PSXVI-25 Excess dietary calcium failed to induce hypocalcemia in multiparous sows during the peripartum period
| Autor: | M Grez Capdeville, T. D. Crenshaw |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Journal of Animal Science. 96:333-333 |
| ISSN: | 1525-3163 0021-8812 |
| DOI: | 10.1093/jas/sky404.733 |
| Popis: | Hypocalcemia is a presumed predisposing factor for peripartum uterine prolapses in sows. Limited data are available to support peripartum hypocalcemia in sows fed diets with recommended or excessive Ca. Excess dietary Ca is implicated with hypocalcemia in periparturient dairy cows. The current objective was to assess peripartum hypocalcemia in sows fed excess Ca during late gestation. Twelve crossbred (Large White X Landrace), multiparous sows were randomly assigned to either control (Ctr; 0.65% Ca, 0.60% P) or high Ca (HCa; 1.75% Ca, 0.70% P) diets from gestation day 90 through a 25-d lactation period. On gestation day 112 indwelling venous catheters were placed and blood was collected at 15-min intervals within 4 designated hours (0700, 1000, 1300, and 1700) on gestation day 113 and lactation days 1, 3, and 5. Mixed model procedures with minute and day as repeated variables within sows were used to assess diet effects for blood traits. Blood ionized Ca(2+) and total serum Ca concentrations were greater (P < 0.01) in sows fed HCa vs. Ctr diets at each collection, but hypocalcemia (serum Ca < 8.0 mg/dL) was not detected. Ionized Ca(2+) represented approximately 50% of total serum Ca at all periods. Serum P concentrations were reduced (P < 0.01) in sows fed HCa vs.Ctr diets (5.95 vs. 3.50 mg/dL). Reduction in serum P was more evident as lactation progressed. Diet differences were not detected in blood gases (pH, pO(2), pCO(2), and HCO(3)(-)), electrolytes (K(+), Na(+), and Cl(-)), or blood glucose and lactate concentrations. No uterine prolapse occurred in any sow. In conclusion, hypocalcemia was not observed in periparturient sows fed HCa diets. Conversely, sows fed excess Ca presented hypophosphatemia (serum P < 4.0 mg/dL). Future efforts should focus on factors other than hypocalcemia to identify predisposing causes of uterine prolapses in sows. |
| Databáze: | OpenAIRE |
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