Andrew S.M., Erdman R. A. and Waldo D. R. 1990. Extent and site of tissue protein and lipid mobilization
during the lactation cycle in dairy cattle. Page 82 in Proc. Maryland Nutr. Conf., Baltimore, MD. Univ.
Maryland, College Park.
AOAC. 1990. Official Methods of Analysis. 15th ed. Assoc. Offic. Anal.Chem., Arlington, VA.
Atwal A.S., Mahadevan J. S. and Wolynetz M.S. 1995. Increased Milk Production of Cows in Early
LactationFed Chemically Treated Soybean Meal.
Journal of Dairy Science,78:595-603.2.
Baker L.D., Ferguson J.D. and Chalupa W. 1995. Responses in urea and true protein of milk to different protein
feeding schemes for dairy cows.
Journal of Dairy Science,78:2424–2434.
Bruckental I., Abramson S., Zamwel S., Adin G. and Arieli A .2002. Effects of dietary undegrable crode protein
level on total non-structural carbohydrate (TNC) digestibility, and milk yield and composition of dairy cows.
Livestock Production Science, 76:71–79.
Brzoska F. 2005. Effect of soybean meal protected with Ca salts of fatty acids on cows’ yield, protein and fat
components in milk and blood. Annals of Animal Science, 5: 111 – 123
Casper D.P. and Schingoethe D.J. 1989. Lactational responses of early lactation dairy cows to diets varying in
ruminal solubilities of carbohydrate and crude protein.
Journal of Dairy Science, 72:928–941.
Casper D.P., Schingoethe D.J. and Eisenbeisz W.A. 1990. Response of early lactation dairy cows fed diets
varying in source of nonstructural carbohydrate and crude protein. Journal of Dairy Science, 73:1039–1050.
Casper D.P., Schingoethe D.J., Brouk M.J. and Maiga H.A. 1994. Nonstructural carbohydrate and undegradable
protein sources in the diet: growth response of dairy heifers.
Journal of Dairy Science, 77:2595.
Casper D. P., Maiga H.A., Brouk M. J. and Schingoethe D.J. 1999. Synchronization of Carbohydrate and Protein
Sources on Fermentation and Passage Rates in Dairy Cows.
Journal of Dairy Science, 82:1779–1790.
Chiou P.W.S., Chen K.J., Kuo K.S., Hsu J.C. and Yu B. 1995 . Studies on the application of an undegradable
protein system to high yielding dairy cattle in Taiwan. Animal Feed Science and Technology, 54: 93-102.
Davidson S., Hopkins B.A., Diaz D. E., Bolt S., Brownie M.C., Fellner V. and Whitlow L.W. 2003. Effects of
amounts and degradability of dietary protein on lactation, nitrogen utilization, and excretion in early lactation
Holstein cows.
Journal of Dairy Science, 86:1681–1689.
Ferguson J.D., T. Blanchard D.T., Galligan, D.C., Hoshall and Chalupa W.1988. Infertility in dairy cattle fed a
high percentage of protein degradable in the rumen. Journal of the American Veterinary Medical Association,
192:659– 662.
Flis S.A. and Wattiaux M.A. 2005. Effects of Parity and Supply of Rumen-Degraded and Undegraded Protein on
Production and Nitrogen Balance in Holsteins.
Journal of Dairy Science, 88:2096-2106
Harstad O.M. and PrestlØkken E. 2000. Effective rumen degradability and intestinal indigestibility of individual
amino acids in solvent-extracted soybean meal (SBM) and xylose-treated SBM (SoyPass) determined in situ.
nimal Feed Science and Technology, 83, 31–47.
Ipharraguerre I. R. 2004. Nutritional strategies for optimizing nitrogen utilization by dairy cows. Ph.D.
University of Illinois, Urbana.
Ipharraguerre I. R. and Clark. J.H. 2005. Impacts of source and amount of crude protein on the intestinal supply
of nitrogen fractions and performance of dairy cows.
