AOAC. 1990. Official Methods of Analysis (15th Ed.) Association of Official Analytical Chemists. Washington, DC.
Armentano, L. E. and R. W. Russell. 1985. Method for calculating digesta flow and apparent absorption of nutrients from nonrepresentative samples of digesta. J. Dairy Sci. 68:3067-3070.
Bhattacharya, A. N. and J. C. Taylor. 1975. Recycling animal waste as a feedstuff: A review. J. Anim. Sci. 41:1438-1457.
Briggs, H. M. and M. D. Gallup. 1949. Metabolism stalls for wethers and steers. J. Anim. Sci. 8:480-482.
CAST. 1978. Feeding Animal Waste. Report No. 75. Council for Agricultural Science and Technology, Ames, IA.
Chaney, A. L. and E. P. Marbach. 1962. Modified reagents for the determination of urea and ammonia. Clin. Chem. 8:130-132.
Chester-Jones, H. and J. P. Fontenot. 1981. Growing cattle fed different levels of ensiled and deepstacked broiler litter. Va. Agric. Exp. Sta. Anim. Sci. Res. Rep. No. 1:178-182.
Coulombe, J. J. and L. Favreau. 1963. A new semi−micro method for colorimetric determination of urea. Clin. Chem. 9:102-108.
de Faria, V. P. and J. T. Huber. 1984. Effect of dietary protein and energy levels on rumen fermentation in Holstein steers. J. Anim. Sci. 58:452-459.
Fonnesbeck, P. V., J. L. Christiansen and L. E. Harris. 1981. Factors affecting digestibility of nutrients by sheep. J. Anim. Sci. 52:363-376.
Goering, H. K. and P. J. Van Soest. 1970. Forage fiber analyses (apparatus, reagents, procedures and some application). ARS, USDA, Agric. Handbook 379. Washington, DC.
Hern, J. L. 1979. Elemental analysis in agriculture using inductively coupled plasma−atomic emission spectroscopy. Pages 23-33 in (Ed. R. M. Barnes). Applications of Plasma Emission Spectrochemistry. Heyden and Sons, Philadelphia.
Koenig, S. E. 1980. Microbial purines and pyrimidines as indicators of rumen microbial synthesis. Ph. D. Dissertation. University of Kentucky, Lexington.
Kwak, W. S., J. P. Fontenot and J. H. Herbein. 1998. Effect of processing method on ruminal solubility and degradability of broiler litter. Bioresource Technology 66:13-18.
Kwak, W. S., S. C. Roh and J. M. Park. 2000. Feeding of poultry wastes to cattle in Korea. Asian-Aust. J. Anim. Sci. 13(Suppl.):175-177.
Lewis, T. R. and R. S. Emery. 1962. Intermediate products in the catabolism of amino acids by rumen microorganisms. J. Dairy Sci. 45:1363-1368.
Li, Y., D. Li, J. Xing, S. Li, Y. Han and I. K. Han. 2002. Effects of supplementing different combinations of nitrogen supplements on digestibility and performance in sheep fed wheat straw diets. Asian-Aust. J. Anim. Sci. 15(10):1428-1432.
Nocek, J. E. and C. E. Polan. 1984. Influence of ration form and nitrogen availability on ruminal fermentation patterns and plasma of growing bull calves. J. Dairy Sci. 67:1038.
NRC. 1985a. Nutrient Requirements of Sheep (6th Ed.). National Academy Press, Washington, DC.
NRC. 1985b. Ruminant Nitrogen Usage. National Academy Press. Washington, DC.
Ortigues, I., J. P. Fontenot and J. G. Ferry. 1988. Digesta flows in sheep fed poor−quality hay supplemented with urea and carbohydrates. J. Anim. Sci. 66:975-985.
Rihani, N., W. N. Garrett and R. A. Zinn. 1993. Influence of level of urea and method of supplementation on characteristics of digestion of high−fiber diets by sheep. J. Anim. Sci. 71:1657-1665.
Ruffin, B. G. and T. A. McCaskey. 1990. Broiler litter can serve as a feed ingredient for beef cattle. Feestuffs 62(15):13-17.
SAS Institute, Inc. 1990. SAS User’s Guide, Version 6.08, 4th ed., SAS Inst., Inc., Cary, NC.
Schelling, G. T. and F. M. Byers. 1984. Cytosine as a marker for microbial nitrogen leaving the rumen. Can. J. Anim. Sci. 64 (Suppl.):52.
Seymour, W. M., C. E. Polan and J. H. Herbein. 1992. In vivo degradation of protein in diets formulated for two degradabilities. J. Dairy Sci. 75:2447-2453.
Sultan, J. I. and S. C. Loerch. 1992. Effects of protein and energy supplementation of wheat straw−based diets on site of nutrient digestion and nitrogen metabolism of lambs. J. Anim. Sci. 70:2228-2234.
Uden, P., P. E. Colucci and P. J. Van Soest. 1980. Investigation of Chromium, Cerium and Cobalt as markers in digesta. Rate of passage studies. J. Sci. Food Agric, 31:625-632.
Van Soest, P. J. and J. B. Robertson. 1976. Composition and nutritive value of uncommon feedstuffs. Cornell Nut. Conf. pp. 102−111. Ithaca, NY.