so, around a day ago i noticed my pigs werent eating much hay. not the hay they already have in the cage or hay i give them when they wheek for food. They both will eat fruits, veggies, pellets and specifically the oxbow vitamin c treats. But not hay, theyll chew at it and sniff but they just dont eat it. They're drinking water just fine and havent shown any signs of anything bad to my knowledge and today my mom picked up two different bags of hay. They show no interest in eating either. What could this mean?