сущ.
женская сперма (содержащая X-хромосому)
Female sperm is a term that refers to a sperm that contains an X chromosome, produced in the usual way by a male, referring to the fact that, when such a sperm fertilizes an egg, a female child is born.
If you are questioning the gestational age of a litter (i.e. Female's Sperm Positive Date), provide the average and range of the crown-to-rump length for the litter.
Often the sex of the baby in May up to the subtle interplay of number of factors that make female sperm "positive" on the particular occasion.
Англо-русский универсальный дополнительный практический переводческий словарь И. Мостицкого. И. Мостицкий. 2002-2012.