Abstract
We investigated effect of sire on meat production in crossbred between Japanese Black bulls and Holstein cows. First, crossbred steer are different in sire (Itozakura and Tajima) were used for the evaluation of growth performance and carcass characteristics on same feed intake system. Second, we investigated effect of period in the middle of fattening. Experimental results are summarized as follows: The Itozakura strain crossbred carcass weight are bigger than the Tajima strain crossbred's. And so, crossbred meat production are greatly influenced by sire of Japanese Black bulls. Moreover, a two-months extension to period in the middle of fattening in the Tajima strain crossbred brings about just control serum vitamin A. And so, just control serum vitamin A improves beef marbling. This study shows that crossbred meat production are greatly influenced by sire of Japanese Black bulls and crossbred needs suitable feed intake system for each strain.
