Facebook post by University of Helsinki

Microalgae could work as sub­sti­tu­tes for soy and faba beans in feed­ing dairy cows. It could also decrease ni­tro­gen ex­cre­tion into the en­vir­on­ment when substituting for soybeans.
Microalgae suitable substitutes for soy and faba beans in feeding dairy cows | University of Helsinki helsinki.fi

As indicated by studies carried out at the University of Helsinki, there are no biological or physiological obstacles to using microalgae as a protein feed for dairy cattle.