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title: Evaluation of Different Yeast Species for Improving In vitro Fermentation of Cereal Straws
author: Wang, Zuo;  He, Zhixiong;  Beauchemin, Karen A.;  Tang, Shaoxun;  Zhou, Chuanshe;  Han, Xuefeng;  Wang, Min;  Kang, Jinhe;  Odongo, Nicholas E.;  Tan, Zhiliang
Issued Date: 2016
Abstract: Information on the effects of different yeast species on ruminal fermentation is limited. This experiment was conducted in a 3x4 factorial arrangement to explore and compare the effects of addition of three different live yeast species (Candida utilis 1314, Saccharomyces cerevisiae 1355, and Candida tropicalis 1254) at four doses (0, 0.25x10(7), 0.50x10(7), and 0.75x10(7) colony-forming unit [cfu]) on in vitro gas production kinetics, fiber degradation, methane production and ruminal fermentation characteristics of maize stover, and rice straw by mixed rumen microorganisms in dairy cows. The maximum gas production (Vf), dry matter disappearance (IVDMD), neutral detergent fiber disappearance (IVNDFD), and methane production in C. utilis group were less (p<0.01) than other two live yeast supplemented groups. The inclusion of S. cerevisiae reduced (p<0.01) the concentrations of ammonia nitrogen (NH3-N), isobutyrate, and isovalerate compared to the other two yeast groups. C. tropicalis addition generally enhanced (p<0.05) IVDMD and IVNDFD. The NH3-N concentration and CH4 production were increased (p<0.05) by the addition of S. cerevisiae and C. tropicalis compared with the control. Supplementation of three yeast species decreased (p<0.05) or numerically decreased the ratio of acetate to propionate. The current results indicate that C. tropicalis is more preferred as yeast culture supplements, and its optimal dose should be 0.25x10(7) cfu/500 mg substrates in vitro.
Related URLs: 10.5713/ajas.15.0188
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Recommended Citation:
Wang, Zuo,He, Zhixiong,Beauchemin, Karen A.,et al. Evaluation Of Different Yeast Species For Improving In Vitro Fermentation Of Cereal Straws[J]. Asian-australasian Journal Of Animal Sciences,2016,29(2):230-240.

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