References

AOAC, 1990. Official Methods of Analysis. 15th Edn., Association of Official Analytical Chemists, Washington, DC., USA., pp: 200-210.

Antai, S.P. and P.M. Mbongo, 1994. Utilization of cassava peels as substrate for crude protein formation. Plant Foods Human Nutr., 46: 345-351.
CrossRef  |  

Chen, X.B. and M.J. Gomes, 1992. Estimation of Microbial Protein Supply to Sheep and Cattle Based on Urinary Excretion of Purine Derivative-an Overview of the Technique Details. IFRU/RRI, Aberdeen, UK.

Chen, X.B., F.D Hovell, E.R. Oskov and D.S. Brown, 1990. Excretion of purine derivatives by ruminants: Effect of exogenous nucleic acid supply on purine derivative excretion by sheep. Br. J. Nutr., 63: 131-142.
PubMed  |  Direct Link  |  

Corona, L., G.D. Mendoza, F.A. Castrejon, M.M. Crosby and M.A. Cobos, 1999. Evaluation of two yeast cultures (Saccharomyces cerevisiae) on ruminal fermentation and digestion in sheep fed a corn stover diet. Small Ruminant Res., 31: 209-214.
CrossRef  |  Direct Link  |  

Crocker, C.L., 1967. Rapid determination of urea nitrogen in serum or plasma without deproteinization. Am. J. Med. Technol., 33: 361-365.
PubMed  |  Direct Link  |  

Emmanuel, B., M.J. Lawlor and D. Mcleese, 1970. The effect of phosphate and carbonate-bicarbonate supplements on the rumen buffering systems of sheep. Br. J. Nutr., 24: 653-660.
CrossRef  |  Direct Link  |  

Firkins, J.L., 1996. Maximizing microbial protein-synthesis in the rumen. J. Nutr., 126: 1347-1354.
Direct Link  |  

Fonty, G. and F. Chaucheyras-Durand, 2006. Effects and modes of action of live yeasts in the rumen. Biologia, 61: 741-750.
CrossRef  |  Direct Link  |  

Galvao, K.N., J.E. Santos, A. Coscioni, M. Villasenor, W.M. Sischo and A.C. Berge, 2005. Effect of feeding live yeast products to calves with failure of passive transfer on performance and patterns of antibiotic resistance in fecal Escherichia coli. Reprod. Nutr. Dev., 45: 427-440.
CrossRef  |  PubMed  |  Direct Link  |  

Galyean, M., 1989. Laboratory Procedure in Animal Nutrition Research. Department of Animal and Life Science, New Mexico State University, Las Cruces, USA., pp: 107-122.

Hungate, R.E., 1969. A Roll Tube Method for Cultivation of Strict Anaerobes. In: Methods in Microbiology, Norris, J.R. and D.W. Ribbons (Eds.). Academic Press, New York, USA., pp: 117-132.

Jouany, J.P., 2006. Optimizing rumen functions in the close-up transition period and early lactation to drive dry matter intake and energy balance in cows. Anim. Reprod. Sci., 96: 250-264.
CrossRef  |  Direct Link  |  

Kawas, J.R., R. Garcia-Castillo, F. Garza-Cazares, H. Fimbres-Durazo, E. Olivares-Saenz, G. Hernandez-Vidal and C.D. Lu, 2007. Effects of sodium bicarbonate and yeast on productive performance and carcass characteristics of light-weight lambs fed finishing diets. Small Rumin. Res., 67: 157-163.
CrossRef  |  Direct Link  |  

Khampa, S., M. Wanapat, C. Wachirapakorn, N. Nontaso, M.A. Wattiaux and P. Rowlison, 2006. Effect of levels of sodium DL-malate supplementation on ruminal fermentation efficiency of concentrates containing high levels of cassava chip in dairy steers. Aisan-Aust. J. Anim. Sci., 19: 368-375.
CrossRef  |  Direct Link  |  

Kumar, U., V.K. Sareen and S. Singh, 1997. Effect of yeast culture supplement on ruminal microbial populations and metabolism in buffalo calves fed a high roughage diet. J. Sci. Food Agric., 73: 231-236.
CrossRef  |  Direct Link  |  

Leng, R.A., 1990. Factors affecting the utilization of 'poor-quality' forages by ruminants particularly under tropical conditions. Nutr. Res. Rev., 3: 277-303.
CrossRef  |  PubMed  |  Direct Link  |  

Mertens, D.R. and L.O. Ely, 1979. A dynamic model of fiber digestion and passage in the ruminant for evaluating forage quality. J. Anim. Sci., 49: 1085-1095.
Direct Link  |  

NRC, 2001. Nutrient Requirements of Dairy Cattle. 7th Edn., National Academy Press, Washington, DC, ISBN: 978-0-309-06997-7, Pages: 405.

