Abstract: After feeding differently processed corn as dietary to yanbian semi-fuzz sheep with fistulas, the pH varieties were not significantly different in all experimental groups. The concentration of NH₃-N in the whole corn group was significantly lower than the other two groups after 3 h（P<0.05）, however, after 6 h, the mealy corn group was significantly lower than the other two groups（P<0.05）. The activities of CMCase and xylanase were not significantly different in all experimental groups. The variation of protozoa population of the granule corn group in rumen trended to be higher than the other two groups, but not significant. Also, there was no significant difference among all experimental groups in feeder nutriment digestibility.

Key words: mealy corn; granule corn; whole corn; pH; HN₃-N; enzyme activity