, , . () .
, :
545
682.
500 ■
682
454
568
:
= 0.06275 .
REFERENCTS 16
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Dann. H.M., K. Drackley, G. McCoy, M. F. Hutjens, and J. E. Garrett.2000. Effect of yeast culture (Saccharomvces cereviciae) on prepartum intake and postpartum intake and milk production of Jersey cows. J. Dairy Sci. 83:123-127/
Dhiman, T. R.., and L. D. Satter, 1993. Protein as the first limiting nutrient for lactating dairy cows fed high proportions of good quality alfalfa silage. J. Dairy Sci. 76:1960-1971/
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E. Russek Cohen. 1999. Effects of dietary crude protein concentration and degradability on milk production responces of early, mid and late lactation dairy cows. J. Dairy sci. 82:545-554/
Khorasani, G.R., G. D. Boer, and J. J. Kennelly. 1996. Response of early lactation cows to ruminally undegradable protein in the diet/ J/ Dairy Sci. 79:446-453/
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Mowrey, A., M. R. Ellersieck, and J.N. Spain. 1999. Effect of fibrous by-products on production and ruminal fermentation in lactating dairy cows. J. Dairy Sci. 82: 2709-2715/
National Research Council. 1989. Nutrient Requirements of Dairy Cattle, 61'1 rev. ed., Washington, DC: National Academy Press.
Overton, T.R., L. S. Emmert. and J.H. Clark. 1998. Effects of source of carbohydrate and protein and rumen-protected methionine on performance of cows. J. Dairy Sci. 81: 221-228.
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Santos, F. A. P., J. T. Huber, . . Theurer, R.S. Swingle, J. M. Simas, . . Chen, and P. Yu. 1998. Milk yield and composition of lactating cows fed steam-flaked sorghum and graded concentrations of ruminally degradable protein. J. Dairy Sci. 81:215-220/
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