Oklahoma State University
Oklahoma State Univ: Breeds of Livestock Other Species
This is a good overview of the use of "other species" that one would not immediately think of as a domesticated mammal. Examples include Buffalo and Llamas.
Oklahoma State University
Oklahoma State University: Breeds of Livestock Sheep
A good account of the history of the use of domesticated sheep. Links to examples of specific breeds and their uses.
Oklahoma State University
Oklahoma State University: Breeds of Livestock Swine
This site provides a good history of the use of pigs and their origins. It has links to specific examples of pigs and what they are used for.