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Generally, laboratory mice become sexually mature between fi ve and eight weeks of age. Males of most. strains usually mature sexually by six weeks of age. DBA/2J (000671) and C3H/HeJ (000659) mice are precocious: females can. conceive when they are as young as 23 days old.
When progesterone levels are used to gauge ovulation, the feline gestation period usually falls within a more refined timespan of about 63 to 66 days (i.e. more accurate) from the time of the first progesterone level increase. successful mating, also called a fertile mating, is a mating (copulation) between male and female cats that results in the ovulation of eggs (ova) from the female cat's ovaries and their fertilization with male spermatozoa (sperm) within the oviducts of the uterine tract.