number of fetuses with external malformations to total number of live fetuses ratio +
number of fetuses with skeletal malformations to total number of fetuses ratio +
number of fetuses with visceral malformations to total number of fetuses ratio +
offspring measurement +
semen measurement +
Any measurement of the viscous secretion of the male reproductive organs, typically containing spermatazoa and secretions of the testes, seminal vesicles, prostate, and bulbourethral glands.