Eichelberg-Schumann Helga, Franzen Eva
Zoologisches Institut der Universität Bonn, Deutschland.
Wilhelm Roux Arch Entwickl Mech Org. 1971 Dec;167(4):360-366. doi: 10.1007/BF00580170.
The first melanoblasts are found in the embryos of the black Rheinländer and Plymouth Rock chickens at the fifth day of development in the occipital and lumbal region. The further spread of the pigment cells is equal in both races. But at the eight day the pigmented area is much more extended in the Plymouth Rocks. These embryos possess at this time more than twice the amount of melanoblasts which are more pigmented than in Rheinländer embryos of the same age. During the further development this differences are equalized.In both races the colour pattern of the chickens are different and have no similarities with the pattern of adult animals. The different patterns of chickens may be explained by time-dependent, genetic differences during the differentiation of the melanoblasts. The colouration in the adult fowls must be due to different genetic factors, which become effective during the development of the juvenile feathers.
在发育的第五天，首次在黑色莱茵兰鸡和普利茅斯岩鸡的胚胎中，于枕部和腰部区域发现了黑素母细胞。色素细胞在两个品种中的进一步扩散情况相同。但在第八天，普利茅斯岩鸡的色素沉着区域扩展得更多。此时，这些胚胎拥有的黑素母细胞数量是同龄莱茵兰鸡胚胎的两倍多，且色素沉着程度更高。在进一步发育过程中，这种差异逐渐趋于平衡。在两个品种中，鸡的毛色图案都不同，且与成年动物的图案没有相似之处。鸡的不同图案可能是由于黑素母细胞分化过程中与时间相关的遗传差异所致。成年家禽的毛色必定归因于不同的遗传因素，这些因素在雏羽发育过程中发挥作用。
