Kolb E, Dittrich H, Dobeleit G, Schmalfuss R, Siebert P, Stäuber E, Wahren M
Wissenschaftsbereich Tierbiochemie und dem Wissenschaftsbereich Rinder- und Pferdezucht, Universität Leipzig.
Berl Munch Tierarztl Wochenschr. 1991 Dec 1;104(12):423-7.
Analyses of the liver of bulls of different age show, that the concentration of beta-carotene in the age of 6 to that of 25 weeks increased only from 0.43 +/- 0.16 to 1.66 +/- 0.27 and that of vitamin A from 11.49 +/- 5.87 to 13.90 +/- 5.21 micrograms/g fresh weight. The concentration of beta-carotene and of vitamin A in the testis of bulls and of short scrotum bulls up to an age of 15 weeks was similar; thereafter the concentration in the short scrotum bulls was higher. At an age of 72 weeks the concentration of vitamin A in the liver of bulls (219.17 +/- 51.86) was higher (p less than 0.01) than in that of the short scrotum bulls (144.11 +/- 27.79) and that of the oxen (135.51 +/- 41.26 micrograms/g fresh weight). Analyses of the concentration of ascorbic acid in 8 different tissues of bulls and short scrotum bulls at 6 various periods show, that the highest values mostly were found in December.
对不同年龄公牛肝脏的分析表明，6至25周龄时，β-胡萝卜素的浓度仅从0.43±0.16增加到1.66±0.27，维生素A的浓度从11.49±5.87增加到13.90±5.21微克/克鲜重。15周龄前，公牛和短阴囊公牛睾丸中β-胡萝卜素和维生素A的浓度相似；此后，短阴囊公牛中的浓度更高。72周龄时，公牛肝脏中维生素A的浓度（219.17±51.86）高于短阴囊公牛（144.11±27.79）和牛（135.51±41.26微克/克鲜重）（p＜0.01）。对6个不同时期公牛和短阴囊公牛8种不同组织中抗坏血酸浓度的分析表明，最高值大多出现在12月。
