Have you seen the Ultimate list of treats for ducks? It's in the Stickies section (blue link at top of duck index). I am not sure about pineapple - but many ducks eat fruit - I just am not sure…. Yes, I get a little overprotective. Please bear with me, you are definitely a caring duck keeper.
Not joking.
This time of year I sprout wheat seeds for them. Sometimes I feed them as sprouts, sometimes I let them green up a little - the ducks seem to appreciate leafy green things this time of year. Lettuce cores are appreciated also (but make sure you don't have any doofus ducks that...
Rowena, my little black duck (Cayuga? BEI? There is some debate, as she is adopted) is laying a few each week. Mostly on days that are above freezing. Her laying is definitely affected by temperature.
I also know that there seems to be more egg laying in general when there is regularly...
Ducks can have quite a bit of variation in when they lay eggs. Mine used to lay between 2 a.m. and 7 a.m., then sometimes in the afternoon, and now rarely before 8 a.m.
Yup, 5F. Too cold for Runners to be out. MIne have only wanted to go out a couple of times a day, and only for about ten minutes while I do a quick room service. It's in the upper teens F. here.
My Runners lay large chicken egg sized eggs. If I recall, my Pekins' eggs were noticeably larger than that. also I have been told Runners - a smaller breed - will start laying a little earlier than Pekins, generally speaking.