Dierenfeld E S, Sheppard C D, Langenberg J, Mirande C, Spratt J, Dein F J
New York Zoological Society, Bronx 10460.
J Wildl Dis. 1993 Jan;29(1):98-102. doi: 10.7589/0090-3558-29.1.98.
Fat soluble vitamins E and A (quantified as alpha-tocopherol and all-trans retinol, respectively) were measured in plasma samples from 274 captive cranes from four institutions and five free-ranging birds. Ages ranged from 4 mo to 80 yr, and all 15 crane species were represented. Captive cranes had a mean +/- standard error (SE) of 6.57 +/- 0.82 micrograms/ml alpha-tocopherol; migrating greater sandhill cranes (Grus canadenis tabida) had a plasma concentration of 3.71 +/- 0.22 micrograms/ml. Sex and age differences were not significant, but crane species that evolved in temperate habitats had higher circulating levels of alpha-tocopherol than tropical or subtropical species. Mean +/- SE retinol values were 0.69 +/- 0.05 micrograms/ml in captive cranes, and 0.66 +/- 0.08 micrograms/ml in free-ranging cranes; values did not differ significantly by sex, age, or species. Dietary vitamin E concentrations were significantly correlated with plasma alpha-tocopherol levels in a logarithmic relationship. Dietary selenium at 0.5 mg/kg was associated with decreased circulating alpha-tocopherol concentrations.
在来自四个机构的274只圈养鹤以及五只自由放养鸟类的血浆样本中，测定了脂溶性维生素E和A（分别以α-生育酚和全反式视黄醇进行定量）。年龄范围从4个月到80岁，涵盖了所有15种鹤类。圈养鹤的α-生育酚平均含量±标准误差（SE）为6.57±0.82微克/毫升；正在迁徙的大沙丘鹤（Grus canadenis tabida）血浆浓度为3.71±0.22微克/毫升。性别和年龄差异不显著，但在温带栖息地进化的鹤类，其循环中的α-生育酚水平高于热带或亚热带物种。圈养鹤的视黄醇平均含量±SE为0.69±0.05微克/毫升，自由放养鹤为0.66±0.08微克/毫升；视黄醇含量在性别、年龄或物种方面无显著差异。膳食维生素E浓度与血浆α-生育酚水平呈对数关系，显著相关。膳食中0.5毫克/千克的硒与循环α-生育酚浓度降低有关。
