The Merck Veterinary Manual
Open access.
Dukes' Physiology of Domestic Animals. 13th ed., 2015.
Introduction to Animal and Veterinary Anatomy and Physiology. 4th ed., 2020.
Breeds of Livestock Oklahoma State University, Department of Animal Science
Mason's world dictionary of livestock breeds, types, and varieties. 5th edition.
Reference SF 105 .M34 2002
International encyclopedia of horse breeds
Reference SF 291 .H37 1995
Pigs: a handbook to the breeds of the world
Reference SF 395 .P59 1993
Encyclopedia of dairy sciences. 3rd ed., 2021