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Articles by M.M. Bryant
Total Records ( 3 ) for M.M. Bryant
  Z. Liu , G. Wu , M.M. Bryant and D.A. Roland Sr.
  A 3 x 4 factorial experiment with three protein levels (17.52, 16.24 and 15.22%) and four added synthetic lysine levels (0.0000, 0.0295, 0.0590 and 0.0884%) was conducted to determine the influence of adding synthetic lysine in er diets while maintaining a 0.75 Met+Cys/Lys ratio. In this experiment, a total of 1,440 Hy-Line W-36 hens (first phase of second cycle) were randomly divided into 480 cages with 3 birds per cage. Five adjoining cages consisted of a group and then the ninety-six groups were randomly assigned to 12 dietary treatments. The results showed there were no interactions (P > 0.05) between protein level and added synthetic lysine on feed intake, egg production, egg mass, egg weight or feed conversion. Protein effects were observed for feed intake (P < 0.01), egg production (P < 0.01), egg mass (P < 0.01), egg weight (P < 0.05) and feed conversion (P < 0.05). There was no difference (P > 0.05) obtained among the four supplemental synthetic lysine levels, indicating the influences of adding synthetic lysine on performances was not significant (P > 0.05) for hens fed diets containing a low protein level up to 15.22% and with feed intake at approximate 100 g/hen/day.
  G. Wu , Z. Liu , M.M. Bryant and D.A. Roland Sr.
  Five commercial white egg layer strains (Current-Bovans, Older-Bovans, Oldest-Bovans, Experimental-Bovans, and Dekalb) were used to compare performance and nutrient requirements when fed three protein levels (16.00, 14.85 and 13.99%). There were eight replicates of 15 hens (67 wk of age) for each treatment and the trial lasted 10 weeks. The results showed that there were no interactions between protein and strain on feed intake, egg production, egg mass, egg weight, feed conversion, egg specific gravity, and body weight of hens. Protein had significant effects on feed intake, egg mass, egg weight, egg specific gravity, and body weight. There were significant strain effects on feed intake, egg production, egg mass, egg weight, feed conversion and egg specific gravity. Current-Bovans had the best overall performance among the five layer strains. However, Dekalb had significant higher egg weight compared to Bovans. The best performance of Current-Bovans and Dekalb was obtained with hens fed the diet containing 16.00% protein. Current-Bovans hens required 16.5 g protein, 640 mg TSAA, 856 mg lysine, and 296 kcal ME per hen daily or 0.31 g protein, 12.00 mg TSAA, 16.07 mg lysine, and 5.55 kcal ME per g egg for the best performance. Dekalb hens required 17.8 g protein, 691 mg TSAA, 925 mg lysine, and 319 kcal ME per hen daily or 0.34 g protein, 13.04 mg TSAA, 17.45 mg lysine, and 6.03 kcal ME per g egg for the best performance.
  A. Bateman , Z. Liu , M.M. Bryant , G. Wu and D.A. Roland Sr.
  Two studies were conducted to compare bioefficacy of liquid DL-methionine hydroxy analogue-free acid (MHA-FA) and DL-methionine (DL-Met). Biological efficacy was determined for egg production, feed consumption, egg mass, and egg weight using linear and nonlinear regression models. In Experiment 1, five levels of DL-Met (0.023, 0.045, 0.068, 0.090 and 0.113%) and MHA-FA (0.026, 0.051, 0.077, 0.102 and 0.128%) were added on an equimolar basis to a basal diet containing 14.97% protein and 0.27% Met. This trial used 1,760 first cycle, Phase II Hy-Line W-36 hens. There was no response above the basal diet in any of the criteria measured, so regression analysis was not performed. In Experiment 2, five levels of DL-Met (0.012, 0.024, 0.036, 0.048 and 0.060%) and MHA-FA (0.014, 0.027, 0.041, 0.054 and 0.068%) were added on an equimolar basis to the basal diet used in Experiment 1. This trial used 1,760 second cycle, Phase I Hy-Line W-36 hens. The average bioefficacy of MHA-FA related to DL-Met was 82.45% on a weight basis (or 93.70% on a molar basis) based on egg production, was 89.23% on a weight basis (or 101.40% on a molar basis) based on egg mass, and was 106.29% on a weight basis (or 120.79% on a molar basis) based on egg weight, more research is needed to improve accuracy of bioefficacy values.
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