Poor sex education amongst cat owners may be leading to more than 200,000 unplanned litters - or 850,000 kittens every year in the UK, according to research published online in the Veterinary Record today.

Authors Dr Philippa Welsh, Professor Tim Gruffydd-Jones, Margaret Roberts and Dr Jane Murray based their findings on a survey of almost 10,500 UK households and more than 3000 completed returns (30% response rate).

Information was gathered on pet ownership, with specific questions asked of owners of female cats about how many planned or accidental litters their pets had had. The survey also aimed to probe the prevalence of common misconceptions about the breeding patterns of cats.

In all, data was collected from 715 cat-owning households, of which 426 owned one or more female cats. Around 1 in 8 (13%) of these owners said that their pets had had one or more accidental litters.

A total of 128 litters had been produced by 91 (out of 552) female cats; 65 of these had given birth to 102 unplanned litters, meaning that just under 80% of all litters had been accidental.

Unplanned litters were more than twice as likely in households owning more than one cat and more than four times as likely if the owner mistakenly believed that a female cat should have a litter before being neutered, the responses showed. Men were more than twice as likely as women to hold this belief.

The authors calculate that if this belief were dispelled, there could be around 213,000 fewer litters and more than 851,000 fewer kittens born in the UK every year.

Half (49%) of 682 cat owners surveyed believed that cats should either have a litter before being neutered (23%) or were unsure if they should (26%), despite there being no evidence whatsoever that this benefits feline health.

Similarly, among the 659 owners who answered the question about puberty, most (83.5%) mistakenly believed that the youngest age at which a cat could get pregnant was five months, with a further one in four (26%) believing that an unneutered female cat (queen) couldn't get pregnant before the age of 12 months. The authors point out that whilst it is not common for a four month old kitten to get pregnant, it does happen.

Furthermore, one in seven cat owners incorrectly thought that unneutered related cats wouldn't mate with each other, and a further one in four (24.5%) were unsure.

The authors said: "The vast majority of litters born to cats in the UK are not planned. This study suggests that improving cat-owner knowledge of the reproductive capacity of cats is likely to have a significant impact on the numbers of accidental litters."

The authors concluded that dispelling the commonly held belief that cats should have a litter before neutering would probably have the single biggest impact on the figures.

Read the full paper

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