After a 3-wk standardization ration of alfalfa hay and corn silage ad libitum and concentrate at 1 kg/3 kg milk, 30 lactating Holstein cows were fed 2.3 kg hay/day and one of five concentrate rations ad libitum for a 6-wk experimental period. Concentrate rations were: (1) control, (2) dried whole whey, (3) high mineral whey product, (4) demineralized whey, and (5) lactose. Ration 3 contained the same amount of minerals from whey as ration 2 while rations 4 and 5 contained the same amounts of lactose as ration 2.
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Schingoethe et al. (1973) studied this question.
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