TY - RPRT TI - Butorphanol tartrate acts to decrease sow activity, which could lead to reduced pig crushing. AU - M F Haussmann AU - D C Lay AU - H S Buchanan AU - J G Hopper PY - 1999 DO - 10.2527/1999.7782054x UR - https://pubmed.ncbi.nlm.nih.gov/10461981/ ID - 10461981 ER -