Compost containing animal blood

Assalamu ‘alaykum warahmatullahi wabarakatuhu Mufti Sahib,
I’m translating and forwarding a question on behalf of a sister:
“I’m starting a small vegetable garden and I was gifted some organic compost; among its ingredients are: “blood meal” and “feathers”. According to some reading I’ve done, the blood should be beef’s abattoir blood drained from animals and dried – most likely non-zabiha as I live in a non-Muslim country.
1) Is such compost halal?