Abstract
Dairy cows were fed freshly mown herbage or winter rations which together with the drinking water gave Na intakes of betwen 5.8 and 91.0 g./day. The availability of the Na varied from 77 to 95% averaging 85.5%. The Na secretion in the milk averaged 0.38 g./l. varying from 0.31 to 0.49 g./l. The Na requirement for dairy cows with milk yields of 10-30 kg, /day when the Na was 75-95% available ranged from 10.0 to 23.3 g./day. D.E.C. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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