Ador, Lino Libo, and Abdel Moneim Mukhtar Abu Nikhaila. 2023. “Optimum Time of Insemination After Onset of Oestrus in Holstein – Friesian Dairy Cows in the Peri-Urban Khartoum (Sudan)”. Journal of Agricultural Studies 11 (3):38-52. https://doi.org/10.5296/jas.v11i3.21317.