Bratton, R.W., et al. "Breeding behavior, spermatogenesis, and semen production of mature dairy bulls fed rations low in carotene." Reprinted from Journal of Diary Science, September 1948.

Bratton, R.W., et al. "Breeding behavior, spermatogenesis, and semen production of mature dairy bulls fed rations low in carotene." Reprinted from Journal of Diary Science, September 1948., Box: 1. Veterinary Reprint and Pamphlet Collection, 24-4-3369. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/262368 Accessed December 24, 2025.