Faculty of Science & Technology, Meijo University, Nagoya, Japan.
Biotechnology R&D Group, ENEOS Corporation, Yokohama, Japan.
Anim Sci J. 2021 Jan-Dec;92(1):e13512. doi: 10.1111/asj.13512.
The effects of feeding diets containing astaxanthin with different Z-isomer ratios to laying hens on egg qualities, such as astaxanthin concentration in egg yolk and yolk color, were investigated. As the astaxanthin source, a natural microorganism Paracoccus carotinifaciens was used. Astaxanthin with different Z-isomer ratios was prepared by thermal treatment with different conditions and then added to the basal diet at a final astaxanthin concentration of 8 mg/kg. We found that, as the Z-isomer ratios of astaxanthin in the diet increased, the astaxanthin concentration in egg yolk and the yolk color fan score also increased significantly. Importantly, feeding a 50.6% Z-isomer ratio diet increased astaxanthin concentration in egg yolk by approximately fivefold and the color fan score by approximately 2 compared to that in hens fed an all-E-isomer-rich diet. Moreover, we showed that feeding Z-isomer-rich astaxanthin to laying hens increased plasma astaxanthin concentration by more than five times in comparison to that in hens fed an all-E-isomer-rich diet. These results indicate that Z-isomers of astaxanthin have higher bioavailability than that of the all-E-isomer and thus they exhibit greater egg yolk-accumulation efficiency.
研究了向产蛋母鸡投喂含有不同 Z 型异构体比例虾青素的饲料对鸡蛋品质（如蛋黄中虾青素浓度和蛋黄颜色）的影响。作为虾青素的来源，使用了一种天然微生物 Paracoccus carotinifaciens。通过不同条件的热处理制备了具有不同 Z 型异构体比例的虾青素，然后将其以最终虾青素浓度 8mg/kg 添加到基础日粮中。我们发现，随着饲料中虾青素 Z 型异构体比例的增加，蛋黄中虾青素的浓度和蛋黄颜色扇形评分也显著增加。重要的是，与投喂富含全 E 型异构体的日粮相比，投喂 50.6% Z 型异构体比例的日粮可使蛋黄中虾青素浓度增加约五倍，颜色扇形评分增加约 2。此外，我们表明，与投喂富含全 E 型异构体的日粮相比，向产蛋母鸡投喂富含 Z 型异构体的虾青素可使血浆虾青素浓度增加五倍以上。这些结果表明，Z 型异构体虾青素的生物利用度高于全 E 型异构体，因此表现出更高的蛋黄积累效率。
