Just had to share this bit of advice from an old person---my 91yr old FIL.  Pop grew up on a dairy farm in GA...his family grew/produced ALL of what they needed.
He thinks my "silkie hobby" is pretty ridiculous...no Pop, we don't eat the chickens, they have black meat and very little of it......no Pop, we dont' eat the chickens eggs, we hatch them...
I do all of his shopping and picked up 2 watermelons.....1 for him, 1 for the Silkies
Pop~~you can't feed watermelon to chickens
Me~~why not Pop?
Pop~~it'll give em the sorehead
Me~~the sorehead? whats that?  (I have been feeding watermelon to the Silkies for years)
Pop~~you don't know what the sorehead is?  here I thought you knew everything bout chicken raisin'.   You give em a melon....they get it on their head....the other chickens peck their head and give em' the sorehead....
Oh yes~~always follow an old persons advice