van Hellemond K K, Sprietsma J E
Tijdschr Diergeneeskd. 1979 Jul 1;104(13):543-9.
The anaemia resulting from iron deficiency is described as hypochromic in the medical literature. In the veterinary literature, anaemia of veal calves is usually regraded as normochromic. In order to examine the correctness of this view, the present authors studied the Hb and haematocrit (Hc) levels of the blood of veal calves in a comparative feeding trial for sixteen weeks. Three groups of male Dutch-Friesian calves, each group consisting of approximately thirty animals, were fed a milk replacer which contained 5, 10 or 25 ppm of iron respectively. The calculated mean Hb-concentration in the erythrocytes of the animals given 5 and 10 ppm of iron dropped during the trial period to below levels occurring at the age of two weeks. In the group given 25 ppm of iron, the erythrocyte Hb showed a rapid increase from the age of ten weeks and continuing throughout the rest of the trial period. At the age of sixteen weeks, the groups showed significant differences (P less than 0.01) in their mean erythrocyte Hb-concentrations. In veal calves, fed milkreplacers having an iron content below 25 ppm of Fe, the anaemia therefore is hypochromic.
医学文献中将缺铁导致的贫血描述为低色素性贫血。在兽医文献中，犊牛贫血通常被归类为正色素性贫血。为了检验这一观点的正确性，本文作者在一项为期16周的比较饲养试验中研究了犊牛血液中的血红蛋白（Hb）和血细胞比容（Hc）水平。将三组雄性荷兰弗里西亚犊牛，每组约30头，分别喂食含铁量为5 ppm、10 ppm或25 ppm的代乳品。在试验期间，摄入5 ppm和10 ppm铁的动物红细胞中计算出的平均血红蛋白浓度降至两周龄时的水平以下。在摄入25 ppm铁的组中，红细胞血红蛋白从10周龄开始迅速增加，并在试验期的其余时间持续增加。在16周龄时，各组的平均红细胞血红蛋白浓度存在显著差异（P小于0.01）。因此，在喂食铁含量低于25 ppm的代乳品的犊牛中，贫血是低色素性的。
