B. A, E.-. N. .; A.M, M.; O. A, E. khidir; M., A. 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 apr. 2025.