American Finnsheep Breeders Association
North American Shetland Sheep Breeders Association
Mule Sheep Society Information on the Three Tier Breeding of Hill Breed ewes – known in the UK as the “Stratified 3-Tier Breeding System”
Shetland Sheep Information This is a fabulous site FULL of information on Shetland sheep, genetics, colors, patterns, etc.
Minnesota Lamb and Wool Producers
Breeds of Livestock Project, Oklahoma State University
Making New Bloodlines Using the Only Ram You Have – article in Sheep Magazine by Carol Elkins
Inbreeding: It’s Meaning Uses and Effects on Farm Animals by Dale Vogt, Helen A. Swartz and John Massey, Department of Animal Sciences, University of Missouri Extension
