Length of body. So gilts are females. They've been castrated. They must have caught it here. Could be weather conditions or being under the stress of all the people.
Pigs are one of the smartest animals.
They know when to stop eating. Cows and goats just eat until they get bloated. When pigs are full, they stop. I stay in the dorm. Which sucks - the beds aren't that comfortable, and the food isn't that good.