Second and third lactation records of cows from the FAO trial in Poland were used to compare dairy performance of different Friesian strains. Data included only cows that were culled after second and third lactation. In total, 2 513 second lactation r e cords and 1 949 third lactation records were available for analysis.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume IX. Breeding programs for dairy and beef cattle, water buffalo, sheep, and goats., , 112–114, 1986
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