The Welfare of Pigs Animal Welfare VOLUME 7 Series Editor Clive Phillips, Professor of Animal Welfare, Centre for Animal Welfare and Ethics, School of Veterinary Science, University of Queensland, Australia Titles published in this series: Volume 1: The Welfare of Horses Natalie Waran ISBN 1-4020-0766-3 Volume 2: The Welfare of Laboratory Animals Eila Kaliste ISBN 1-4020-2270-0 Volume 3: The Welfare of Cats Irene Rochlitz ISBN 978-1-4020-3226-4 Volume 4: The Welfare of Dogs Kevin Stafford ISBN 978-1-4020-4361-1 Volume 5: The Welfare of Cattle Jeffrey Rushen, Anne Marie de Passille´, Marina A.G. von Keyserlingk and Daniel M. Weary ISBN 978-1-4020-6557-6 Volume 6: The Welfare of Sheep Cathy M. Dwyer ISBN 978-1-4020-8552-9 Jeremy N. Marchant-Forde Editor The Welfare of Pigs 13 Editor Jeremy N. Marchant-Forde United States Department of Agriculture Agricultural Research Service 125 S. Russell Street West Lafayette IN 47907 USA
[email protected] ISBN: 978-1-4020-8908-4 e-ISBN: 978-1-4020-8909-1 DOI 10.1007/978-1-4020-8909-1 Library of Congress Control Number: 2008933377 # Springer ScienceþBusiness Media B.V. 2009 No part of this work may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording or otherwise, without written permission from the Publisher, with the exception of any material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work.