A breed registry, also known as a stud book or register, in animal husbandry

Animal husbandry

Animal husbandry is the agricultural practice of breeding and raising livestock.- History :Animal husbandry has been practiced for thousands of years, since the first domestication of animals....

 and the hobby

Hobby

A hobby is a regular activity or interest that is undertaken for pleasure, typically done during one's leisure time.- Etymology :A hobby horse is a wooden or wickerwork toy made to be ridden just like a real horse...

 of animal fancy

Animal fancy

Animal fancy is a hobby involving the appreciation, promotion, or breeding of pet or domestic animals.Fancy may include ownership, showing, trialling and other competitions, breeding and judging. Hobbyists may simply collect specimens of the animal in appropriate enclosures, such as aquaria and...

, is an official list of animals within a specific breed

Breed

A breed is a group of domestic animals or plants with a homogeneous appearance, behavior, and other characteristics that distinguish it from other animals or plants of the same species. Despite the centrality of the idea of "breeds" to animal husbandry, there is no scientifically accepted...

 whose parents are known. Animals are usually registered by their breeders when they are still young. The terms "stud book" and "register" are also used to refer to lists of male animals "standing at stud", that is, those animals actively breeding, as opposed to every known specimen of that breed.