Association of immediate postpartum plasma calcium concentration with early-lactation clinical diseases, culling, reproduction, and milk production in Holstein cows
| Autor: | M. J. Thomas, T. R. Overton, R.C. Neves, M.D. Curler, B. M. Leno, Jessica A.A. McArt |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
New York Cattle Diseases Culling Cohort Studies 03 medical and health sciences Animal science Pregnancy Retained placenta Lactation Genetics medicine Animals Prospective Studies Metritis Mastitis Bovine Hypocalcemia business.industry Reproduction Postpartum Period 0402 animal and dairy science food and beverages 04 agricultural and veterinary sciences medicine.disease 040201 dairy & animal science Mastitis Parity Milk 030104 developmental biology medicine.anatomical_structure Herd Calcium Cattle Female Animal Science and Zoology business Placenta Retained Postpartum period Food Science |
| Zdroj: | Journal of Dairy Science. 101:547-555 |
| ISSN: | 0022-0302 |
| Popis: | The objective of this study was to evaluate the association of postpartum plasma Ca concentration with early-lactation disease outcomes, culling within 60 d in milk, pregnancy to first service, and milk production. A total of 1,453 cows from 5 commercial dairy farms in New York State were enrolled in a prospective cohort study from February to November 2015. Blood samples were collected within 12 h of parturition, and plasma was submitted to a diagnostic laboratory for total Ca measurement. Early-lactation disease, reproductive performance, and milk production from Dairy Herd Improvement Association (DHIA) test-day data were compiled from each farm's management software. Multivariable Poisson regression models were built to evaluate the association of plasma Ca with the risks of retained placenta (RP), metritis, displaced abomasum (DA), clinical mastitis, culling within 60 d in milk, and pregnancy to first service. Repeated-measures ANOVA were used to evaluate the association of Ca at parturition with milk production across the first 9 DHIA tests. Herd was considered a random effect in all models. Primiparous cows were modeled separately from multiparous cows if differential responses were observed. Calcium was not associated with the risk of RP, metritis, clinical mastitis, or pregnancy to first service in primiparous or multiparous cows. For multiparous cows only, higher Ca concentration tended to be associated with increased culling within the first 60 d in milk. Multiparous cows with Ca ≤1.85 mmol/L had an increased risk of being diagnosed with a DA compared with cows with Ca >1.85 mmol/L. For the milk production models, Ca was not associated with the amount of milk produced within the first 9 DHIA tests in primiparous cows; however, multiparous cows with Ca ≤1.95 mmol/L produced, on average, 1.1 kg more milk per day across the 9 DHIA tests than their multiparous counterparts with Ca >1.95 mmol/L. Our results indicate that plasma Ca concentration measured within 12 h of parturition is a poor predictor of early-lactation health outcomes. Reduced Ca concentration in the immediate postpartum period was associated with higher milk production in multiparous cows. From these results, we caution that studies attempting to categorize subclinical hypocalcemia based on a single sample in the immediate postpartum period could misclassify the disorder. |
| Databáze: | OpenAIRE |
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