Effects of parity order, age at first calving and season of calving on productive performance of Friesian crossbred cattle in Sudan. Journal of Veterinary Medicine and Animal Production, [S. l.], v. 8, n. 2, 2021. Disponível em: https://onlinejournals.uofk.edu/vet/article/view/271. Acesso em: 25 may. 2026.