unsexed broiler chicks were used in this experiment and set
on 3 experiment factor design consisted of elevations (0 and 600 m above the sea
level), seasons (rainy, dry and intermediate), and breeds (Arbor Acres and Hubbard).
Two periods of experiment were carried out to estimate the requirement of SAA at
starter (0 — 21 d) and finisher (22 — 42 d) periods. SAA were used at level of 0.51 %, 0.63 %, 0.75 %, 0.87 %, 0.99 % and 0.52 %, 0.575 %, 0.63 %, 0.685 %, 0.74 % at starter and finisher periods, respectively. Experiment diets contained 15 % crude protein and metabolism energy 2900 kcal/kg and 3200 kcal/kg at starter and finisher periods. Data of growth rate were used to determine the curve response reached plateau. Data of growth rate were analysed by regression non linear asymptotic. Exponential response curve were fitted to experiment data points using the following equations: Y = A + B (1 — EXP)  used SPSS for Windows to calculate parametric approach and Microsofi Excel program to calculate value of X on Y 95 % maximum. The result of this experiment indicated that the effect of elevations and
seasons were highly significant (P<0.01), but the effect of breed was not significant.
Interactions between the experiment factors and level of SAA was significant
(P<0.05). The requirement of SAA on elevation 0 rn above the sea level was
estimated 0.90 % and 0.73 %, 600 m above the sea level 0.91 % and 0.71 %, dry
seasons 0.89 % and 0.67 %, intermediate seasons 0.90% and 0.71 %, rainy seasons 0.88 % and 0.71 %, breed Arbor Acres and Hubbard 0.90 % and 0.68 % at starter and finisher period, respectively. Based on pooling using means of growth rate, the result of this experiment indicated that the requirement of SAA level for maximum growth was estimated 0.87 % and 0.72 % based from exponential response curve Y = 282 + 68 (1 —EXP ^-6.86(x-20)) and  Y = 282 + 80 (1 —EXP ^{-3,74(x-0,29)}) at starter and finisher periods, respectively. Requirement SAA in subtropical countries was 0.74% and 0.66 %, so this requirement 0.13 % and 0.06 % higher than sub tropical recomrnendaticn at starter and finisher periods, respectively. Based on this experiment indicated that broiler chicken in Indonesia need higher amino acids for maximum growth.