A corresponding portion of the egg of other animals, consisting of protein and fat which serve as the primary source of nourishment for the early embryo and protoplasmic substances from which the embryo develops.

• 卵黄其它动物蛋内的相应部分，由蛋白质和脂肪组成，用作早期胚胎的主要营养来源和胚胎由此发育的原生物质