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Prairie Swine Centre is an affiliate of the University of Saskatchewan
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Publication Date: October 4, 2011
Reference: livestockwelfare.com Jan 2012 Research Watch
Country: Canada
Summary:
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Researchers believe that because chickens have been raised in cages for so long, and from an elite bloodline that does not factor in behavioral traits, that there has been a failure in mating habits and increased aggression in the flocks. Looking at different blood lines and time periods researchers found some differences in aggression and mating habits.