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Articles by J.H. Kersey
Total Records ( 2 ) for J.H. Kersey
  Jianlin Si , J.H. Kersey , C.A. Fritts and P.W. Waldroup
  Levels of lysine (Lys) and methionine (Met) in excess of NRC recommendations may result in enhanced performance, especially in regard to breast meat yield (BMY). Some people have interpreted the "ideal Protein" concept to suggest that amino acids such as Met should be kept in an "Ideal" ratio with Lys even though Lys may be in excess of actual needs. The objectives of this study were twofold: 1) to evaluate the effects of levels of Lys and Met in excess of NRC recommendations in diets of male broilers grown for further processing; 2) to determine if any interaction exists between levels of Lys and Met when minimum levels are exceeded. Three studies of identical design were conducted. Corn, soybean meal and corn gluten meal of known composition were used to formulate basal diets for 0 to 3, 3 to 6, and 6 to 9 wk which provided a minimum of 110% of NRC (1994) amino acid recommendations other than Lys, Met and TSAA which were at 100% of recommended levels. From the base diets, experimental diets were derived by additions of lysine HCl and DL methionine to provide a factorial arrangement with three levels of Lys (NRC, NRC + 0.15%, NRC + 0.3%) and four levels of Met and TSAA (NRC, NRC + 0.05%, NRC + 0.1%, NRC + 0.15%). Each of the 12 diets was fed to two (trial 1) or four (trial 2 and 3) replicate pens of 50 male broilers (Cobb 500). Birds were weighed and feed consumption determined at 3, 6, 7, 8, and 9 week. Samples of birds were processed at 7, 8, 9 wk for parts yield. Although significant differences in performance were noted among trials due to environmental temperature there was no trial x treatment interaction so data were combined. There were no significant interactions between Lys and Met for any parameter when both were fed equal to or in excess of NRC recommendations. Increasing Lys above NRC recommendations significantly improved BW and FCR at 21 d but not at later ages; BMY was improved by increasing Lys only at 63 d. Increasing Met above NRC significantly improved FCR at 42 and 56d; there was no significant effect of Met levels on BMY at any age. Results of this study suggest that people formulating diet on "Ideal Protein" basis should not elevate the level of Met if lysine is in excess of its minimum needs.
  F. Yan , J.H. Kersey , C.A. Fritts and P.W. Waldroup
  It has been frequently demonstrated that addition of phytase to corn-soybean meal diets will improve the utilization of the phytate-bound P for the broiler chicken. The effect of phytase on release of other nutrients such as Ca is less clear-cut. A study was conducted to examine the effects of phytase supplementation on diets with various dietary levels of Ca and nonphytate P (nPP). A diet was formulated that provided nutrients in excess of NRC (1994) recommendations with 1.0% Ca and 0.50% nPP. By varying the amounts of dicalcium phosphate, limestone, and sand in aliquots of a common basal diet, diets were prepared with 1) Low-P and Low-Ca, 2) Low-P and High-Ca, 3) High-P and Low-Ca, and 4) High-P and High-Ca. The diets were analyzed for Ca and P content and blended as needed to provide test diets in a factorial arrangement of three Ca levels (0.5, 0.7, and 0.9%) with eight levels of nPP (0.15 to 0.50% in increments of 0.05%). These 24 diets were divided and half supplemented with 1000 units/kg of phytase. Each treatment was fed to six pens of six male broilers from one to 21 d of age. Response of both body weight and tibia ash to phytase supplementation in broilers was significantly affected by dietary Ca levels as well as dietary nPP levels. Without phytase supplementation, both body weight and tibia ash were depressed at the lowest level of nPP as dietary Ca level increased. Adding phytase to these diets improved both body weight and tibia ash as a result of increased availability of P. At both 0.5% and 0.7% Ca, the dietary Ca level was a limiting factor in maximizing tibia ash regardless of P level or phytase supplementation. These data indicate that minimal Ca appeared to be released by phytase and that no reduction in Ca level of broiler should be implemented with phytase supplementation.
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