Shortly before his death, Joseph Smith instructed certain church members to perform animal sacrifices. In fact, there were discussions about including rooms for sacrifices in the planned temple after moving west to Salt Lake City. Later, Joseph Fielding Smith affirmed that animal sacrifice would be reinstated in the future …

“Now in the nature of things, the law of sacrifice will have to be restored, or all things which were decreed by the Lord would not be restored. It will be necessary, therefore, for the sons of Levi, who offered the blood sacrifices anciently in Israel, to offer such a sacrifice again to round out and complete this ordinance in this dispensation. Sacrifice by the shedding of blood was instituted in the days of Adam and of necessity will have to be restored. The sacrifice of animals will be done to complete the restoration (Moses 5:5-8).”

Joseph Fielding Smith, Doctrines of Salvation – Volume 3 (Salt Lake City, UT: Bookcraft, 1956; this quote from 1999 edition), 94.