RUMINANT AND HERBIVORE NUTRITION AND FEED

Effects of Dietary Active Dried Yeast on Nutrient Apparent Digestibilities and Rumen Fungal Community Composition of Beef Cattle

  • PENG Quanhui ,
  • YUE Shuangming ,
  • WANG Zhisheng ,
  • XUE Bai ,
  • WANG Lizhi ,
  • TIAN Gang ,
  • KANG Kun ,
  • HU Rui
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  • 1. Key Laboratory of University in Cattle Low Carbon Breeding and Safety Production in Sichuan Province, Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, China;
    2. Sichuan Water Conservancy Vocational College, Chengdu 611230, China

Received date: 2021-01-23

  Online published: 2021-08-11

Supported by

 

Abstract

This experiment was conducted to investigate the effects of dietary active dried yeast on nutrient apparent digestibilities and rumen fungal community composition of beef cattle. A total of 18 beef cattle (Simmental crossbred×Pian cattle ♀) with body weight of (110±13) kg and similar age were randomly divided into three groups with 6 cattle in each group. Cattle in 3 groups were fed basal diet (control group), basal diet+2 g/(d·head) active dried yeast (ADY2 group) and basal diet+4 g/(d·head) active dried yeast (ADY4 group), respectively. The pre-experimental period lasted for 10 days, and the experimental period lasted for 110 days. The results showed that the nutrient apparent digestibilities of neutral detergent fiber (NDF) and acid detergent fiber (ADF) of ADY2 group and ADY4 group were significantly higher than those of the control group (P<0.05), however, there was no significant difference between ADY2 group and ADY4 group (P>0.05). A total of 272 fungal operational taxonomic units (OTUs) were detected in control group, while 543 and 527 OTUs were detected in ADY2 group and ADY4 group, respectively. The Simpson, Shannon and PD indexes of ADY2 group and ADY4 group were significantly higher than those of the control group (P<0.01), and ADY2 group was significantly higher than ADY4 group (P<0.05 or P<0.01). The principal coordinate analysis (PCoA) results showed that the control group could be clearly distinguished from the ADY2 group and ADY4 group. Seven phyla were identified from 18 rumen samples, which were Ascomycota, Neocallimastigomycota, Basidiomycota, Mucoromycota, Glomeromycota, Rozellomycota and Fungi_NA. The relative abundances of Ascomycota, Neocallimastigomycota and Basidiomycota of ADY2 group and ADY4 group were significantly higher than those of the control group (P<0.05); the Fungi_NA relative abundance of ADY2 group and ADY4 group was significantly lower than that of the control group (P<0.05), and ADY2 group was significantly lower than ADY4 group (P<0.05). The unclassified fungi relative abundance of ADY2 group and ADY4 group was significantly lower than that of the control group (P<0.05); the relative abundances of Neocallimastix, Orpinomyces and Candida of ADY2 group were significantly higher than those of control group and ADY4 group (P<0.05), but there was no significant difference between ADY4 group and control group (P>0.05). In conclusion, dietary active dried yeast increases the relative abundances of Ascomycota, Neocallimastigomycota and Basidiomycota in rumen, increases the relative abundances of Neocallimastix, Orpinomyces and Candida, and decreases the fungi_NA relative abundance. Under this experimental conditions, dietary supplementation of 2 g/(d·head) active dried yeast is enough to change the of rumen fungal community composition and improve the fiber apparent digestibilities.

Cite this article

PENG Quanhui , YUE Shuangming , WANG Zhisheng , XUE Bai , WANG Lizhi , TIAN Gang , KANG Kun , HU Rui . Effects of Dietary Active Dried Yeast on Nutrient Apparent Digestibilities and Rumen Fungal Community Composition of Beef Cattle[J]. Chinese Journal of Animal Nutrition, 2021 , 33(8) : 4456 -4466 . DOI: 10.3969/j.issn.1006-267x.2021.08.026

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