TY - JOUR ID - 129000033 TI - Frustration on the factory farm. PY - 1991 DB - UniCat KW - Abnormal behaviour. KW - Frustration. KW - Housing. KW - Management. KW - Pig. KW - Stress. KW - Welfare. UR - https://www.unicat.be/uniCat?func=search&query=sysid:129000033 AB - ER -