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Journal of Dairy Science Vol. 82 No. 10 2115-2120
© 1999 by American Dairy Science Association ®
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Evaluation of Ruminally Protected Methionine and Lysine or Blood Meal and Fish Meal as Protein Sources for Lactating Holsteins

H. G. Bateman II 1, J. N. Spain 1, M. S. Kerley 1, R. L. Belyea 1, and R. T. Marshall 2

1 Department of Animal Science, University of Missouri, Columbia 65211
2 Department of Food Science and Nutrition, University of Missouri, Columbia 65211

Forty lactating Holstein cows averaging 55 days in milk were used in a randomized block designed experiment to evaluate the effectiveness of ruminally protected Met and Lys compared with that of ruminally undegradable protein for supporting lactation. Cows were fed total mixed diets for 15 wk. Diets were formulated to be isonitrogenous with the same base ingredients resulting in base crude protein percentage of 15.5. Supplemental crude protein supplied by urea, soybean meal, or a 50:50 (wt/wt) mixture of fish and blood meal increased total dietary nitrogen to 18.0% of diet DM. Two additional diets consisted of the basal diets soybean meal and urea, which were supplemented with ruminally protected DL-Met and Lys-HCL at 10 and 25 g/d, respectively (soybean meal + amino acids (AA), urea + AA). Mean measures of dry matter intake, milk yield, milk protein percentage, and milk fat percentage were not affected by protein supplement. Milk protein yield, milk fat yield, casein yield, and casein percentage also were not affected by source of supplemental protein. Results indicate that at the level of crude protein intake relative to milk production in this experiment, the source of protein did not affect lactational performance.

Key Words: amino acids • protein • dairy cows

Submitted on June 26, 1998
Accepted on May 10, 1999




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L. M. Johnson-VanWieringen, J. H. Harrison, D. Davidson, M. L. Swift, M. A. G. von Keyserlingk, M. Vazquez-Anon, D. Wright, and W. Chalupa
Effects of Rumen-Undegradable Protein Sources and Supplemental 2-Hydroxy-4-(Methylthio)-Butanoic Acid and Lysine{middle dot}HCl on Lactation Performance in Dairy Cows
J Dairy Sci, November 1, 2007; 90(11): 5176 - 5188.
[Abstract] [Full Text] [PDF]


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