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Articles by D.J. Burnham
Total Records ( 2 ) for D.J. Burnham
  Jianlin Si , D.J. Burnham and P.W. Waldroup
  This study was conducted to explore the extent to which CP can be reduced in corn-soybean meal broiler starter diets by amino acid supplementation while maintaining adequate performance. Using corn and soybean meal of known composition, diets were formulated by linear programming using a minimum of 107.5% of NRC (1994) amino acid recommendations. No minimum CP was required; as each amino acid became limiting crystalline sources were provided to meet the minimum specification. In sequence these were Met, Thr, Lys, Val, Ile, Arg, Phe, and Trp, resulting in eight treatments ranging from 16.61 to 22.48% CP. All diets contained 0.3% sodium bicarbonate and 0.2% aluminum hydroxide as a buffer and antacid. Three additional treatments utilized potassium sulfate to maintain a minimum dietary electrolyte balance (Na + K - Cl) of 250 meq/kg. Each treatment was fed to twelve replicate groups of six male broiler chicks from 1 to 21 d. Reducing CP below 20% while providing indispensable amino acids resulted in a significant reduction in body weight (BW) and feed conversion ratio (FCR). Crude protein content of freeze-dried carcasses declined and fat content increased as diet CP decreased. Feather content (actual weight or % of BW) was not affected until the CP was reduced to less than 18%. Maintaining dietary electrolyte balance at 250 meq/kg in reduced CP diets had no significant effect on any parameter.
  M.T. Kidd , W.S. Virden , A. Corzo , W.A. Dozier and D.J. Burnham
  An experiment was conducted to determine the effects of feeding broilers diets differing in amino acid density during the finisher period. Also, the impact of L-threonine addition to high (H) or low (L) amino acid density diets was determined. Ross x 708 male broiler chicks were placed in floor pens and fed common diets from d 1 to 34 that met or exceeded NRC (1994) recommendations. From d 35 to 55, broilers were fed diets consisting of H (digestible Lys of 0.88%, TSAA of 0.69%, and Thr of 0.59%) or L (digestible Lys of 0.82%, TSAA of 0.64%, and Thr of 0.55%) amino acid density, with or without dietary L-threonine (9 replications each of 4 treatments). On d 55, live performance and carcass characteristics were determined. There were no interactions or L-threonine effects (P>0.05) on live performance or carcass traits of broilers. Body weight and feed intake did not differ due to amino acid density. Birds fed diets containing H amino acid density had higher (P< 0.05) breast meat yield (P = 0.06 relative to BW; P = 0.01 relative to carcass weight) and lower (P<0.05) feed conversion and percentage abdominal fat than birds fed diets with L amino acid density. Minimizing essential amino acid excesses through dietary L-threonine inclusion did not improve or adversely affect performance. An economic analysis indicated that decreasing amino acid density (H to L) in 35 to 55 d broilers resulted in an income loss of $0.10/live bird.
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