Animal genetic resources for food and agriculture of animal genetic resources includes diversity at species, breed and within-breed level. Known are currently 8,800 different breeds of birds and mammals within 38 species used for food and agriculture. The main animal species used for food and agriculture production are cattle, sheep, goats, chickens and pigs. In the livestock world, these species are often referred to as "the big five". Some less-utilized species include the dromedary, donkey, bactrian camel, buffalo, guinea pig, horse, rabbit, yak, goose, duck, ostrich,partridge, pheasant, pigeon, and turkey. The history of animal genetic resources begins about 12,000 to 14,000 years ago. The domestication of major
Bulldog breeds Bulldog got interbred with the Old English Bulldog from the 1600s. This breed was bred to guard, hunt and herd. It is a social dog breed with excellent skills for guarding much like the American Bulldog, with a similar body type. This breed is also lesser known than the American Bulldog and the Old English Bulldog. In response to the health problems associated with many short-muzzled dog breeds, particularly the Bulldog, a number of breeders offer alternative bulldogs, some of which are true-breeding lineages, and some are first-generation crosses between two established breeds. Some of these breeders aim to recreate