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Data on 2422 and 27756 Friesian cows in Egypt and Germany, respectively, were used to estimate genetic andnon-genetic effects on initial milk yield in 70 days (IMY), 305-day milk yield (305-dMY), lactation period (LP)and calving interval (CI). Data were collected in the period from 1987 to 1992 in Egypt and from 1979 to 1993in Germany. Least Squares analysis shows the significant effect of season and year of calving and parity on alltraits. Least Squares analysis indicates that winter and spring calvers had the higher value in all traits studied thansummer and autumn calvers of Friesian cows in Egypt, while in German Friesian cows, the autumn calvers hadthe higher value in all traits studied than summer and spring calvers. The results show that the milk yieldincreased with increased lactation Orders. Partial linear and quadratic regression coefficients indicate that age atcalving was negatively associated with CI, while it showed positive association with LP and 305-dMY inFriesian cows in Egypt, while in German Friesian cows age at calving was negatively associated with LP and CI,while associated positively with milk yield. Heritabilities were 0.24, 0.22, 0.14 and 0.16 for IMY, 305-dMY, LPand CI, respectively of Friesian cows in Egypt and were 0.34, 0.24, 0.08 and 0.09 for IMY, 305-dMY, LP andCI, respectively in German Friesian cows. All phenotypic and genetic correlations between different traitsstudied were positive and significant

Study on Friesian Herds Raised in Egypt and Germany – I. Estimate of non-genetic effects and genetic parameters