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Journal of Dairy Science Vol. 49 No. 2 193-194
© 1966 by American Dairy Science Association ®
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Blood Urea Nitrogen in Guernsey Cattle

A. G. Lane and J. R. Campbell

Department of Dairy Husbandry, University of Missouri, Columbia1

ABSTRACT

The blood urea nitrogen of 236 Guernsey cows was measured in each quarter for 2 yr. The 12-month mean was 11.83 mg per 100 ml blood plasma (range-2.9 to 22.4). Seasonal changes showed a significant (P < .005) peak in the spring corresponding to pasture; whereas, the lows were observed in the winter months. Advancing age and pregnancy were associated with a decline in blood urea nitrogen. There was no significant (P < .05) difference in mean blood urea nitrogen among daughters of seven sires.

FOOTNOTES

1 Contribution from Missouri Agricultural Experiment Station Journal Series no. 3025. Approved by the Director.






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Copyright © 1966 by the American Dairy Science Association ®.