have they been castrated?, as castrated hob's (hoblets) can be left all year round with the jills, I have one hoblet with six jills in the court, another court has three hoblets, and one jill, all get on fine,
but my vasectamised (snipped) hob, still needs to be kept seperate, as do all the intact hobs (all in individual cages)
I keep my hobs seperate as they wont get on before they hace chewed chuncks from one another lol
FM