Thank all for replying.
The ducks don't look ill or act it, they are very active and keen to forage around the garden. They also have a good appetite and seems especially desparate for food when I first let them out. They always have access to the layers pellets during the day. I have been giving them cooked vegetables mixed with either pasta or potato each day while the snow and frost was here. They don't seem to fussed for the corn, I have tried it cook and straight out of the bag but there's always some left in the bowl. It is the mixed corn intended for chickens I think (Smallholder Range).
I think I will stop putting the water in with them at bedtime as their bed is soaked and I have to change it regularly. It's just they seem desparate for food and water in the morning when I let them out.
They are still laying an egg each evaryday, even through the cold weather so hopefully their weight loss is just down to that.
I was doing some research and came across Impaction (crop binding). Is this common? I'm not sure where the crop is (neck?) as my book says to give the duck a spoonful of cooking oil and then 'knead' the crop area.

They do forage all the time, would it be obvious if they had a blockage?
lastly, is it good to have a food routine, I just give them veggies when I can. Should I try a feed just pellets in the morning and veggies/corn in the afternoon?
