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Journal of Dairy Science Vol. 83 No. 11 2438-2440
© 2000 by American Dairy Science Association ®
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Short Communication: Associations Between Blood Calcium Status at Calving and Milk Yield in Dairy Cows

S. Østergaard 1 and T. Larsen 1

1 Danish Institute of Agricultural Sciences, Department of Animal Health and Welfare, Research Centre Foulum, PO Box 50, DK-8830 Tjele, Denmark

The purpose of the present study was to estimate the effect of total blood plasma calcium (TBPCC) concentration at calving on milk yield in dairy cows. Data originated from 153 dairy cows in 27 herds from a single veterinary practice. For each cow, data included calcium concentration in a blood sample taken within 12 h postpartum, monthly test-day milk yield until 300 d in milk, calving date, parity, breed, and herd. The TBPCC ranged from 0.69 to 2.73 mmol/L, with a mean value of 1.80 mmol/L. The statistical analysis adjusted for the fixed effects of parity and lactation stage, random effects of herd and cow, and the correlation between repeated measures of test-day milk yield. The results showed that TBPCC at calving was not significantly related to fat- and protein-corrected milk yield at any lactation period. The present study indicates that hypocalcemia (low TBPCC) at calving is not an important risk factor for decreased milk yield.

Key Words: blood plasma concentration • hypocalcemia • milk yield

Submitted on February 1, 2000
Accepted on May 31, 2000






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