Effects of yeast culture in broiler diets on performance and immunomodulatory functions
Effects of yeast culture in broiler diets on performance and immunomodulatory functions
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DOI：
10.3382/ps.2007-00418
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发表时间：
2008-07-01
期刊：
影响因子：
4.4
通讯作者：
Qi, G. H.
中科院分区：
文献类型：
--
作者：
Gao, J.;Zhang, H. J.;Qi, G. H.
本研究旨在评价在肉鸡日粮中添加酵母培养物(钻石V XP酵母培养物；YC)对肉鸡生产性能、消化率、粘膜发育和免疫调节功能的影响。选用1日龄Arbor Acres雏鸡(n=960)，随机分为4组，每组12个重复，每个重复20只肉鸡。在第15天和第35天，用总粪便采集法测定养分消化率。在第21天和第42天，每个处理组处死12只鸡，以评估肠道形态和分泌型IgA。分别于第7、28天用新城疫疫苗滴眼免疫肉鸡，于第14、21、35、42天测定抗体效价。日粮中添加2.5g/kg的YC提高了生长阶段和整个生长阶段的平均日增重和饲料转化率(P=0.05)。在第35天添加酵母培养物可提高钙(线性和二次曲线，P=0.01)和磷(直线曲线，P=0.01)的消化率，但不影响蛋白质存留率和能量消化率(P>；0.05)。十二指肠、空肠和回肠绒毛高度/隐窝深度比(D 42)和回肠(D 21)增加(P
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