The experiment was conducted to investigate the effects of infusion of different levels of soybean small peptides (SSP) on rumen fermentation and rumen microbes in Luxi cattle. Four heads of Luxi cattle fixed with permanent ruminal cannula were used in a 4×4 Latin square design. Cattle were infused SSP by 0, 100, 200 and 300 g/d, respectively. Ruminal fluid was collected for the analysis of rumen fermentation indices, as well as the relative content of rumen microbes by real-time PCR. The results showed as follows: the mean of ruminal pH was not significantly affected by SSP infusion (P>0.05), the means of NH3-N and MCP concentrations were significantly increased (P<0.05); the concentration of total volatile fatty acid (TVFA) was significantly increased by SSP infusion (P>0.05), compared with those in 0 g/d group, the proportions of propionate in 200 g/d group and 300 g/d group were increased significantly (P<0.05), while the proportions of acetate in 100 g/d group and 200 g/d group, as well as the proportions of butyrate in 300 g/d group were decreased significantly (P<0.05); the ratio of acetate to propionate was significantly decreased by SSP infusion (P<0.05); the relative content of Butyrivibrio fibrisolvens was significantly increased by SSP infusion (P<0.05). In conclusion, infusion of SSP can promote microbial protein synthesis, increase Butyrivibrio fibrisolvens content and improve rumen metabolism.［Chinese Journal of Animal Nutrition, 2011, 23（8）：1324 -1331］
WANG Wenjuan,WAN Fachun,YANG Weiren,SONG Enliang,LIU Xiaomu,TAN Xiuwen,LIU Guifen
. Infusion of Soybean Small Peptides into Rumen: Effects on Rumen Fermentation of Beef Cattle[J]. Chinese Journal of Animal Nutrition, 2011
, 23(08)
: 1324
-1331
.
DOI: 10.3969/j.issn.1006-267x.2011.08.011
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