Al-Ani, L. and Al-Rawi, A. 1996. Factors effecting dairy performance in Friesian and Friesian X Iraqi crosses. : Milk yield and lactation period. Al-Mukhtar Journal of Sciences. 3, 1 (Dec. 1996), 63–77. DOI:https://doi.org/10.54172/mjsc.v3i1.493.