Comparative Study of the Effects of Two Dietary Sources of Vitamin D on the Bone Metabolism, Welfare and Birth Progress of Sows Fed Protein- and Phosphorus-Reduced Diets
Michael Lütke-Dörhoff | Jochen Schulz | Heiner Westendarp | Christian Visscher | Mirja R. Wilkens
To investigate the influence of two dietary sources of vitamin D on the vitamin D status, bone metabolism, welfare and birth progress of gestating and lactating sows, forty-nine multiparous sows were randomly assigned to one of two diets: “CON” (<i>n</i> = 25; 50 μg vitamin D<sub>3</sub>/kg feed) and “HYD” (<i>n</i> = 24; 50 μg 25-hydroxycholecalciferol/kg feed). The basal diets were protein- and phosphorus-reduced. The trial started on day 3 ante insemination of the sows and ended with weaning of the piglets on day 28 postpartum. Dietary supplementation of 25-hydroxycholecalciferol resulted in improved maternal vitamin D status (<i>p</i> < 0.001), fewer gait changes (<i>p</i> < 0.01) and longer standing time after feeding (day 5 ante partum; <i>p</i> < 0.05) compared to vitamin D<sub>3</sub>. However, the bone markers CrossLaps and osteocalcin were not affected. Overall, the present results suggest that sows fed 25-hydroxycholecalciferol instead of vitamin D<sub>3</sub> showed improved locomotion and stance strength. However, this outcome is probably not related to altered bone metabolism. The underlying mechanisms must be investigated in further studies.
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