I currently have eight ducks and two chinese geese. Of the ducks I have five drakes and three females (two runners and a rouen). Every evening the waterfowl are put to bed in a 12x30 "duck house" which has a concrete floor, covered in lots of fresh shavings, a infrared heat lamp in a corner for the coldest nights, and couple of nesting boxes for them ( litter boxes and there upturned lids filled with clean shavings). Every morning they are turned out onto a large grassy yard with a year round creek. My concern is I only get an egg or two a week from the ducks and I feel like I should be getting more. I feed good feed and I don't see eggs being laid along the creek because I look for them all the time. Any suggestions?