Date of this Version
Second and third lactation records of F1 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 2513 second lactation records and 1949 third lactation records were available for analysis.
Least squares analysis of variance was carried out sparately for each lactation. The ranking of strains based an second and third lactiation records was similar as in the first lactation. The North American Holstein, Israeli and New Zealand Friesians were superior in milk and fat production. Due to adverse environmental factors the average yield in the second and third lactation was lower than the first.
These preliminary results present ranking based on the group of culled cows and may change when all data are available.