Abstract 1. 1. Blood samples from forty-six fetal and 100 adult and juvenile deer, Odocoileus virginianus, were analyzed for twenty-five substances including hematology, chemistries, hormones and individual proteins with significant differences found between ages and sexes. 2. 2. Hemoglobin polymorphism was found in the adult and juvenile animals, but with a significant different frequency than reported for southern populations. 3. 3. None of the protein changes characterizing human pregnancy were observed in the pregnant deer. 4. 4. The fetal samples exhibited a protein polymorphism in the post-albumin area, a hemoglobin polymorphism, but only a single transferrin.