I have 5 ducks, feeding them grower feed right now (13 weeks old). They should be ready to lay come spring. They free range on a 1/2 acre right now with grower/oat mix available during the day. My question - Should I start layer feed over the winter or wait til they start laying? I'm almost out of grower & need to buy feed within a week. Trying to figure out what to buy to get thru the winter. Thanx for any help.