This chapter contains sections titled: Introduction Proteomics of Plasma and Serum of Animals Proteomics of the Liver of Animals Proteomics of the Immune System of Animals Proteomics of the CNS in Animals Proteomics of Muscle in Animals Proteomics of Milk and the Mammary Gland of Animals Proteomics of the Intestine in Animals Proteomics of Skin in Animals Proteomics of the Respiratory Organs in Animals Proteomics of the Visual Apparatus in Animals Proteomics of Bone and Cartilage in Animals Proteomics of Endocrinology in Animals Proteomics of Kidney and Urine in Animals Conclusions References