Here are some articles to read about reproductive disorders:
http://www.chickenvet.co.uk/health-and-common-diseases/egg-laying-issues/index.aspx
http://www.poultrydvm.com/condition/egg-peritonitis
http://www.theveterinaryexpert.com/backyard-poultry/egg-yolk-peritonitis/
http://www.chickenvet.co.uk/health-and-common-diseases/egg-laying-issues/index.aspx
http://www.poultrydvm.com/condition/egg-peritonitis
http://www.theveterinaryexpert.com/backyard-poultry/egg-yolk-peritonitis/