Journal of Dairy Science, 88: E22_E37.
Ipharraguerre I. R., Clark J.H. and Freeman D.E. 2005. Rumen fermentation and intestinal supply of products in
dairy fed rumen_protected soy products.
Journal of Dairy Science, 88 :2879.
Kalscheur K.F., Baldwin R.L., Glenn B.P. and Kohn R A. 2006. Milk Production of Dairy Cows Fed Differing
Concentrations of Rumen-Degraded Protein.
Journal of Dairy Science, 89:249–259.
Keery C.M. and Amos H.E. 1993. Effects of source and level of undegraded intake protein on nutrient use and
performance of early lactation cows.
Journal of Dairy Science, 76:499–513.
Khorasani G.R., De Boer G., Robinson B. and Kennelly J.J. 1994. Influence of dietary protein and starch on
production and metabolic responses of dairy cows.
Journal of Dairy Science, 77:813–824.
Losand B., Sanftleben P. and Wolf J. 1996. Pansenstabiles protein. Kraftfutter, 2: 65 – 71.
Mohamed D., Faverdin P. and Verite R. 2001. Efeects of the level and source of dietary protein on intake and
milk yield in dairy cows. Animal Research, 50:205.
Mansfield H R. and Stem M.D. 1994. Effects of soybean hulls and lignosulfonate-treated soybean meal on
ruminal fermentation in lactating dairy cows. Journal of Dairy Science, 76 (Suppl. 1):117.
Nakamura T., Klopfenstein T.J., Owen F.G., Britton R.A., Grant R.J. and Winowiski T.S. 1992. Nonenzymatically browned soybean meal for lactating dairy cows. Journal of Dairy Science, 75:3519
Nocek J. E. and Russell J. B. 1988. Protein and energy as an integrated system. Relationship of ruminal protein
and carbohydrate availability to microbial synthesis and milk production.
Journal of Dairy Science, 71:2070–
2107.
NRC. 2001. National Research Council. Nutrient Requirements of Dairy Cattle. Vol. 7th rev. ed. Natl. Acad.
Sci., Washington, DC.
Olmos Colmenero J.J. and Broderick G.A. 2006. Effect of Amount and Ruminal Degradability of Soybean Meal
Protein on Performance of Lactating Dairy Cows.
Journal of Dairy Science, 89:1635–1643.
Reynal S.M and Broderick G.A. 2005. Effect of Dietary Level of Rumen-Degraded Protein on Production and
Nitrogen Metabolism in Lactating Dairy Cows.
Journal of Dairy Science, 88:4045–4064.
Robinson P.H., McQueen R.E., and Burgess P.L. 1991. Influence of rumen undegradable protein levels on feed
intake and milk production of dairy cows.
Journal of Dairy Science, 74:1623–1631.
Santos FA.P., Santos J.E.P., Theurer C. B. and Huber J. T.1998. Effects of Rumen-Undegradable Protein on
Dairy Cow Performance: A 12-Year Literature Review.
Journal of Dairy Science, 81:3182–3213.
SAS Institute. 1997. SAS/STAT User’s Guide: Statistics. Version 6.12. SAS Institute, Inc., Cary, NC.
Schwab C.G., Bozak C.K., Whitehouse N.L. and Olson V. M. 1992. Amino acid limitation and flow to the
duodenum at four stages of lactation. 2. Extent of lysine limitation.
Journal of Dairy Science, 75:3503.
Windschitl P.M. and Stern M.D. 1988a. Evaluation of calcium lignosulfonate-treated soybean meal as a source
of rumen protected protein for dairy cattle.
Journal of Dairy Science, 71:3310–3322.
Windschitl P.M. and Stern M.D. 1988b. Effects of urea supplementation of diets containing lignosulfonatetreated
soybean meal on bacterial fermentation in continuous culture of ruminal contents.
Journal of Animal Science, 66:2948–2958.
.