TITLE:
Relative Bioavailability of DL and L-Methionine in Broilers
AUTHORS:
Enric Esteve-Garcia, Daulat Rehman Khan
KEYWORDS:
Bioavailability, DL-Methionine, L-Methionine, Broilers
JOURNAL NAME:
Open Journal of Animal Sciences,
Vol.8 No.2,
April
12,
2018
ABSTRACT: Studies on the relative bioavailability (RBV) of DL-Methionine
(DL-Met) to L-Methionine (L-Met) have produced variable results. An experiment
was conducted to determine the RBV of DL to L-Met. A total of 2268 1-day old
male chicken were housed in 54 floor pens (42 bird/pen). There were 9
treatments (6 repetitions) including the basal diet (BD). The BD was deficient
in Met content with 0.27, 0.26 and 0.25 in the starter, grower and finisher
periods respectively. Four levels of experimental diets for each DL-Met and
L-Met were created by supplementing 0.05%, 0.10%, 0.15% and 0.20% of DL- or
L-Met to the BD. The feeding program consisted of starter (0-14 d, 21% CP and
2900 kcal ME/kg), grower (15 - 28 d, 20% CP and 3000 kcal
ME/kg) and finisher period (29 - 37 d, 18.5% CP and 3050 kcal
ME/kg). Chickens and feed were weighed at the end of each age period.
Regression coefficients of a common plateau asymptotic regression were used to
calculate RBV. Birds responded to gradual increase in Met levels, BW, FCR and
ADG were significantly (P 0.05)
higher in treatment groups as compared to control. Through the study period (37 d), the RBVs of DL-Met for
BW and FCR were 89 and 77 respectively.