期刊
POULTRY SCIENCE
卷 88, 期 7, 页码 1407-1412出版社
OXFORD UNIV PRESS
DOI: 10.3382/ps.2008-00433
关键词
broiler; glycine; sulfur amino acid; growth; uric acid
Four experiments were conducted to determine the interactive effects of Gly, TSAA, and Lys in corn-soybean meal diets on growth performance of broilers. All experiments were conducted with female Ross x Ross 308 or 708 broilers in brooder batteries from 0 to 18 d posthatching. Treatments had 5 to 8 replications with 5 or 6 broilers per replicate pen. Diets in all experiments were fed without or with Gly (2.32% total Gly + Ser). All diets contained 0.25% L.Lys. HCl except in experiment 1, where no crystalline Lys was added. In experiment 1, the total dietary Lys level was 1.26% with TSAA: Lys of 0.72 and 0.76. Increasing TSAA: Lys increased (P < 0.07) G: F. The main effect of Gly was not significant for ADG, ADFI, or G: F; however, G: F was increased by Gly in broilers fed 0.72 but not in those fed 0.76 TSAA: Lys (Gly x TSAA: Lys, P < 0.03). In experiment 2, the total dietary Lys level was 1.26% with TSAA: Lys of 0.51, 0.68, 0.72, and 0.76. Glycine addition did not affect ADG, ADFI, or G: F; however, increasing TSAA: Lys linearly increased (P < 0.01) ADG, ADFI, and G: F and the response was quadratic for ADG and G: F. Experiment 3 was similar to experiment 2 except the total dietary Lys level was 1.35%. Glycine addition increased (P < 0.03) G: F and decreased (P < 0.04) serum uric acid (SUA) and serum urea N concentrations. Also, increasing TSAA: Lys linearly and quadratically (P < 0.02) increased ADG, ADFI, and G: F. In experiment 4, broilers were fed 2 levels of total dietary Lys (1.26 and 1.35%), 3 levels of TSAA: Lys (0.72, 0.76, and 0.80), and without or with Gly supplementation up to a total of 2.32% Gly + Ser. Glycine addition increased ADG (P < 0.02) and G: F (P < 0.01). The increase in G: F with Gly was not the same for all TSAA: Lys (Gly x TSAA: Lys, P < 0.07). Increasing Lys increased (P < 0.01 to 0.10) ADG, ADFI, and G: F. Glycine addition increased ADG and ADFI more in broilers fed 1.35% Lys than in those fed 1.26% Lys (Lys x Gly, P < 0.09). Glycine addition increased SUA in broilers fed 1.26% Lys but decreased SUA in broilers fed 1.35% Lys (P < 0.01). Glycine addition decreased SUA in broilers fed the TSAA: Lys of 0.80 but not at the other TSAA: Lys (P < 0.08). These data indicate that Gly increased G: F and decreased SUA in diets with 1.35% Lys and excess TSAA.
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