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Journal of Dairy Science Vol. 57 No. 1 49-55
© 1974 by American Dairy Science Association ®
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Effects of Calcium to Phosphorus Ratio in the Diet of Dairy Cows on Incidence of Parturient Paresis1

D. C. Beitz, D. J. Burkhart2 and N. L. Jacobson

Department of Animal Science, Iowa State University, Ames 50010

ABSTRACT

Nineteen Jersey and three Ayrshire cows (26 parturitions, second lactation and beyond) were allotted to two groups according to lactation number, milk production, and previous incidence of parturient paresis. Twelve cows were fed (for periods up to 12 mo before parturition) a complete feed of corn silage and concentrate with a calcium-to-phosphorus ratio of 1.1:1. The other cows were fed similarly except that calcium carbonate was added to increase the calcium-to-phosphorus ratio to 2.3:1. In 7 of the 14 parturitions of cows fed the 1.1:1 diet and in 9 of the 12 fed the 2.3:1 diet, treatment for parturient paresis was required. The length of time the diets were fed before parturition had no obvious effect on incidence of parturient paresis. Plasma calcium and inorganic phosphorus were lower from 48 h prepartum to 48 h postpartum in paretic than in nonparetic cows. Nonparetic cows fed the 2.3:1 diet had a higher plasma calcium concentration from 48 h to 4 wk postpartum than did nonparetic cows fed the 1.1:1 diet. There were no other significant dietary effects on plasma calcium, magnesium, or phosphorus.

FOOTNOTES

1 Journal Paper No. J-7386 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project 1910. The work was supported in part by funds provided by Moorman Manufacturing Company, Quincy, Illinois.

2 Present address: Fayette County Extension Office, Fayette, Iowa.






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Copyright © 1974 by the American Dairy Science Association ®.