Is this orchard hay?

[Piggies2023]

I've got lots of these in my orchard hay this time. Does anyone know please if this part of orchard hay? I get wary of feeding things I shouldn't.

 

[Grand Guinea Pigs]

Bump

 

[Piggies&buns]

It looks like a piece of a different type of plant caught up in the hay.

 

[Piggies2023]

It looks like a piece of a different type of plant caught up in the hay.

Thank you. There is a lot of it, hopefully not bad for the pigs