BIOLOGYCAL VALUES: TRUE METABOLIZABLE ENERGY (TME) AND TRUE AMINO ACID AVAILABILITY (TAAA) OF PROTEIN SOURCES DETERMINED IN NEWLY HATCHED BROILER CHICKS

Abstract

Research of biological values of protein sources determined in newly hatched
broiler chick was done aimed to study metabolisability and availability of protein
sources in newly hatched broiler chicks. Chick achieve their optimal growth when
chicks are provide to meet the nutritional requirement, however, immediately
post-hatch the requirement are not well defined. To these True Metabolisable Energy
(TME) and True Amino Acid Availability of soybean meal and casein were observed
to determine biological value of protein sources in chick aged l, 3 and 10 days. TME
and TAAA were determined based on the methods of Murakami et al. (1994) and
Yarnamki (1986). Statistically analysis was done by GLM-SAS (SAS Institute, 1982).
TME of Soybean meal at1ained optimum value at 3-days (p<0.01), whereas, TME of
casein peaked at 1 day (p<0.01) with no age dependency. A metabolisability of casein was higher than soybean meal. Availability of amino acid was varying, chicks fed soybean meal low in availability of tyrosine and trypthophan at all ages determined and among the amino acids it was characterized high availability of methionine and cysteirt Difierent to soybean meal, chicks fed casein was characterized by high availability of amino acid at day 1, decreased at day 3 and again increased to day 10.