I give my chickens Verm-X once a month as a preventative for worms. I am now wondering if this is enough? I have 3 hens at the minute who should be laying (all the rest are too young yet). One is laying normally, one is laying a white egg (when it has been brown for the last year!) and one seems to have a soft shell, as underneath the roost for the last few mornings there has been an egg on the ground, which looks like it has just 'fallen out'!! They all get Layers pellets in the morning first thing, they have mixed corn in the afternoon and have an oyster mix grit ad lib when they want it. Only one had a slightly pasty bum tonight when i checked them, like two feathers stuck together. They are all starting to moult too. They aren't fat chickens and you can feel their breast bone, (except jimBob the roo), they don't always finish their food so its not like they are hungry. The other thing i noticed tonight when i checked was that Jimbob had nothing in his crop, the girls did they were nice and full but nothing in his, is this normal, has he digested it quicker?? He was certainly eating his corn at 4pm this afternoon. Does it sound like they have worms??