I don't have that option, and nobody in Israel feeds their pigs in the hay.
I at least give them hay to eat.
What I'll do is like this:
I'll take a newspaper and vamp the cage with him.
On the paper, I lay hay.
Once a week I will replace the entire substrate, and I will add some hay to the food every day.
The price of 45 kilos of hay is a quarter of a salary.