I have been consistently getting 4 eggs from my 5 Muscovys. The last couple of days, I only have 2. I have also had, 2 days in a row, one of the girls laying an egg with no shell just the membrane and complete yolk and white. Not so much laid them, as I watched her walking along and one just fell out. No change to food. I did get 5 more females who were kept separate for a week. All ducks together now and there doesn't appear to be any squabbling. Suggestions please.