GROWTH AND CARCASS RESPONSES OF THREE LINES OF LOCAL CHICKENS AND ITS CROSSING TO DIETARY LYSINE AND METHIONINE

Abstract

Testing upon lines of local chickens has been continuing to gather more
information in order to built commercial lines for either meat or egg producers.
There were 120 day old chicks (doc) of PelungxPelung, KeduxKedu,
KampungxKamp1mg, PelungxKampung and 80 doc KeduxKa.mpung raised
intensively in wire cage. Four experimental rations, fonnulated to contain 2900 kkal
ME/kg with 150 g protein/kg, were differentiated to contain: 1) 8.5 g lysine with 3. 2
g methio‘nine/kg, 2) 12.8 g lysine/kg with 3.2 g methionine/kg, 3) 12.8 g lysine/kg
with 4.8 g lysine/kg and 4) 17 g lysine/kg with 4.8 g methionine/kg. Each cell of
treatment contained three times of 10 unsexed-doc. At the age of 12 weeks two birds per cage were killed for carcass evaluation. Results at the age of 12 weeks showed that there was no significant effect of dietary amino acids on growth of birds,
showing figures about 870-966 g/bird Total consumption (2900-3400 g/bird) and FCR (3.2 - 3.5) were not statistically difierent between lines or between experimental rations. Empty bodyweight (525 - 691 g/kg bodyweight, BW), chest girth (26 cm/bird) and length of breast-bone (8-9 cm/bird) were not significantly affected by lines nor by dietary amino acids. Breast meat (around 115-134 g/kg BW) for PelungxPelung and KeduxKamp\mg tended to decrease with the increase in amino acids content, but other lines tended to increase or unchanged with the increase in dietary amino acids. Leg meat (aroimd 155-188 g/kg BW) of KeduxKedu line decrease with increase in dietary amino acids, whilst for other lines revealed
slightly increase. In general, there were no convincing parameters’ responses to
increased dietary lysine and methionine to manipulate meat growth of native
chickens.