Piglets are born with very low levels of vitamin D. Feed is the only source of vitamin D for pigs kept indoors, and the levels in feed are restricted by European legislation. We aimed to study the effect of lamps releasing ultraviolet type B (UVB) light on the vitamin D status (serum 25-hydroxyvitamin D) in sows and piglets in a Danish indoor herd. A randomized trial with a parallel group design was initiated with two groups receiving a daily UVB-dose of maximum 0.7 standard erythema dose (SED) or 1 SED, in addition to a control group. The three groups included in the study consisted of 15 sows and their 195 offspring. Blood samples were taken from the piglets and sows on day 1, 12, and 24. Results showed no difference between the groups in serum levels of 25(OH)D3 or vitamin D3 on day 1, with the mean (±SD) for piglets being 0.96 ± 0.26 ng/mL and 0.06 ± 0.04 ng/mL, respectively. For sows, the values were 16 ± 3 ng/mL 25(OH)D3 and 3 ± 0.8 ng/mL vitamin D3 on day 1. A significant difference (p < 0.001) in serum 25(OH)D3 between the groups receiving UVB light and the control group was observed on both day 12 and day 24. On day 24, the piglet control group had 5.5 ± 2 ng/mL 25(OH)D3 and 0.4 ± 0.2 ng/mL vitamin D3. For the UVB groups, the values were 21.6 ± 10. ng/mL 25(OH)D3 and 8.3 ± 2.5 ng/mL vitamin D3 for the 0.7 SED group and 19.5 ± 6.0 ng/mL 25(OH)D3 and 7.6 ± 3.4 ng/mL vitamin D3 for the 1 SED group. For the sows, the values were 25.6 ± 5.5 ng/mL 25(OH)D3 and 6.6 ± 1.2 ng/mL vitamin D3 for the control group, 66.7 ± 13.5 ng/mL 25(OH)D3 and 21.3 ± 2.9 ng/mL vitamin D3 for 0.7 SED group and 67 ± 15 ng/mL 25(OH)D3 and 25 ± 5 ng/mL vitamin D3 for the 1 SED. No significant difference was found between the two UVB groups for either piglets or sows. The use of lamps releasing UVB light is therefore suggested to be an efficient way to improve the vitamin D status of both sows and piglets.

中文翻译：

---

UVB光对仔猪和母猪维生素D状态的影响。

仔猪出生时维生素D含量很低。饲料是饲养在室内的猪的维生素D的唯一来源，而且饲料含量受欧洲法规的限制。我们旨在研究在丹麦室内群中母猪和仔猪中释放B型紫外线（UVB）的灯对维生素D状态（血清25-羟基维生素D）的影响。除对照组外，还开始了两组平行试验的随机试验，两组分别接受每日最大剂量为标准红斑​​0.7（SED）或1 SED的UVB剂量。研究中的三组包括15头母猪和195头后代。在第1、12和24天从仔猪和母猪中采集血样。结果显示，两组在第1天的血清25（OH）D3或维生素D3水平没有差异，仔猪的平均值（±SD）为0.96±0。分别为26 ng / mL和0.06±0.04 ng / mL。对于母猪，第1天的值是16±3 ng / mL 25（OH）D3和3±0.8 ng / mL维生素D3。接受UVB的两组之间血清25（OH）D3的显着差异（p <0.001）在第12天和第24天观察光，对照组。在第24天，仔猪对照组具有5.5±2ng / mL的25（OH）D3和0.4±0.2ng / mL的维生素D3。对于UVB组，0.7 SED组的值为21.6±10 ng / mL 25（OH）D3和8.3±2.5 ng / mL的维生素D3; 25（OH）D3为19.5±6.0 ng / mL的25（OH）D3和7.6±3.4 1 SED组的ng / mL维生素D3。母猪的25（OH）D3值为25.6±5.5 ng / mL，对照组的维生素D3值为6.6±1.2 ng / mL，25（OH）D3值为66.7±13.5 ng / mL，21.3±2.9 ng / mL 0.7 SED组使用维生素D3，1 SED使用67±15 ng / mL 25（OH）D3和25±5 ng / mL维生素D3。对于仔猪或母猪，两个UVB组之间没有发现显着差异。因此，建议使用释放UVB光的灯是改善母猪和仔猪维生素D状况的有效方法。