Pakistan Journal of Nutrition1680-51941994-7984Asian Network for Scientific Information10.3923/pjn.2009.597.600KhampaSittisak ChaowaratPala SinghalertRungson WanapatMetha 5200985Ten, one year old of native cattle with initial body weight of 150 ± 10 kg were randomly divided into two groups and received concentrate at 14% CP (T1) and Yeast Fermented Cassava Chip (YFCC) (T2). The cows were offered the treatment concentrate at 1% BW and ruzi grass was fed ad libitum. Means were compared using T-test. All animals were kept in individual pens and received free access to water. The results have revealed that replacement of YFCC on feed intake was non-significantly different, while Average Daily Gain (ADG) was higher (p<0.05) in native cattle fed YFCC (T2) treatments than received concentrate at 14% CP (T1) (259 and 205 g/d). In addition, the ruminal pH, ammonia-nitrogen and blood urea nitrogen concentration were significantly different (p<0.05). Supplementation of YFCC (T2) could improve population of bacteria and fungal zoospore, but decreased populations of Holotrich and Entodiniomorph protozoa in rumen (p<0.05). The results indicate that supplementation of Yeast Fermented Cassava Chip (YFCC) as a replacement concentrate at 14% CP could improve rumen fermentation efficiency in native cattle.]]>Boonnop, K., M. Wanapat, N. Ngamnit and S. Wanapat,20082008pp: 97102Brossard, L., F. Chaucheyras-Dur, B. Michalet-Doreau and C. Martin,200682829836Chanjula, P., M. Wanapat, C. Wachirapakorn, S. Uriyapongson and P. Rowlinson,200316211216Chanjula, P., M. Wanapat, C. Wachirapakorn, S. Uriyapongson and P. Rowlinson,20041714001410Crocker, C.L.,196733361365Fernandez, J.M., T. Sahulu, C. Lu, D. Ivey and M.J. Potchoiba,199726105107Goering, H.K. and P.J. van Soest,19701970