Wikipedian artikkeli jättää hiukan kysymysmerkkejä kissojen kuukautisten suhteen.
Female cats are seasonally polyestrous, which means they may have many periods of heat over the course of a year, the season beginning in spring and ending in late autumn. Heat periods occur about every two weeks and last about 4 to 7 days. Multiple males will be attracted to a female in heat. The males will fight over her, and the victor wins the right to mate. At first, the female will reject the male, but eventually the female will allow the male to mate. The female will utter a loud yowl as the male pulls out of her. This is because a male cat's penis has a band of about 120-150 backwards-pointing spines, which are about one millimeter long; upon withdrawal of the penis, the spines rake the walls of the female's vagina, which is a trigger for ovulation. This act also occurs to clear the vagina from other sperm in the context of a 2nd (or more) mating, thus giving the latter males a larger chance of conception.
After mating, the female will wash her vulva thoroughly. If a male attempts to breed with her at this point, the female will attack him. After about 20 to 30 minutes, once the female is finished grooming, the cycle will repeat.
Käsitinkö oikein, että naaraskissa ei valuta verta vaginasta, jos se ei ole kertaakaan paritellut yhdenkään uroksen kanssa? Vai onko ensimmäinen parittelu ainoastaan munasolun irtoamisen laukaiseva tekijä?
Voiko naaraskissa valuttaa jotain verta ohuempaa tavaraa, vaikka se ei olisi paritellut kertaakaan tai voiko 'menkkaveri' olla normaalia verta ohuempaa tavaraa?