A patient, a seven year old purebred Angus cow, was presented at Stange Memorial Clinic on Jan. 8, 1941. She had begun labor the previous night after having completed a gestation period of supposedly normal length.
Kyner, R. E.
Iowa State University Veterinarian: Vol. 3
, Article 12.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol3/iss3/12