Whitey and Growing Ducks

I’m a little concerned about Whitey, the White Appleyard.  He (she?) seems a little more lethargic than the others, and sits a lot, even while eating and drinking.  He’s got an odd reddish spot alongside his neck that particularly shows up when he’s wet, he just seems a bit odd.  I wonder if he’s growing too fast, and if we’ve given the ducks too much protein.  According to the book, we should be dropping the protein content about now anyway, so I’ll mix some lower protein in ...