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Journal of Dairy Science Vol. 53 No. 12 1709-1713
© 1970 by American Dairy Science Association ®
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Feeding Encapsulated Methionine Supplement to Lactating Cows1,2,3,

L. R. Williams, F. A. Martz and E. S. Hilderbrand

Department of Dairy Husbandry, University of Missouri, Columbia 65201

ABSTRACT

Twenty lactating Holstein cows were fed individually and were randomly assigned to 4 treatment groups in a continuous 120-day trial. The study was to determine the effects of methionine supplementation at 12g per day and of feeding methionine supplement more frequently than twice daily. Treatment 2x was twice daily feeding; 2xM, twice daily feeding plus methionine; 4x was 4 feedings daily, and 4xM was 4 feedings daily plus methionine. Average daily fat-corrected milk production, milk fat, milk protein, and ration intake by treatments were: 2x) 19.21kg, 3.49%, 3.56%, 16.42kg; 2xM) 18.22kg, 3.72% 3.49%, 15.59kg; 4x) 17.56kg, 3.60%, 3.41%, 15.11kg; and 4xM) 17.37kg, 3.43%, 3.47%, 13.88kg. Analysis of co-variance indicated no significant differences (P < .05) for daily fat-corrected milk production, milk composition, and feed intake. No significant differences were found in urinary urea nitrogen, urine volume, urinary nitrogen, creatinine, urinary amino acids, or blood ammonia. The 4x group had higher blood urea nitrogen values than other groups. The 4x and 4xM groups appeared to have lower methionine-to-valine ratios than the 2x and 2xM groups at the end of the trial. Feeding encapsulated methionine at 12g per day showed no benefit for increasing fat-corrected milk production.

FOOTNOTES

1 Encapsulated methionine product donated by Delmar Chemicals Limited, Box 6290, Montreal 101, Canada.

2 Contribution from the Missouri Agricultural Experiment Station. Journal Series no. 5855, Approved by the Director.

3 This study was supported in part by funds donated by Farmland Industries, Kansas City, Missouri.






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