Effects of Fermented Distiller's Grains on Growth Performance, Nutrient Apparent Digestibility and Rumen Fermentation of Finishing Yaks
CAO Guang1, WANG Zhisheng1, HU Rui1, WANG Xueying1, MA Jian1, ZHOU Xinyu1, ZHU Yixiao1, WANG Cheng1, PENG Quanhui1, ZOU Huawei1, XUE Bai1, WANG Lizhi1, LUO Xiaolin2, GUAN Jiuqiang2
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
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.
曹广, 王之盛, 胡瑞, 王雪莹, 马健, 周芯宇, 祝伊枭, 汪成, 彭全辉, 邹华围, 薛白, 王立志, 罗晓林, 官久强. 发酵酒糟对育肥牦牛生长性能、养分表观消化率及瘤胃发酵的影响[J]. 动物营养学报, 2020, 32(7): 3255-3262.
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. Chinese Journal of Animal Nutrition, 2020, 32(7): 3255-3262.
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