B. A, El- Nazeir; A.M, Mohammed; O. A, El khidir; M., Atta. 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: http://onlinejournals.uofk.edu/index.php/vet/article/view/271. Acesso em: 4 oct. 2025.