Don't give up!
My piggies would like to point out that they all love grass and consider it an essential food so please give it to your little piggies and allow them to enjoy the finer things in life! And they are jogging my elbow to write that your piggies should have as much as they want - but I would add that a handful every other day would be brilliant and they would thoroughly enjoy it.
Oh yes - and my piggies heartily approve of buying lots of different veg and have put in a serious complaint to me now that I don't spend enough on veg for them. (I did get some more this morning, in my defence)
Love to your piggies from Carmina, Carmeline, Columbine and Carmilla. xx