Blanchard , T. L., S. P. Brinsko, D. D. Varner, C. C. Love, A. O’Meara, and J. Ramsey. 2010. “Relationships Between Stallion Age, Book Size, Number of Matings (covers), Breeding Soundness Examination Findings, and Fertility Parameters in 15 Thoroughbred Stallions (34 Stallion Years)”. Clinical Theriogenology 2 (2):91-97. https://doi.org/10.58292/CT.v2.11334.