28 Serum 25-OH D3 concentration changes in sows as a result of 25-OH D3 addition and mineral source

Abstract Abstract: Introduction Vitamin D is essential for growth and development including processes beyond those associated with bone. Vitamin D status can be low in reproducing sows. The vitamin D receptor is a Zn dependent receptor. Thus available mineral may be necessary to optimize vitamin D status. Objective Assess impact of mineral source fed during gestation and lactation on sow serum 25-OH D3 concentration. Methods Thirty-two multiparous sows (16 reps/treatment) were fed 100 ppm Zn, 20 ppm Cu and 40 ppm Mn either solely in the hydroxy form (ITM), or, as a 50:50 blend of metal methionine hydroxy analogue bis-chelate minerals and ITM (MHAC:ITM). All diets were supplemented with 50 mcg/kg 25-OH D3 and 1,000 FTU/kg phytase. Sows had not previously received 25-OH D3. Serum samples were obtained at insemination, gestation d-103, and 21-d post-farrow and analyzed for 25-OH D3 concentration. Results At breeding serum 25-OH D3 averaged 26.4 ng/ml (P = 0.20). Breeding 25-OH D3 was used as a covariate. Day 103 25-OH D3 was 47.0 and 40.4 ng/ml for ITM and MHAC:ITM respectively (P = 0.20). Weaning 25-OH D3 was 78.2 ng/ml for MHAC:ITM which tended (P < 0.10) to be greater than the 66.3 ng/ml in ITM serum. The d-103 to weaning rise in 25-OH D3 tended (P < 0.10) to be greater in MHAC:ITM (+16.5 ng/ml) than ITM (+4.5 ng/ml). Conclusion Supplementing 50 mcg/kg 25-OH D3 can increase vitamin D status within 1 parity. A MHAC:ITM blend fed throughout gestation and lactation tended to result in a greater weaning serum 25-OH D3.