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ICV
SHORT COMMUNICATION
 
CC-BY 4.0
 
 

The effect of different doses of Astragalus root extract on in vitro rumen fermentation of steam-flaked maize grains used as an only substrate

D. J. Deng 1,  
J. Wang 2,  
L. P. Ren 1,  
Z. M. Zhou 1,  
Q. X. Meng 1  
 
1
State Key Laboratory of Animal Nutrition and College of Animal Science and Technology, China Agricultural University, Beijing 100094, P.R. China
2
Jiangsu Poultry Institute, Chinese Academy of Agricultural Sciences, Yangzhou, Jiangsu 225261, P.R. China
J. Anim. Feed Sci. 2007;16(Suppl. 2):172–177
Publish date: 2007-09-17
KEYWORDS
ABSTRACT
An in vitro study was conducted to determine the effect of different doses of Astragalus root extract (ARE, Huangqi) on rumen fermentation of steam-flaked maize grains. Rumen fluid was taken from 3 crossbred steers fed a 55% forage to 45% mixed concentrate ratio diet. As ARE dose was increased, ruminal ammonia-N concentration was decreased in a dose dependent manner, whereas total volatile fatty acid concentration and total gas production were increased linearly (P<0.001). Increasing ARE doses resulted in decreased molar proportion of acetate and increased molar proportion of propionate as well as a decrease in acetate: propionate ratio. In conclusion, ARE could stimulate the mixed ruminal fermentation as well as modify the pattern of rumen fermentation in vitro.
CORRESPONDING AUTHOR
Q. X. Meng   
State Key Laboratory of Animal Nutrition and College of Animal Science and Technology, China Agricultural University, Beijing 100094, P.R. China
ISSN:1230-1388