The movement to total confinement of swine limits the amount of sunlight pigs are exposed to and therefore the amount of endogenous vitamin D that is produced. Although swine diets are supplemented with dietary cholecalciferol, swine herds in the Midwest are reporting weaned pig serum 25-hydroxy cholecalciferol (25(OH)D3) levels below the published values of25-30 ng/mL for weaned pigs. Goff et al. (1984) demonstrated that plasma concentrations of 25(OH)D_3 were highly correlated between the sow and the piglet at birth. Witschi et al. (2011) demonstrated that vitamin D (50 mu g/kg of feed) fed to sows and pigs in the form of either 25(OH)D_3 or cholecalciferol resulted in a tendency for improved growth post-weaning. Therefore, the objective of this study was to determine if oral supplementation of vitamin D_3 (Wean-D) to suckling pigs would improve 25(OH)D3 serum levels at the time of weaning and improve nursing piglet performance.
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机译：猪的总禁闭的运动限制了阳光猪的量暴露在一起，因此产生的内源性维生素D的量。虽然猪饮食补充有膳食胆碱紫外线，但中西部的猪群正在报告断奶猪血清25-羟基胆碱（25（OH）D3）水平，低于25-30 ng / ml的断奶猪。 Goff等人。 （1984）证明了25（OH）D_3的血浆浓度在出生时母猪和仔猪之间的高度相关性。 Witschi等人。 （2011）证明，维生素D（50μg/ kg饲料）饲喂25（OH）D_3或Cholecalciferol的形式的母猪和猪导致改善了断奶后生长的趋势。因此，本研究的目的是确定在断奶时改善维生素D_3（WEAN-D）对乳酸的口服补充，改善25（OH）D3血清水平，提高护理仔猪性能。
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