Poult. Sci.
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Poult Sci 2006. 85:2176-2179
© 2006 Poultry Science Association
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METABOLISM AND NUTRITION

Effect of ß-Mannanase (Hemicell) on Growth Performance and Immunity of Broilers

X. T. Zou1, X. J. Qiao and Z. R. Xu

Animal Science College, Zhejiang University, HangZhou, 310029, P. R. China

1 Corresponding author: xtzou{at}zju.edu.cn

Two hundred four broilers (1-d-old) were randomly allocated to 4 treatments, each of which had 3 pens of 17 chicks per pen and were used to investigate the effects of ß-mannanase (Hemicell) on growth performance and immunity. The chicks received the same basal diet based on corn-soybean meal and Hemicell was added to the basal diet at 0, 0.025, 0.05, and 0.075%, respectively. Weight of each replicate was determined at wk 0, 3, and 6 of age. There were no significant differences in average feed intake in the 0- to 3-wk and 0- to 6-wk periods, and no differences in serum IgA, or IgG concentrations. However, the addition of Hemicell significantly increased (P < 0.05) weight gain in the 4- to 6-wk and 0- to 6-wk periods. Feed conversion for the 0.025 and 0.05% groups was significantly greater (P < 0.05) than for the control group in the 4- to 6-wk and 0- to 6-wk periods. Hemicell significantly increased (P < 0.05) the serum IgM concentration in 3- and 6-wk-old broilers. Proliferation of T lymphocytes in 6-wk-old broilers for the 0.05% group was also improved (P < 0.05) significantly. The results indicate that Hemicell may improve growth performance and immunity of broilers.

Key Words: Hemicell • growth performance • immunity • broiler






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