I know this article is old but I just saw it today.http://www.dtnprogressivefarmer.com/dtnag/common/link.do;jsessionid=B6894048CCF4EA3DBC7A71E55B03AA64.agfreejvm2?symbolicName=/ag/blogs/template1&blogHandle=livestock&blogEntryId=8a82c0bc49f2d3d3014ba7fc79141001