I have recently lost two of my girls in December/February because they seem to have laid large eggs which damaged their vents. The first one never seemed to have any problems with it; we found some blood in their house one day, but she looked fine so looking back she must have sorted herself out temporarily, because the vet said the damage can sometimes get worse once it's happened once. She prolapsed and got an infection, presumably because her droppings clung to the area around her vent, and my family decided to have her put to sleep because the only antibiotics available would mean we could not eat her eggs for about 6 months, meaning she would have to be separated from the others for a very long time. The other hen must have laid a large egg too because we found a blood-streaked egg that morning, but she looked fine, and then when I got home at around 3:30pm they must have pecked at her already damaged vent, as nobody was home to prevent it. We took her to the vets immediately, because we didn't want to let it get infected and lose another, and we were given Baytril in a liquid form, which we were to put in a plastic syringe and slowly let her drink it from the side of her beak. She was incredibly reluctant to taking the antibiotics, and we couldn't get any of the methods offered online to get her beak to open; we were also very worried that we would hurt her because she was in a lot of pain and we haven't had them for very long, so we are quite cautious with them. We put some Baytril in her water, and she drank it all. We also gave her many warm baths and did our best to clean the area around her vent as instructed. This morning, we found her in her cage and she has very sadly passed away. We thought she was recovering because yesterday, she had laid an egg and tried to jump out of the bath after she'd had enough, but we must have been wrong. We kept radiators by both of them constantly but the second hen did seem to have a little bit of frostbite on her comb, so I rubbed some vaseline onto it. She was drinking plenty, but she didn't really want to eat anything. The reason I'm posting this is because I'm wondering if there is anything we're missing that could be causing their vents to be damaged. Should we put some form of heater by the nesting box? It doesn't seem very practical as their house is in our back garden. They don't seem to mind it in there. We have 6 hens now and I don't want to lose three to the same problem. They were both hybrid hens (Black rock and Sussex star). Thanks.