Animal and Poultry Nutrition Department, Desert Research Center, Cairo, Egypt.
Genetic Engineering and Biotechnology Research Institute, University of Sadat City, Sadat City, Egypt.
Sci Rep. 2022 Jul 29;12(1):12990. doi: 10.1038/s41598-022-16988-5.
The combination of live yeast and microalgae as feed supplementation could improve rumen fermentation and animal productivity. This study aimed to investigate the impact of a mixture of (YA) yeast (Saccharomyces cerevisiae) and microalgae (Spirulina platensis and Chlorella vulgaris) as feed supplementation on feed intake, rumen disappearance of barley straw, bacteria, and fermentation, blood parameters of camels and sheep. Three fistulated camels and three fistulated rams were fed a concentrates mixture and ad libitum barley straw as a basal diet alone or supplemented with YA mixture. The dietary supplementation improved the feed intake, rumen disappearance of barley straw nutrients, and the blood immunity parameters. The YA supplementation affected rumen fermentation as well as the composition and diversity of rumen bacteria; however, the response to the supplementation varied according to animal species. Principle Coordinate Analysis (PCoA) separated bacterial communities based on animal species and feeding treatment. Phylum Bacteroidetes and Firmicutes dominated the bacterial community; and the dominant genera were Prevotella, RC9_gut_group, Butyrivibrio, Ruminococcus, Saccharofermentans, Christensenellaceae_R-7_group, and Succiniclasticum. Our results suggest positive impacts of YA supplementation in rumen fermentation and animal performance.
将活酵母和微藻作为饲料补充剂结合使用可以改善瘤胃发酵和动物生产性能。本研究旨在探讨酵母（酿酒酵母）和微藻（螺旋藻和普通小球藻）混合物作为饲料补充剂对骆驼和绵羊的采食量、瘤胃中大麦秸秆的消失、细菌和发酵、血液参数的影响。将 3 只有瘘管的骆驼和 3 只有瘘管的绵羊用浓缩物混合物和自由采食的大麦秸秆作为基础日粮单独或补充 YA 混合物进行饲养。日粮补充提高了饲料采食量、瘤胃中大麦秸秆营养物质的消失以及血液免疫参数。YA 补充剂影响了瘤胃发酵以及瘤胃细菌的组成和多样性；然而，对补充的反应根据动物种类而有所不同。主坐标分析（PCoA）根据动物种类和饲养处理分离了细菌群落。门拟杆菌门和厚壁菌门是细菌群落的主要优势菌门；优势菌属为普雷沃氏菌属、RC9_gut_group、丁酸弧菌属、瘤胃球菌属、糖发酵短杆菌属、克里斯滕森菌科_R-7_group 和琥珀酸拟杆菌属。我们的研究结果表明 YA 补充剂对瘤胃发酵和动物性能有积极影响。
