My sister didn't finish her corn on the cob at dinner and asked to give it to the chickens. I told her it was ok. But later she mentioned there was butter and salt all over it, but by the time I went to get it back from the chickens...it was pretty much all gone. So.. is it bad if they consume the butter an salt? I'm just really concerned because I was reading the chicken treat list and when it said popcorn it said no butter no salt.