Estrous cycles
15 day intervals during the breeding season.
Duration of estrus ...
The full estrous cycle (of which the heat is one phase) may last as little as 4 days or as long as 30 days, with the average being 6 days. Cycling may begin in females as young as 4 months of age or may start as late as 1 1/2 years of age.
Queens are seasonally polyestrous, which means they come into heat in certain seasons of the year, and they will cycle multiple times if they are not bred. They are also reflex ovulators, which means they need to be bred before they will ovulate.
Normal fertility in a cat, and the ability to reproduce kittens, requires a normal estrous cycle, with a healthy reproductive tract, normal ova (eggs), normal and stable levels of reproductive hormones, fertilization by normal spermatozoa, ...
[30] Research in Texas has suggested that establishing a home range is necessary for breeding; studied animals with no set range had no identified offspring.[21] The female has an estrous cycle of 44 days, with the estrus lasting five to ten days.
 See also: Behavior, Estrus, Heat, Veterinarian, Shelter
  
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