Cat neutering refers to the castration, or the removal of the testicles of a male cat so that he can not impregnate a female cat. (northelmanimalhospital.com)
There have been recorded cases of «neutered» cats impregnating female cats shortly after their operation. (fanciers.com)
She had witnessed male langurs attacking infants sired by rivals and leaving them for dead to clear the way for impregnating females with their own genes. (discovermagazine.com)