Table 6 Uterine diameter in sows day 3, 5, 7 and once between day 23 and 25 after farrowing of the two study groups C = negative control group, received no feed additive and 1,25-vitD = 1,25-vitD group, received a defined amount of 1,25-dihydroxyvitamin D3-glycosides: 1th to 84th gestation day: 26 g 1,25-vitD per day; 85th gestation day until farrowing: 30 g 1,25-vitD per day; during the lactation period: 70 g 1,25-vitD per day) No significant differences between the two groups were observed

From: Effect of 1,25-dihydroxyvitamin D3-glycosides on postpartum health, uterine involution and litter performance of sows in a free farrowing system