Effects of yeast culture in broiler diets on performance and immunomodulatory functions

文献类型： 外文期刊

第一作者： Gao, J.

作者： Gao, J.;Zhang, H. J.;Wu, S. G.;Qi, G. H.;Yu, S. H.;Gao, Y. P.;Yoon, I.;Quigley, J.

作者机构：

关键词： yeast culture;broiler;immune function;mucosal morphology;digestibility

期刊名称：POULTRY SCIENCE （ 影响因子：3.352； 五年影响因子：3.679 ）

ISSN： 0032-5791

年卷期： 2008 年 87 卷 7 期

页码：

收录情况： SCI

摘要： A study was conducted to evaluate the effect of supplemental yeast culture (Diamond V XP Yeast Culture; YC) in broiler diets on performance, digestibility, mucosal development, and immunomodulatory functions. One-day-old Arbor Acres chicks (n = 960) were randomly assigned to 1 of 4 dietary treatments based on corn and soybean meal and containing 0, 2.5, 5.0, and 7.5 g/kg of YC in the diet for 42 d. Each treatment consisted of 12 replicates of 20 broilers each. Nutrient digestibility was determined on d 15 and 35 by total fecal collection. On d 21 and 42, 12 birds per treatment were sacrificed to evaluate gut morphology and secretory IgA. Broilers were vaccinated with Newcastle disease vaccine by eye drop on d 7 and 28 and antibody titer was determined on d 14, 21, 35, and 42. Dietary supplemental YC at 2.5 g/kg improved average daily gain and feed conversion during grower and overall periods (P = 0.05). Yeast culture supplementation increased digestibility of Ca (linear and quadratic, P = 0.01) and P (linear, P = 0.01) on d 35, but did not affect (P > 0.05) protein retention and energy digestibility. Villus height to crypt depth ratios in the duodenum and jejunum (d 42) and ileum (d 21) were increased (P <= 0.05) in broilers fed 2.5 g/kg of YC. Yeast culture increased antibody titers to Newcastle disease virus (linear, P <= 0.05), serum lysozyme activity (linear and cubic, P <= 0.05), and IgM (linear, P <= 0.05) and secretary IgA concentrations in the duodenum (linear, P = 0.01). Results of this study indicate that dietary supplemental YC at 2.5 g/kg improved growth performance. Dietary YC affected immune functions, digestibility of Ca and P, and intestinal mucosal morphology of broilers. Growth performance was optimized at 2.5 g/kg of YC in the present study. Immune function could be modified with dietary YC supplementation.

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