Data of German Black Pied Dairy Cattle (SMR) were used to estimate individual crossbreeding effects. The number of purebred (3) and crossbred (68) genetic groups made it possible to estimate epistatic effects, using models according to Dickerson (1973), Grofihans (1993) and Wolf et al. (1995). The estimates of additive effects are almost similar for all models. Holstein- Friesians showed positive additive effects for milk yield (MY) (+995 to +1,060 kg) and calving interval (Cl) (+9.2 to +10.7 days), but negative effects for fat content (FC) (-0.14 to -0.11%); for Jerseys the additive effects were negative for MY (-842 to -644 kg) and Cl (-15.6 to -6.3 days), but positive for FC (+1.28 to +1.45%). While dominant effects increase the MY (+152 to +272 kg) in all two-breed-combinations, epistatic effects flow in both directions (-358 to +872 kg). The FC is influenced by dominant as well as epistatic effects. For the Cl dominant effects did not reach the significance level, whereas epistatic effects of the Black Pied Cattle x Jersey combination reduce the calving interval (-18.8 to -4.5 days).

M. Stenske, O. Distl, T. Grosshans, G. Seeland

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 23: Opening: plenary; technology; transfer; beef cattle; dairy cattle; pigs., , 395–398, 1998
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