US Department of Agriculture
Usda: National Agricultural Statistics Service
A good site for statistical evidence of the importance of domesticated mammals in feeding this country. Click on any of the animal types and you can retrieve how many were slaughtered.
Oklahoma State University
Oklahoma State University: Breeds of Livestock Cattle
A comprehensive list of most of the breeds of domesticated livestock that are used in the cattle industry. Brief history of their use and links to background and use of each breed.
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 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.
PBS
Pbs Nature: Pigs
This resource offers a clear and concise description of domesticated pigs. Students who need help narrowing their informational search will benefit from this type of condensed resource.
Other
Canadian Federation of Humane Societies: Marine Mammals in Captivity
An article expressing concern about the use of marine mammals in the entertainment industry.