Lamb, G. C., M. F. Smith, G. A. Perry, J. A. Atkins, M. E. Risley, D. C. Busch, and D. J. Patterson. 2010. “Reproductive Endocrinology and Hormonal Control of the Estrous Cycle”. The Bovine Practitioner 44 (1):18-26. https://doi.org/10.21423/bovine-vol44no1p18-26.