If it were me (disclaimer, because I haven't eaten near the sawdust that most of these guys have), I would just stagger any end grain joints and glue it up. I like to use biscuits, but feel they are mainly for alignment purposes, not necessarily for strength.Thanks for that tip. Need to end glue a 3/4" x 4" x 8" oak board to make a 70" board 78" for a side panel. Plan to place this extended board in the middle of the panel so it has support on both sides.
Because it will be an end joint would it be necessary to rabbet the ends of both boards in this situation and glue them together? Thinking a biscuit in the joint may be all that is needed.