I have 3 pigs and 2 of them are plagued with ongoing gut problems, mainly bloating up with gas and being unable to poop properly. These episodes usually happen after vegetables but both of them were perfectly healthy until around January/February of this year, my boys will be 2 in September. My other pig Rodney is fine with his veg so I was wondering whether Bradley and Barney's problems could be genetic or is it just a coincidence? Also I have a question regarding vitamins. Due to me being unable to give Bradley and Barney vegetables often due to their bloating, do I need to give them a vitamin C supplement or will they get what they need from their pellets? I've asked this question before and no one replied, I am grateful for any advice! 
Thanks.
Thanks.