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Blood Levels of some Inorganic and Organic Constituents in Normal Parturient Cows and Cows with Parturient Paresis^{1, 2, 3,}

ABSTRACT

The literature on parturient paresis contains many reports concerning the levels of blood constituents occurring prior to or during the attacks of this disease. It is well established that a decrease of calcium and phosphorus and an increase of magnesium in the blood are characteristic of milk fever. Studies of the organic constituents in the blood associated With the disease have been few and limited to a small nu/hber of cows. The literature on milk fever has recently been reviewed in great detail by Hibbs (5) in this journal; therefore, it is unnecessary to review the literature in this paper.

Experimental Methods

All the cows in this experiment were from the dairy herd of The State College of Washington. All the cows described as having milk fever were diagnosed by a veterinarian as having typical parturient paresis. A blood sample was drawn from the external jugular vein immediately before treatment. Heparin was used as the anticoagulant in those samples on which whole blood analyses were made.

¹ This investigation was supported in part by funds provided for biological and medical research by The State of Washington Initiative Measure No. 171.

² These data were taken in part from a thesis presented by the senior author to the faculty of The State College of Washington in partial fulfillment of the requirements for the Doctor of Philosophy degree.

³ Scientific Paper No. 1145, Washington Agricultural Experiment Station, Pullman, Project No. 1053.

⁴ Department of Dairy Husbandry.

⁵ Division of Industrial Research.

⁶ Present position: Extension Dairyman, Kansas State College, Manhattan.