Ten lactating cows were used to compare the feeding value of calcium carbonate (CaCO~)-treated em'n silage with normal corn silage.A singlereversal design with 7-wk periods was employed.Cows were fed corn silage as their only roughage, and grain according to 4% fat-corrected milk (FCM) production.The feeding of CaC0.~-treated silage had no significant effect on milk, 4% FCM, or per cent solids-not-fat (SNF) produced by the cows.The milk fat percentage was lower in milk from cows fed CaCO~-treated silage (P < .10).Voluntary dry matter (D.M.) consumption of normal corn silage was significantly greater (P < .01)than that of Ca C0~-treated corn silage.The average body weight gain was greater (P < .10)for cows fed normal corn silage.Corn silage treated with CaCO~ (13.6 lb/ton) had a higher pH (3.92 vs.
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Simkins et al. (1965) studied this question.
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