I got a very good deal on three new gilts. The big black gilt (not pictured) is overweight and these two in front are very thin and half her size. They're all the same age, born late 2013. The scrawny ones are from the same litter. Do you think they're so thin because the large one was bullying them away from feed or is this a case of genetics? I was really hoping to butcher two and keep the red one to breed, but maybe that's a bad idea? Will they gain weight if given ample room and feed or will they be a money pit? I live in North Dakota and winter is on our heels. I wormed them as soon as the previous owner left.