Breast Tumors in chickens

John Patrick McAuley (unc-cs!news-relay.ncren.net!newsgate.duke.edu!news.eng.convex.com!cs.utexas.edu!John Patrick McAuley)
Mon, 21 Apr 1997 23:38:09 GMT

I am raising cornish rock cross chickens on pasture in portable pens.
I am getting a lot of chickens that have breast tumors. What causes
this and how to I correct it without antibiotics?