›› 2017, Vol. 44 ›› Issue (9): 2629-2637.doi: 10.16431/j.cnki.1671-7236.2017.09.013

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Effects of Active Yeast and Yeast Fermented Feeds on Rumen Fermentation Parameters in vitro

ZHANG Zheng1,2, ZHANG Qi-wei1,2, YANG Jing-jing1,2, GAO Min3, HU HONG-Lian3, LIU Da-cheng1,2   

  1. 1. College of Veterinary, Inner Mongolia Agricultural University, Hohhot 010018, China;
    2. Key Laboratory of Clinical Diagnosis and Treatment Technology in Animal Disease, Ministry of Agriculture, Hohhot 010018, China;
    3. Animal Nutrition Institute, Inner Mongolian Academy of Agriculture and Animal Sciences, Hohhot 010030, China
  • Received:2017-03-28 Online:2017-09-20 Published:2017-09-22

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Abstract:

This study was aimed to investigate the effect of active yeast and yeast fermented feeds on rumen fermentation parameters in vitro.13 strains active yeasts and their fermented feeds (7 strains of Saccharomyces cerevisiae,namely XR4,YL5,YN7,XL8,BC,SL and AQ;5 strains of Candida utilis,namely SC18,SR12,YJ2,YD6 and BY,and 1 strains of Candida tropicalis,namely BR) were chosen and rumen fermentation parameters were measured by in vitro gas production technique.The results showed that:There was no significant effects of active yeasts on gas production (P>0.05),however,the gas production of SC18,XR4,BY,AQ and BC groups was significantly increased by the fermented feeds (P<0.05).Meanwhile,the gas production rate of those fermented feeds was significantly higher than the corresponding active yeasts (P<0.05).10 yeast strains and their fermented feeds significantly increased the bacterial crude protein production (P<0.05),and the protein growth rate of most of these active yeasts was higher than that of fermented feeds (P<0.05).The activie yeasts and fermented feeds showed no significant effect on ammoniacal nitrogen content (P>0.05).Active yeast (YD6,BR,SC18,YL5,XR4,SR12,BY and BC) and yeasts fermented feeds (YD6,BR,YJ2,SC18,SR12,SL,YL5 and XR4) could significantly increase the total VFAs comapred to control group (P<0.05).In conclusion,active yeast could significantly increase the contents of bacterial crude protein and total VFAs,especially the BY,XR4 and BC. Gas production,bacterial crude protein and VFAs were significantly increased by fermented feeds,especially SC18,BY and BC. Fermented feeds had shown better effect on the increament of the gas production and VFAs compared to active yeasts.

Key words: active yeast; yeast fermented feed; in vitro gas production technique; ruminal fermentation parameters

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