It has been my experience that pasty butt is caused by the stress of shipment. When the chicks have been with out food or water for 2 or 3 days in transit they tend to gorge themselves with food and water this causes diarrhea which sticks to their down. I pick mine up directly from the hatchery right after they are hatched and do not have a problem with this condition. The hatchery they are ordered from my have something to do with this also. As for splayed leg I cull the affected chick, seems hard hearted but with so many chickens I can't spend time nursing every chick with a problem. Of course every thing we use here from feeders to waters is jumbo sized compared to what most people use, and feed is purchesed in bulk to save money.