00427nam a22001217a 4500020001800000082002100018100001900039245015800058250000600216260002800222300000800250440004700258  a9780851998138  a636.514 2bPER/W  aPerry, Graham   aWelfare of the laying henb:Papers from the 27th Poultry Science Symposium of the World's Poultry Science Association (UK Branch), Bristol, UK, July 2003  a1  bCAB Internationalc2003  a430  aVol. 27th Poultry Science Symposium Series