we have several adult ducks who had been laying daily, even through last winter, for a year. they stopped a couple months ago. their food has stayed the same, and they are in the same pen. they stopped laying before the days started to get shorter, plus they laid all last winter, with no lights. we have had some funky weather this year, with it being super hot (even for FL) followed by weeks of heavy rain, and then back to hot again. we also had fowl pox go through our chickens, but they are penned away from the chickens. none of the ducks seemed the least bit ill, just not laying. what could have caused this, and how do i get them to lay again?