Effects of Fermented Distiller's Grains on Growth Performance, Nutrient Apparent Digestibility and Rumen Fermentation of Finishing Yaks

  • CAO Guang ,
  • WANG Zhisheng ,
  • HU Rui ,
  • WANG Xueying ,
  • MA Jian ,
  • ZHOU Xinyu ,
  • ZHU Yixiao ,
  • WANG Cheng ,
  • PENG Quanhui ,
  • ZOU Huawei ,
  • XUE Bai ,
  • WANG Lizhi ,
  • LUO Xiaolin ,
  • GUAN Jiuqiang
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  • 1. Key Laboratory of Low Carbon Culture and Safety Production in Cattle in Sichuan, Animal Nutrition Institute of Sichuan Agriculture University, Chengdu 611130, China;
    2. Sichuan Academy of Grassl and Sciences, Chengdu 611731, China

Received date: 2020-02-19

  Online published: 2020-07-15

Abstract

The purpose of this study was to investigate the effects of different proportion of fermented distiller's grains in diets as a source of protein feed on growth performance, nutrient apparent digestibility, serum biochemical indexes and rumen fermentation of finishing yaks under stall-feeding. Thirty 3-year-old finishing yaks with good body condition and similar body weight[(188.2±13.9) kg] were randomly assigned to 3 groups (n=10). Nutrient levels of the diets for 3 groups were close, and the proportion of fermented distiller's grains in the 3 diets were 0 (control group), 2.5% (trial group Ⅰ) and 5.0% (trial group Ⅱ), respectively. The pretrial period was 15 days and the trial lasted for 60 days. The results showed as follows:1) compared with the control group, the average daily gain of yaks fed the diet with 2.5% fermented distiller's grains was significantly increased (P<0.05), and the feed/gain was significantly decreased (P<0.05); when the proportion of fermented distiller's grains was further increased from 2.5% to 5.0%, the average daily gain was significantly decreased (P<0.05), and the feed/gain was significantly increased (P<0.05). 2) When the proportion of fermented distiller's grains in the diet was 2.5%, the apparent digestibility of neutral detergent fiber was significantly increased compared with the control group (P<0.05), but when the proportion of fermented distiller's grains was further increased from 2.5% to 5.0%, the apparent digestibility of dry matter and neutral detergent fiber was significantly decreased (P<0.05). 3) The content of acetate in rumen fluid was the highest in the trial group Ⅰ among 3 groups, and significantly higher than that in the trial group Ⅱ (P<0.05), and the content of butyrate in rumen fluid in the trial groups Ⅰ and Ⅱ was significantly decreased compared with the control group (P<0.05). 4) The contents of serum total cholesterol in the 2 trial groups was significantly increased compared with the control group (P<0.05), but there were no significant differences in other biochemical indexes among 3 groups (P>0.05). In conclusion, fermented distiller's grains can be used as protein raw material in the diet of finishing yaks and the appropriate proportion is 2.5%, which can significantly increase the average daily gain and feed efficiency of finishing yaks.

Cite this article

CAO Guang , WANG Zhisheng , HU Rui , WANG Xueying , MA Jian , ZHOU Xinyu , ZHU Yixiao , WANG Cheng , PENG Quanhui , ZOU Huawei , XUE Bai , WANG Lizhi , LUO Xiaolin , GUAN Jiuqiang . Effects of Fermented Distiller's Grains on Growth Performance, Nutrient Apparent Digestibility and Rumen Fermentation of Finishing Yaks[J]. Chinese Journal of Animal Nutrition, 2020 , 32(7) : 3255 -3262 . DOI: 10.3969/j.issn.1006-267x.2020.07.035

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