卵黄生成素(vitellogenin)(Vg),同是基因和此基因所表达的蛋白质的名称。这种蛋白质被分类为“糖脂蛋白”（glyco-lipo-protein），就是说它同时具有糖和脂肪的属性。在雌性鱼类和昆虫中，卵黄生成素是一个蛋黄蛋白质前驱物。

Vitellogenin (VTG or less popularly known as VG) (from latin vitellus, yolk, and gener, to produce) is a precursor protein of egg yolk normally in the blood or hemolymph only of females that is used as a biomarker in vertebrates of exposure to environmental estrogens which stimulate elevated levels in males as well as females. "Vitellogenin" is a synonymous term for the gene and the expressed protein (citation needed). The protein product is classified as a glycolipoprotein, having properties of a sugar, fat and protein. It belongs to a family of several lipid transport proteins.