5 uppsatser
The heterosis effect and breed group effect of crossbreds between Swedish Holstein (SH) and Swedish Red (SRB) was estimated in this study. Observations on cows born between 1990 and 2012 were used to estimate the heterosis effect and breed group effect for several traits …
… functional and production traits of different dairy breeds and utilize the heterosis effects which emerge when two or more breeds are crossed. Results from different studies with Holstein crossed with Jersey, Brown Swiss, Normande and Scandinavian Red have shown that the crosses …
… of inbreeding among purebred Holstein. The main benefit of crossbreeding is heterosis, which is the improvement in genetic level in a hybrid offspring above the average of the parent breeds. Results from several studies have shown that crossbreeding is the most profitable …
… and early summer and the lowest during autumn. The results showed no effect of heterosis on litter size; instead the purebred litters of Landrace had the highest litter size. This is probably due to selection in the nucleus herds of secondary sows for crossbreeding and superior …
… and early summer and the lowest during autumn. The results showed no effect of heterosis on litter size; instead the purebred litters of Landrace had the highest litter size. This is probably due to selection in the nucleus herds of secondary sows for crossbreeding and superior …
