ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (10): 2156-2165.doi: 10.11843/j.issn.0366-6964.2019.10.023

• RESEARCH NOTES • Previous Articles     Next Articles

Effects of Yeast Culture Supplementation in High-Concentration Diet on Nutrient Digestibility and Rumen Fermentation of Fattening Hu Sheep

ZHAO Guohong1,3, WANG Shiqin1, WANG Fen2, WANG Hong2, DIAO Qiyu1, HAN Xiangmin3, ZHANG Naifeng1*   

  1. 1. Key Laboratory of Feed Biotechnology of Ministry of Agriculture and Rural Affairs, Feed Research Institute of Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    2. Beijing Enhalor Biotechnology Co., Ltd., Beijing 100083, China;
    3. College of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730070, China
  • Received:2019-04-19 Online:2019-10-23 Published:2019-10-23

Abstract: The objective of this study was to investigate the effects of different levels of yeast culture (YC) supplementation in high-concentration diet on nutrients apparent digestibility and rumen fermentation parameters of fattening Hu sheep. A total of 120 healthy male Hu sheep with an average body weight of 50 kg (4-5 months old) were randomly assigned into 4 groups (n=30) balanced on body weight. Sheep in control group (CON) were offered a basal diet (concentrate:forage=75:25) without YC supplementation, sheep in 3 experimental groups as group A, B and C were fed the basal diet supplemented with 10, 20 and 40 g·d-1 YC, respectively. Each group had 5 replicates with 6 sheep. The whole experiment lasted 37 d with an adaptation period (7 d) and experiment period (30 d). At the end of the experiment, 5 sheep were selected from each group for digestive metabolism experiment for determination of apparent digestibility and rumen fermentation parameters. The results showed as follows:1)Group A and B had a tendency to increase dry matter intake(P=0.064); The apparent digestibility of DM and OM in group A, B and C were significantly higher than that in CON group(P<0.05), but there were no significant differences among group A, B and C (P>0.05); The apparent digestibility of CP in group A and B were significantly higher than that in CON group(P<0.05); In addition, the apparent digestibility of NDF and ADF in group A were significantly higher than that in CON group(P<0.05). 2) GE and ME intakes in group A, B and C were significantly higher than that in CON group(P<0.05);The metabolizability of GE in group A and B were significantly higher than that in CON group (P<0.05). 3) Apparent digestible nitrogen in group A, B and C were significantly higher than that in CON group(P<0.05), but there were no significant differences among group A, B and C (P>0.05);There were no significant differences in retained nitrogen, utilization rate and biological value of nitrogen among all groups (P>0.05). 4)There were no significant differences in rumen pH, TVFA, acetate, propionate, butyrate and acetate/propionate among all groups (P>0.05); NH3-N concentration in group A and C were significantly higher than that in CON group (P<0.05). The results indicate that under the conditions of this experiment, the supplementation of 10 g·d-1YC can improve the apparent digestibility of nutrients, energy and nitrogen utilization of fattening Hu sheep, but has no obvious effect in improving the rumen environment; The higher doses of YC did not show additional positive effects.

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