This study was conducted to investigate the relation between Tf and Hb-type with some production and adaptive traits in Iraqi local Sharabi and imported Friesian cattle. Tf genes, A, D, and E are found in both breeds at a frequency of 0.464, 0.500 and 0.036 in Friesians and 0.363, 0.426 and 0.191 for the Sharabi.
All Friesians were fixed for gene Hb-A while the A and B genes were segregating at frequencies of 0.64 and 0.46 in the Sharabi.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 324–326, 1990
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