There are various reasons for people to breed dogs. The is a Japanese breed of hunting dog. The "husky" dog breed comes from the Siberian Husky. They were dog hybrids in different sizes and phenotypes with no formal breed. The study tested for the degree of admixture with European breed dogs. Hartl compiled a draft standard of a new dog breed. They are also popular to hobbyists who want to breed marine species in captivity. Females typically breed every two or three years. Males usually do not breed until their second year. Females can breed again around a year after parturition. Whether or not these hybrids could breed remains unknown. Wildebeest females breed seasonally and ovulate spontaneously. Females normally first breed as 1-year-olds. The Coton is a playful, affectionate, intelligent breed. "The Bulldog Breed" (1960) was more conventional.