Mäenpää P H, Pirhonen A, Koskinen E
Dept. of Biochem., University of Kuopio, Finland.
J Anim Sci. 1988 Jun;66(6):1424-9. doi: 10.2527/jas1988.6661424x.
The effects of feeding two different vitamin-mineral concentrates on serum levels of vitamins A, E and D and some growth indicators were examined in 30 pregnant mares and 30 foals. One concentrate contained vitamins A and E and the other did not. Both contained vitamin D3. No differences (P greater than .05) in serum levels of retinol and alpha-tocopherol were observed between the feeding groups in the mares, whereas in the weanlings serum levels of dietary vitamins A and E increased (P less than .01) during late winter and early spring. However, the values did not increase to levels found in summer. Serum 25-hydroxyvitamin D levels were very low (compared with animals of other species) in October, decreased (P less than .05) in winter and increased somewhat during the spring. The decrease in January was more pronounced in horses receiving vitamin concentrates containing less vitamin D. These results are interpreted to indicate that, in Finland, the commonly used amounts of dietary vitamins A and E or their bioavailability in vitamin-mineral concentrates are not sufficient to maintain serum concentrations in winter even close to the levels found in horses on pasture. Vitamin D status of horses is difficult to study due to very low serum levels of 25-hydroxyvitamin D.
在30匹怀孕母马和30匹幼驹中，研究了饲喂两种不同维生素 - 矿物质浓缩物对血清中维生素A、E和D水平以及一些生长指标的影响。一种浓缩物含有维生素A和E，另一种则不含。两种都含有维生素D3。母马的饲喂组之间，视黄醇和α - 生育酚的血清水平未观察到差异（P大于0.05），而在断奶幼驹中，膳食维生素A和E的血清水平在冬末和早春有所升高（P小于0.01）。然而，这些值并未升至夏季时的水平。10月份血清25 - 羟基维生素D水平非常低（与其他物种的动物相比），冬季下降（P小于0.05），春季有所升高。1月份的下降在接受维生素D含量较低的维生素浓缩物的马匹中更为明显。这些结果被解释为表明，在芬兰，膳食中常用量的维生素A和E或它们在维生素 - 矿物质浓缩物中的生物利用度不足以在冬季维持血清浓度，甚至接近在牧场饲养马匹中的水平。由于血清25 - 羟基维生素D水平非常低，马的维生素D状态难以研究。
