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Articles by Andrew Bateman
Total Records ( 2 ) for Andrew Bateman
  Andrew Bateman , Zhenhua Liu and David A. Roland Sr.
  A study was conducted to compare bioefficacy of liquid DL-methionine hydroxy analogue-free acid (MHA-FA) and DL-methionine (DL-Met) in laying hens. Biological efficacy was determined for egg production, egg mass, and egg weight using five regression models. Four levels of DL-Met (0.012, 0.024, 0.036, and 0.048%) and MHA-FA (0.014, 0.027, 0.041, and 0.054%) were added on an equimolar basis to a basal diet containing 14.97% protein and 0.27% methionine. Twenty week old Hy-Line W-36 hens were used in this trial with 8 replicates per treatment. The bioefficacy of MHA-FA related to DL-Met was 0.77 on a weight basis (or 0.87 on a molar basis) based on egg mass with the best goodness of model fit (average R2 equal to 83.33%). The bioefficacy was 0.71 on a weight basis (or 0.80 on a molar basis) based on egg production with the goodness of model fit at average R2 equal to 76.98%. The bioefficacy was 1.03 on a weight basis (or 1.17 on a molar basis) based on egg weight with the goodness of model fit at average R2 equal to 68.83%.
  Andrew Bateman , D.A. Roland , Sr. and M. Bryant
  A study was conducted to determine the optimal methionine plus cysteine to lysine (Met+Cys/Lys) ratio in corn-soy diets of Hy-Line W-36 hens (wk 21-34) during Phase 1. Hens (n = 1,920; 21-wk old) were randomly divided into 12 groups of 160 hens per group (20 hens x 8 replicates for each treatment). Three levels of lysine (0.79, 0.87 and 0.97%) with four Met+Cys/Lys ratios (0.71, 0.75, 0.79 and 0.83) were used. Response criteria were egg production, feed consumption and egg weight. An interaction (P < 0.001) was observed between lysine (Lys) level and Met+Cys/Lys ratio on egg production, feed consumption and egg weight. Lowering the Met+Cys/Lys ratio in the lowest Lys diet (0.79%) had an adverse effect on egg production, feed consumption and egg weight, however there was little or no effect on these parameters in diets containing two higher Lys levels (0.87 and 0.97%). An economic analysis indicated that the optimal Met+Cys/Lys ratios for diets containing 0.97, 0.87 and 0.79% lysine were 0.71, 0.75 and 0.83, respectively. Results indicated that the current National Research Council (NRC, 1994) recommendation of 0.83 for the Met+Cys/Lys ratio was too high for diets containing higher lysine or protein levels required for low consuming hens at peak production. Egg producers using a Met+Cys/Lys ratio of 0.83 may be overfeeding synthetic methionine by as much as one pound or more per ton of feed.
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