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1 Department of Animal Science, University of Padova, Agripolis 35020 Legnaro, Padova, Italy
Four primiparous Holstein cows were gradually introduced, according to a Latin square design, to four diets obtained from the factorial combination of two forage to concentrate ratios (70:30 and 50:50) and two concentrations of monensin sodium (0 and 300 mg/d per cow). Addition of monensin tended to depress feed intake and milk fat content without affecting milk production and without interactions with forage to concentrate ratios. Ruminal propionate percentage was increased more by the addition of monensin to the low forage diet than by the addition of monensin to the high forage diet. Serum urea and concentrations of nonesterified fatty acids tended to decrease when monensin was added to the high forage diet but did not change when monensin was added to the low forage diet. The results suggested that monensin had moderate positive effects on efficiency of milk production and might have an antiketogenic effect with high forage diets.
Key Words: monensin • forage to concentrate ratio • dairy cows
Submitted on November 6, 1995
Accepted on September 13, 1996
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