“Assessment of some production traits of Butana heifers as affected by age and calving season ” (2017) The Sudan Journal Of Animal Production المجلة السودانية للانتاج الحيواني, 22(22), p. 7. Available at: https://sud-jap.sd/Journal/index.php/sjap/article/view/193 (Accessed: 7 November 2026).