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1 Department of Animal Sciences, University of Illinois, Urbana 61801
A sequential elimination trial was conducted to test the effects of primary tastes on the preference ranking of TMR diets by six multiparous Holstein cows from 8 to 21 DIM. Four additives and a control were examined; the most preferred (highest total intake) was eliminated after segments of 5, 4, 3. and then 2 d. Diets tasting sweet (sucrose, 1.5% of dietary DM), sour (HCI, 1.25%), bitter (urea, l%), and salty (NaCl, 4%) were tested. Four of the cows most preferred the sweet diet, and DMI of that diet averaged 12.8% more than for the control, which was next preferred. The probability of a diet being chosen first when all diets were presented together was sucrose, .59; control, .36; urea, .04; NaCl, .01; and HCl, .003. Another experiment used the same procedure; however, the additives tested were anise, monosodium glutamate, dehydrated alfalfa meal flavor, and molasses flavor (1.48 g of flavor/kg of DM). Control and monosodium glutamate ranked first equally. The probability of choosing each flavor first in this set was .5 for the control and monosodium glutamate diets and <.01 for molasses, alfalfa, and anise. Rankings were not significantly affected by variation among cows in either experiment. Of the additives tested, only sucrose seemed to have the potential to increase intake.
Key Words: preference ranking • flavors • early lactation Holstein cows • feed intake
Submitted on November 2, 1993
Accepted on February 15, 1994
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