I brooded quite a few large hatches last year with MPH, then later mixed ages. Don't remember exact #s, but at least 25, but went up to well over 40, yet different ages. But used 2 heating pads
One group (in July?) was like 75, but only had those for a few weeks but when small they fit under 1 big one & a few snuggled under the 2nd small heating pad.
One group (in July?) was like 75, but only had those for a few weeks but when small they fit under 1 big one & a few snuggled under the 2nd small heating pad.