Breed and weight would determine how high they can "jump". I would recommend either a ramp for them to walk up or different height bars so they can hop from one to the other. One thing I do suggest is having the first roost only 12-18 inches off the floor as the larger breeds can develop bumble foot from jumping down from higher roosts. I learned this the hard way, for both me and the poor hens I had to do surgery on. Also if you use 2 x 4's for roosts put them on the flat so they can tuck their feet under them during cold weather. Cheers, SheilaHow high can they jump straight up? Or should I put in different height bars so they can jump from one to the next?
Every time I have ever checked on them at night they are all sleeping close together lined up on the low roosting bar. They've never pooped in the roosting boxes so far.