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- Title
Evaluation of high concentrations of non-esterified fatty acids in plasma around parturition as a risk factor for occurrence of subclinical ketosis.
- Authors
Juchem, S. O.; Santos, J. E. P.; Cerri, R. L. A.; DePeters, E. J.; Villaseñor, M.
- Abstract
Data from two studies conducted in different dairy farms in the Central Valley of California were compiled in order to investigate the relationships between high plasma NEFA concentrations and the incidence of sublcinical ketosis. Cows that had at least one plasma sample with concentration of B-hydroxybutyrate (BHBA) above 1.4mMol/L during the first 4 wk of lactation were considered positive. Data from 85 primiparous cows were obtained from study 1, while study 2 provided information from 175 primiparous (P) and 290 multiparous (M) cows. Concentrations of plasma NEFA were categorized for P (<0.50, 0.50 to 0.65, and >0.65 mMol of NEFA/L) and M cows (<0.46, 0.46 to 0.90 and >0.90 mMol of NEFA/L) according to concentrations at the first week postpartum. The mean (0.834 and 0.819 mMol /L) and median (0.749 and 0.754 mMol/L) concentrations of NEFA in plasma at one week postpartum were similar for P cows across study 1 and 2, respectively. Mean and median for M cows in study 2 were 0.865 and 0.787 mMol/L of NEFA, respectively. A logistic regression model that included the effects of NEFA category and study was utilized, while the two parity groups were analyzed separately. Concentration of NEFA in the first week of lactation had a major impact (P < 0.01) on the incidence of subclinical ketosis. Primiparous cows that had concentrations of NEFA in plasma greater than 0.65 mMol/L (n=154) at week 1 postpartum were 7.6 (OR) times more likely to experience high plasma concentrations of BHBA during the first 28 d in milk than herdmates in the < 0.50 mMol category group (n=47). Similar result was observed for M (OR=5.0; P <0.01) cows. Incidence of subclinical ketosis in the lower category group was 25.5 and 40.7%, for P and M, respectively. Management and nutritional practices that can alleviate the peak of NEFA could be a useful management tool to decrease the incidence of subclinical ketosis in early lactation.
- Subjects
CENTRAL Valley (Calif. : Valley); CALIFORNIA; ACETONEMIA; FATTY acids; DAIRY farms; PARTURITION; LOGISTIC regression analysis; COWS
- Publication
Journal of Animal Science, 2006, Vol 84, p9
- ISSN
0021-8812
- Publication type
Article