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Articles by Sr.
Total Records ( 3 ) for Sr.
  D.A. Roland , Sr. and M. Bryant
  Two experiments were conducted to determine the most economical protein and lysine levels to feed laying hens during Phase I (weeks 21-36) of the laying cycle in order to optimize egg weight and profits when hens were exposed to warm (25.6 °C Average in Exp. 1) and cool temperatures (20.0 °C average in Exp. 2). In both experiments, nine hundred sixty 21-weeks old hens were randomly divided into six groups of 160 hens per group and fed one of six diets. Diets were formulated based on protein and lysine. Three diets formulated on protein contained 17.00, 18.70 and 20.80% protein and 0.90, 1.02 and 1.17% lysine, respectively. Three diets formulated based on lysine contained 0.75, 0.83 and 0.92% lysine and 14.98, 16.19 and 17.34% protein, respectively. Response criteria were egg production, feed consumption and egg weight. Neither diet nor method of formulation had an effect (p>0.05) on any response criteria other than egg weight in Exp. 1 and Exp. 2. In both experiments, egg weight increased (p<0.05) as the Lysine (or protein) content increased. Using an economic analysis with egg and feed prices at the time of the study, Bovans White hens required 1,076 mg lysine, 750 mg total sulphur amino acids (TSAA), 19.1 g protein and 264 kcal ME/hen/d for optimum profits during Phase I under warm conditions and 1,100 mg Lysine, 789 mg TSAA, 20.22 g protein and 310 kcal ME/hen/d during Phase I for maximum profits when kept under cool temperatures. Because feed and egg prices vary, there can be no fixed lysine (protein) requirement for optimal profit.
  P. Gunawardana , D.A. Roland , Sr. and M.M. Bryant
  This study was a 3 × 7 factorial arrangement of 3 lysine levels (0.917, 0.828 and 0.747) and seven commercial brown egg layer strains. The objective of this experiment was to determine the effect of increasing dietary lysine on performance, egg composition, egg solids, egg quality and profits in seven commercial brown egg layer strains and to determine the lysine requirement during phase one (from 21-36wk of age). This experiment lasted 16 weeks. Seven strains of hens (n = 240 of each strain) at 21 week of age were randomly divided into 21 treatments (8 replicates of 10 birds/treatment). The results showed that there were no interactions between lysine and strain on any parameter. Lysine had significant effects on egg weight, egg mass, feed conversion, percent albumen solids, yolk color, shell color, albumen weight, egg shell and albumen components. There were significant strain effects on egg production, feed consumption, egg weight, egg mass, feed conversion, specific gravity, yolk weight, shell color, shell, albumen and yolk components, yolk, albumen and whole egg solids. Strain 1 had the best overall performance. All strains peaked in production over 94% and were laying 94-96% at 36 weeks of age. Average egg weight (21-36wk) was 60.3g, varying from 59.0-62.8g between strains. Average feed intake was 112.3g/hen/day varying from 109.6-116.7g/hen/day between strains. Average egg weight of hens fed diets containing the highest lysine level was 2.04g heavier than the hens fed the diets containing the lowest lysine level. Increasing dietary lysine from 0.747-0.917% significantly improved feed conversion from 2.20-2.06g feed/g egg and increased egg mass from 51.8-54.32g/hen/day. Average lysine intake of hens fed 0.917% level was 1023mg/hen/day varying from 1005-1070mg/hen/day between strains. Because egg prices and ingredient prices often change, there can be no fixed dietary lysine level for optimal profits.
  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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