This is the time of year when every unspayed, queen (female cat) is likely to have a belly full of babies or a litter by her side. Kitten season occurs because the queen has evolved into a seasonally polyestrous creature. This means she comes into heat only during a particular time of year, during which she is capable of having multiple pregnancies, writes Nancy Kay, DVM.
Peak <breeding> seasons are February through March and May through June. Throughout the rest of the year, the reproductive cycle goes into a state of dormancy referred to as “anestrus.”
Source: Pet Health Network. Link. The domestic cat has long been recognized for her fertility and may have two or more litters during kitten season.
Allowed to breed naturally, a queen might easily produce in the range of 50 to 150 kittens over the course of ten years.
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