What are the important features of a building which could be used as a milking shed(parlour),dairy(milk room) and food store to ensure production of clean fresh milk?

http://www.google.com/webhp?source=search_app#hl=en&gs_rn=11&gs_ri=psy-ab&suggest=p&pq=we%20shall%20overcome&cp=12&gs_id=1e&xhr=t&q=milking+shed+design&es_nrs=true&pf=p&biw=711&bih=453&sclient=psy-ab&oq=milking+shed&gs_l=&pbx=1&bav=on.2,or.r_qf.&fp=1a317f44bff72960