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Articles by David A. Roland Sr.
Total Records ( 2 ) for David A. Roland Sr.
  Hafiz Anwar Ahmad and David A. Roland Sr.
  An experiment was conducted to determine the effect of feeding method (constant vs. variable) and method of formulation (lysine vs. protein) on the performance and profits of molted Dekalb Delta hens from 86 to 94 wk of age as influenced by egg and feed prices. Treatments 1 to 5 were formulated based on lysine to contain 0.69 to 0.57% TSAA and fed continuously regardless of feed consumption (constant feeding). Treatments 6 to 10 were formulated based on lysine to supply 650 to 570 mg TSAA and treatments 11 to 15 were formulated base on protein to supply 660 to 580 mg TSAA per hen per d and were fed based on feed intake. Dietary TSAA level had no overall significant effect on feed consumption, egg production, egg weight, mortality, or body weight. Hens fed diets using constant method of feeding had slightly higher egg production than hens fed diets formulated based on lysine or protein using variable method of feeding. However, egg weight, egg specific gravity, and body weight were not different. Two variable feeding methods had no significant effects on feed consumption, egg production, egg weight, egg specific gravity, or body weight. These results demonstrate that there can be no fixed TSAA or protein requirement of molted hens for maximum profits.
  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%.
 
 
 
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