?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Butler%2C+G.&rft.aulast=Butler&rft.aufirst=G.&rft.date=2007&rft.title=Effect+of+production+system+and+geographic+location+on+milk+quality+parameters&rft.genre=proceeding