AOAC. 1990. Official methods of analysis. 15th edn. Association of official analytical chemists, Washington, DC., USA.
Balogun, R. O., R. J. Jones and J. H. G. Holmes. 1998. Digestibility of some tropical browse specie varying in tannin content. Anim. Feed Sci. Technol. 76:77-88.
Barry, T. N. 1989. Condensed tannin: their role in ruminant protein and carbohydrate digestion and possible effects upon the rumen ecosystem. In: The Roles of Protozoa and Fungi in Ruminant Digestion. (Ed. J. V. Nolan, R. A. Leng and D. I. Demeyer). Penambul Books, Armidale, Australia, pp. 153-169.
Broderick, G. A. and M. K. Clayton. 1997. A statistical evaluation of animal and nutritional factors influencing concentration of milk urea nitrogen. J. Dairy Sci. 80:2964-2971.
Burns, R. E. 1971. Method for estimation of tannin in grain sorghum. Agron. J. 63:511-512.
Buscaglia, H. J., H. M. van Es, L. D. Geohring, H. C. A. M. Vermeulen, G. W. Fick and R. F. Lucey. 1994. Alfalfa yield and quality are affected by soil hydrologic conditions. Agron. J. 86:535-542.
Cai, D. V., P. H. Hai, H. T. D. Trang, N. V. Tri, P. T. L. Dung and N. T. T. Van. 2000. Evaluate and improve the milk fat content of dairy cows kept in small household in Ho Chi Minh City in Vietnam. Annual report of IAS.
Cannas, A., A. Pes, R. Mancuso, B. Vodret and A. Nudda. 1998. Effect of dietary protein and protein concentration on the concentration of milk urea nitrogen in dairy ewes. J. Dairy. Sci. 81:499-508.
DePeters, E. L. and J. D. Ferguson. 1992. Nonprotein nitrogen and protein distribution in the milk of cows. J. Dairy Sci. 76:3742-3746.
Hof, G., M. D. Vervoorn, P. J. Lenaers and S. Tamminga. 1995. Milk urea nitrogen as a tool to monitor the protein nutrition of dairy cows. J. Dairy Sci. 80:3333-3340.
Hwang, S. Y., M. J. Lee and P. W. Chiou. 2000. Monitoring nutritional status of dairy cows using milk protein and milk urea nitrogen. Asian-Aust. J. Anim. Sci. 13:1667-1673.
Hwang, S. Y., M. J. Lee and H. C. Peh. 2001. Diurnal variation in milk and blood urea nitrogen and whole blood ammonia nitrogen in dairy cows. Asian-Aust. J. Anim. Sci. 14:1683-1689.
Khang, N. D. and H. Wiktorsson. 2000. Effect of cassava leaf meal on ruminant environment of yellow cattle fed urea-treated paddy straw. Asian-Aust. J. Anim. Sci. 13:1102-1108.
Leng, R. 1999. Feeding strategies for improving milk production. In smallholder Dairy in the tropics. (Ed. L. Falvey and C. Chantalakhana) ILRI (International Livestock Research Institute). Nairobi, Kenya. pp. 207-224.
McDonald, P., R. A. Edwards, J. F. D. Grennhalgh and C. A. Morgan. 1996. Animal Nutrition. Longman Singapore Publisher (Pte) Ltd, Singapore.
Moore, C. P. and J. H. Cock. 1985. Cassava foliage sillage as a feed source for Zebu calves in the tropic. Trop. Agric. 62:142-144.
Oltner, R. and H. Wiktorrson. 1983. Urea concentration in milk and blood as influenced by feeding vary in amounts of protein and energy to dairy cows. Livestock Production Science 10:457-467.
Oltner, R., M. Emanuelson and H. Wiktorrson. 1985. Urea concentration in milk relation to milk yield, live weight, lactation number and amout and composition of feed given to dairy cows. Livestock Production Science 12:47-57.
Petlum, A., M. Wanapat and S. Wanapat. 2001. Effects of planting space and cutting frequency on cassava hay yield and chemical composition. In: Proc. the international workshop on current research and development on use as cassava as animal feed, organized by Khon Kaen University and Swedish International Development Agency (SIDA) and Swdish Agency for Research and Cooperation with Developing Countries (SAREC), July 23-24, Kosa Hotel, Khon Kaen, Thailand.
Phuc, B. H. N., R. B. Ogle, J. E. Linberg and T. R. Preston. 1996. The nutritive value of sun-dried and ensiled cassava leaf for growing pigs. Livestock Research for Rural Development. 8(3): LRRD home page. http://www.vcn.vnn.vn.
Poungchompu, O., S. Wanapat, A. Polthanee, C. Wachirapakorn and M. Wanapat. 2001. Effects of planting method and fertilization on cassava hay yield and chemical composition. In: Proc. the international workshop on current research and development on use as cassava as animal feed, organized by Khon Kaen University and Swedish International Development Agency (SIDA) and Swdish Agency for Research and Cooperation with Developing Countries (SAREC), July 23-24, Kosa Hotel, Khon Kaen, Thailand.
Preston, T. R. and R. A. Leng. 1987. Matching Ruminant Production Systems with Available Resources in the Tropic and Sub-Tropics. Penambull Book Armidale, Australia.
SAS Institute Inc. 1998. SAS/STAT User’s Guide: Version 6.12th Edn. SAS Institute Inc., Cary, NC, USA.
Song, M. K. and J. J. Kennelly. 1989. In situ degradation of feed ingredients, fermentation pattern and microbial population as influenced by ruminal ammonia concentration. Can. J. Anim. Sci. 69:999-1006.
Song, M. K. and J. J. Kennelly. 1990. Ruminal fermentation pattern, bacterial population and ruminal degradation of feed ingredients as influenced by ammonia concentration. J. Anim. Sci. 68:1110-1120.
Tung, C. M., J. B. Liang, S. L. Tan, H. K. Ong and Z. A. Jelan. 2001. Fodder productivity and growth persistency of three local cassava varieties. Asian-Aust. J. Anim. Sci. 14:1253-1259.
Van Soest, P. J., J. B. Robesrtson and B. A. Lewis. 1991. Method for dietary fiber, neutral detergent fiber and nonstarch polysaccharide in relation to animal nutrition. J. Dairy Sci. 74:3583-3597.
Wanapat, M. and C. Devendra. 1999. Feeding and nutrition of dairy cattle and buffaloes in Asia. In Feeding of Ruminants in The Tropics Based on Local Feed Resources. (Ed. M. Wanapat). Khon Kaen publishing house company Ltd. Khon Kaen, Thailand. pp. 1-20.
Wanapat, M., A. Peltum and O. Pimpa. 2000a. Supplementation of cassava hay to replace concentrate use in lactating Holstein Friesian crossbreds. Asian-Aust. J. Anim. Sci. 13:600-604.
Wanapat, M., O. Pimpa, A. Petlum and U. Boontao. 1997. Cassava hay: A new strategic feed for ruminant during the dry season.
Livestock research for rural development. 9(2): LRRD home page. http://www.cipav.org.co/lrrd9/2/metha92
Wanapat, M., T. Puramongkon and W. Siphuak. 2000b. Feeding of cassava hay for lactating cows. Asian-Aust. J. Anim. Sci. 13: 478-482.