Effects of Compound Bacteria Fermented Rice Straw on Growth Performance, Rumen Fermentation Parameters and Microbial Structure of Angus Cattle

  • XIE Jianlin ,
  • ZHANG Qiaoe ,
  • ZHANG Zhuandi ,
  • LIANG Xiaojun ,
  • WANG Ruigang ,
  • JIANG Wu
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  • 1. College of Agriculture, Ningxia University, Yinchuan 750021, China;
    2. Institute of Animal Science, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China;
    3. Benwang Ecological Agriculture Co., Ltd., Yinchuan 750104, China

Received date: 2020-10-22

  Online published: 2021-05-14

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Abstract

This experiment was to investigate the effects of compound bacteria fermented rice straw on growth performance, rumen fermentation parameters and microbial structure of Angus cattle. Twenty healthy 14-month-old Angus cattle with similar body weight [(390.47±50.14) kg] were randomly divided into two groups with 10 replicates in each group and 1 cattle in each replicate. Cattle in rice straw group (RS group) were fed a rice straw+corn silage+concentrate total mixed ration, and cattle in fermented rice straw group (FRS group) were fed a fermented rice straw+corn silage+concentrate total mixed ration, the nutrient levels of two groups were basically the same. The pre-experimental period lasted for 7 days, and the experimental period lasted for 93 days. The results showed as follows:1) the compound bacteria fermented rice straw was found to be hollow and cracked in surface, and the fiber structure changed. Compared with rice straw and fermented control, the contents of neutral detergent fiber (NDF), acid detergent fiber (ADF) and zearalenone and total mold count were decreased, the crude protein (CP) content and total bacterial count were increased, and the aflatoxin B1 and vomitoxin were not detected. 2) Compared with RS group, the average daily gain and average daily feed intake of FRS group were significantly increased (P<0.05), and in feed to gain ratio was significantly decreased (P<0.05). 3) Compared with RS group, the rumen microbial protein content of FRS group was significantly increased (P<0.01), and the pH and contents of ammonia nitrogen, total volatile fatty acids and butyrate acid and acetate/propionate in rumen were no significant difference (P>0.05). 4) Compared with RS group, the Sobs index of FRS group was significantly increased (P<0.05), the Ace index and Chao index were significantly increased (P<0.01), the Shannon index showed an increasing trend (P=0.093), while the Simpson index was no significant difference (P>0.05). 5) At the phylum level, the dominant phyla of two groups were Firmicutes and Bacteroidetes. The Bacteroidetes relative abundance of FRS group was significantly higher than that of RS group (P<0.05), and the Firmicutes relative abundance was significantly lower than that of RS group (P<0.05). On the genus level, the dominant genus of two groups was Ruminococcus_2, and the rest genera with relative abundance higher than 5% of RS group were Lachnospiraceae_NK4A214_group, Rumi-nococcaceae_NK4A214_group, Rikenellaceae_RC9_gut_group and Prevotella_1; and the rest genera with relative abundance higher than 5% of FRS group were Prevotella_1, Rik-enellaceae_RC9_gut_group, Lachnospiraceae_NK3A20_group and Ruminococcaceae_NK4A214_group etc. Among them, the Lachnospiraceae_NK3A20_group relative abundance of RS group was significantly higher than that of FRS group (P<0.01). In conclusion, compound bacteria fermentation can change the fiber structure of rice straw, improve the nutritional value, and slow down the mildew. Feeding compound bacteria fermented rice straw can improve the growth performance, improve rumen fermentation environment and increase microbial community diversity and richness of Angus cattle, and affect the microbial structure at phylum and genus levels.

Cite this article

XIE Jianlin , ZHANG Qiaoe , ZHANG Zhuandi , LIANG Xiaojun , WANG Ruigang , JIANG Wu . Effects of Compound Bacteria Fermented Rice Straw on Growth Performance, Rumen Fermentation Parameters and Microbial Structure of Angus Cattle[J]. Chinese Journal of Animal Nutrition, 2021 , 33(5) : 2738 -2751 . DOI: 10.3969/j.issn.1006-267x.2021.05.033

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