What should I do with about 30 pints of frozen breast milk?

This is in General.
Over a year ago my daughter-in-law was very aggressive about pumping. She was meticulous about sanitation, freezing after pumping, labeling, etc. Well, she pumped and stored a pile of milk here.
It was never used and has been sitting in my freezer for over a year and should be discarded. But it seems like a waste – and you know how much I hate waste.
Could/should I give it to animals? Should it go in the garden?
I can’t/won’t consume it because…
Any ideas?

(Coincidentally I am listening to NPR and Christopher Kimball’s Milk Street just signed off. )