Newbold, C.J., R.J. Wallace, X.B. Chen and F.M. McIntosh, 1995. Different strains of Saccharomyces cerevisiae differ in their effect on ruminal bacterial numbers in vitro in sheep. J. Anim. Sci., 73: 1811-1818.
Direct Link  |  

Oboh, G. and A.A. Akindahunsi, 2003. Biochemical changes in cassava products (flour and gari) subjected to Saccharomyces cerevisae solid media fermentation. Food Chem., 82: 599-602.
CrossRef  |  Direct Link  |  

Owens, F.N. and R. Zinn, 1988. Protein Metabolism of Ruminant Animals. In: The Ruminant Animal Digestive Physiology and Nutrition, Church, D.C. (Eds.). Waveland Press, Illinois, pp: 227-249.

Pinos-Rodrıguez, J.M., P.H. Robinson, M.E. Ortega, S.L. Berry, G. Mendozad and R. Barcena, 2008. Performance and rumen fermentation of dairy calves supplemented with Saccharomyces cerevisiae 1077 or Saccharomyces boulardii 1079. Anim. Feed Sci. Technol., 140: 223-232.

Preston, T.R. and E. Murgueitio, 1992. Strategy for Sustainable Livestock Production in the Tropics. 2nd Edn., CONDRIT Ltd, Cali, Colombia, pp: 94.

Rosler, D.K., J.D. Ferguson, C.J. Sniffen and J. Herrema, 1993. Dietary protein degradability effects on plasma and milk urea nitrogen and milk protein nitrogen in Holstein cows. J. Dairy Sci., 76: 525-534.
Direct Link  |  

SAS, 1996. SAS/STAT User's Guide, Version 6.12 4th Edn., SAS Inst. Inc., Cary, NC.

Samuel, M., S. Sagathevan, J. Thomas and G. Mathen, 1997. An HPLC method for estimation of volatile fatty acids in ruminal fluid. Indian J. Anim. Sci., 67: 805-807.
Direct Link  |  

Satter, L.D. and L.L. Slyter, 1975. Effect of ammonia concentration on rumen microbial protein production in vitro. Br. J. Nutr., 32: 199-209.

Scott, G.J., M. Rosegrant and C. Ringler, 2000. Roots and Tubers for the 21st Century: Trends, Projections and Policy Options (Food, Agriculture and the Environment Discussion Paper 31). International Food Policy Research Institute, Washington, DC., USA., ISBN-13: 9780896296350, Pages: 64.

Wanapat, M. and A. Cherdthong, 2009. Use of real-time PCR technique in studying rumen cellulolytic bacteria population as affected by level of roughage in Swamp buffalo. Curr. Microbiol., 58: 294-299.
CrossRef  |  Direct Link  |  

Wanapat, M. and O. Pimpa, 1999. Effect of ruminal NH₃-N levels on ruminal fermentation, purine derivatives, digestibility and rice straw intake in swamp buffaloes. Asian-Aust. J. Anim. Sci., 12: 904-907.
CrossRef  |  Direct Link  |  

Wanapat, M., 2003. Manipulation of cassava cultivation and utilization to improve protein to energy biomass for livestock feeding in the tropics. Asian-Aust. J. Anim. Sci., 16: 463-472.
CrossRef  |  Direct Link  |  

Wanapat, M., A. Cherdthong, P. Pakdee and S. Wanapat, 2008. Manipulation of rumen ecology by dietary lemongrass (Cymbopogon citratus Stapf.) powder supplementation. J. Anim. Sci., 86: 3497-3503.
CrossRef  |  Direct Link  |  

Wanapat, M., S. Polyorach, K. Boonnop, C. Mapato and A. Cherdthong, 2009. Effects of treating rice straw with urea or urea and calcium hydroxide upon intake, digestibility, rumen fermentation and milk yield of dairy cows. Livest. Sci., 125: 238-243.
CrossRef  |  Direct Link  |  

Williams, P.E., C.A. Tait, G.M. Innes and C.J. Newbold, 1991. Effects of the inclusion of yeast culture (Saccharomyces cerevisiae plus growth medium) in the diet of dairy cows on milk yield and forage degradation and fermentation patterns in the rumen of steers. J. Anim. Sci., 69: 3016-3026.
PubMed  |  Direct Link  |  

van Soest, P.J., 1994. Nutritional Ecology of the Ruminant. 2nd Edn., Cornell University Press, Ithaca, New York, Pages: 476.