Periodic fluctuations of daily milk yield in  a period of 20 to 30 days.
D000818:Animals; D001831:Body Temperature; D002417:Cattle; D003201:Computers; D005260:Female; D007774:Lactation; D008433:Mathematics; D008892:Milk / Q000378:metabolism*; D010507:Periodicity; D013696:Temperature; D013997:Time Factors