Bodurov N, Filipov Zh, Petrova L
Vet Med Nauki. 1979;16(5):35-40.
Comparative investigations aiming to determine the most favourable dose for in vitro ultraviolet irradiation of cow milk which can ensure highest vitamin D content in it and best effect on vitamin D level in calf blood serum were carried out. It was established that under the applied technique of ultraviolet irradiation a 4 min treatment is most suitable and vitamin D content in milk rises several times (up to 8 times). Feeding of calves up to the age of 60 days with irradiated milk ensures a 4- to 5-fold increase of vitamin D in the blood serum as compared to its initial level before the experiment started and 2--3 fold as compared to that in control group calves.
开展了对比研究，旨在确定牛乳体外紫外线照射的最适剂量，该剂量既能确保牛乳中维生素D含量最高，又能对犊牛血清中的维生素D水平产生最佳影响。结果表明，在所采用的紫外线照射技术下，4分钟的处理最为合适，牛奶中的维生素D含量会增加数倍（高达8倍）。用经辐照的牛奶喂养60日龄以下的犊牛，与实验开始前的初始水平相比，血清中的维生素D增加了4至5倍，与对照组犊牛相比增加了2至3倍。
