. 2015 Mar 31;94(4):673–680. doi: 10.3382/ps/pev022
© The Author 2015. Published by Oxford University Press on behalf of Poultry Science Association.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com.