Mastitis problem herds.
D000818:Animals; D002417:Cattle; D003612:Dairying / Q000295:instrumentation / Q000379:methods; D005260:Female; D008414:Mastitis, Bovine / Q000175:diagnosis / Q000517:prevention & control*; D008892:Milk / Q000166:cytology / Q000382:microbiology; D012499:Sanitation