Breeds used commercially are often selected for high productivity and an intensively farmed environment. These breeds may often be housed permanently. Many will only be housed in winter. They have many traits that make them less hardy than many traditional breeds and breeding stock may have a short life expectancy. They often require a great deal of human care during lambing, calving when shearing and with hoof care. Some breeds are used exclusively for exhibiting and many have characteristics that make them vulnerable when kept extensively/free range.

Chickens
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Breed
Class
Uses
Ducks
Pigs