Blood Calcium and Phosphorus Relationships in the Parturient Paresis Syndrome in Mature Holstein Cows

Abstract

An observational study was conducted in 79 mature Holstein cows from 28 dairy farms selected from Ontario Veterinary College, Ruminant Field Service clients that participated in a monthly herd health program. The objectives were to measure and describe the serum levels of calcium and phosphorus, to evaluate the relationships between these two values in the parturient paresis syndrome of dairy cows and to find specific cut-off values to better predict clinical milk fever cows. All eligible third plus lactation cows entered the study if the calving occurred between February 15 and May 15, 1992. All cows were examined within the first 24 hours after parturition by a farm service clinician. A standard questionnaire and physical examination sheet was completed for every cow. At the end of the evaluation, a serum sample was taken from the caudal vein with a vacutainer vial.