Milk production is undoubtedly one of t he major branches of livestock production where we have, according to the FAO Production on Year Book (1980), more than 200 million dairy cows producing more than 400 million ton s of milk, and in addition a large fraction of th e  total beef consumed. 

L. Dempfle

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 351–356, 1982
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