Читать книгу The Complete Book of Dog Breeding - Dan Rice - Страница 10

Canine reproductive biology is somewhat unique. The bitch is monestrous (having one estrus period each season), showing no seasonality of estrous cycles in most breeds. Unlike some wild carnivores, environmental temperature and climatic changes have little or no effect on domestic canine estrous. They may start their first heat period at any time of the year, whether kept in your home, outside, or in a kennel.

It is generally accepted among breeders and canine reproductive specialists that the preferred time to breed a bitch is two days after ovulation. As you will see, calculating that time in an individual bitch is not quite as easy as making the generalization.