Heavy rain has had some people's peahens stop laying. Parasites, disease, not enough of a certain nutrition can also cause it. There are many things that can make them stop laying. My hen would stop laying for four days and then start laying again. If they have a clutch or a chick they will stop laying. Sometimes they will stop at this time of year. Some people have no more hens laying right now and some people have very few hens still laying. I never had the chance to test how long my peahen would lay. I let her have her own clutch after I collected as many eggs my incubator could hold. This year I only got 13. Last year 5, year before 5. There are many things that can have them stop laying. I know two years ago when Idaho had a heavy winter that didn't let up until April my hen didn't lay until June and only for 10 days. My hen this year started laying May 2 and stopped laying June 6 since that's when she had achieved a clutch of eggs.
We treat all our birds for parasites on a somewhat regular basis. Honestly, I'm a little paranoid about lice/mites etc because of this mite infestation the farm had when I started working here. Most of the birds were infested. It was disgusting. I treated everything, cleaned all the coops, so forth and so on. I've kept an eye on everything ever since. We even lost our old peacock to the mites because none of the birds were ever treated. Quite sad if you ask me.There are a few ways of getting rid of parasites. Peafowl though tend to be clean birds so expect rather a little to no population of external parasites. With peafowl parasites will stay near the face since peafowl can reach everywhere but their face. Easiest way is have an area for dust bathes, sulfur, citric acid, or some parasitic chemical control. My favorites other than dust bathes since they do that themselves is sulfur and citric acid. Sulfur will fry the parasite then and there and citric acid can kill them fast too. The eggs though are immune to citric acid so you have to use citric acid over the course of a few days. Sulfur and citric acid are hard for parasites to develop an immunity to. Garlic contains sulfur, that's what I use for internal and external parasites. Sulfur works on both, Citric acid is more for the outside of the body. Lemon juice, Orange juice, Lime juice have citric acid. I found the easiest way with citric acid is put a high concentration in their water. When they dip their beaks in it gets on it and when they preen it will spread the citric acid killing parasites. You can try to throw garlic powder straight on to the bird near the tail feathers since they put their faces their a lot. Or set out a bowl with garlic powder as well. Both methods work for my flock and other Idaho Bird Breeders agree with me and use the same methods.
They all have plenty of areas to dust bathe. Maybe I'll take a closer look and see if I can see any bugs on the peafowl. I haven't looked at them that closely in a couple of months. I could try the citric acid juices in their water also. Just out of curiosity, would this work for chickens also?