Bárdos L, Sótér G, Karchesz K
Department of Animal Physiology and Health, University of Agricultural Sciences, Gödöllö, Hungary.
Acta Vet Hung. 1996;44(2):213-9.
The ration fed to laying Japanese quails was supplemented either with retinyl acetate (RA) (50 x 10(3) IU/kg, group A), ascorbic acid (500 mg/kg, group C), or with both substances in combination with each other (group AC) and with tocopheryl acetate (37.8 IU/kg; groups AE and ACE). On days 1, 8, 14, 20 and 28, some quantitative parameters of eggs (mass of egg-shell, albumen and egg yolk, retinoid content of egg yolk) were measured. The egg production parameters were not significantly affected by the supplementations. By the end of the second week, the total vitamin A (retinyl esters + retinol) concentrations of the egg yolk were significantly higher in the groups receiving supplemented feed (AC, AE and AEC) than in the control group. Two weeks later (on day 28), the vitamin A levels were elevated significantly in all groups except the group treated with ascorbic acid. From the point of view of vitamin A fortification of the egg yolk, the combined supplementations (groups AC, AE, AEC) seem to be more effective. The results indicate that vitamin A content of the egg yolk can be increased by a short-term RA supplementation of the laying ration. The retinoids present in the natural substances of eggs could possibly be a good source of vitamin A for humans.
给产蛋日本鹌鹑投喂的日粮分别添加醋酸视黄酯（RA）（50×10³国际单位/千克，A组）、抗坏血酸（500毫克/千克，C组），或两种物质相互组合添加（AC组）以及添加醋酸生育酚（37.8国际单位/千克；AE组和ACE组）。在第1、8、14、20和28天，测定了鸡蛋的一些定量参数（蛋壳、蛋白和蛋黄的质量，蛋黄中的类维生素A含量）。产蛋参数未受到添加物的显著影响。到第二周结束时，接受添加饲料的组（AC组、AE组和AEC组）蛋黄中总维生素A（视黄酯+视黄醇）浓度显著高于对照组。两周后（第28天），除抗坏血酸处理组外，所有组的维生素A水平均显著升高。从蛋黄维生素A强化的角度来看，联合添加（AC组、AE组、AEC组）似乎更有效。结果表明，通过在产蛋日粮中短期添加RA可提高蛋黄中的维生素A含量。鸡蛋天然物质中存在的类维生素A可能是人类维生素A的良好来源。
