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Dairy Science Department, University of Wisconsin, Madison 53706
ABSTRACT
Four rumen cannulated Holstein cows were used in a Latin square design to examine the effect of supplemental calcium salt of palm oil fatty acids (.68 kg/d) or prilled fat (.68 or .91 kg/d) on DM intake, rumen fermentation, and nutrient digestibility. Basal diet contained 45% concentrate, 27.5% alfalfa silage, and 27.5% corn silage (DM basis), and treatments were balanced for calcium. Dry matter intake was similar among treatments. Ruminal pH, total VFA, and molar percentage acetate and propionate were not affected by fat supplementation. Feeding prilled fat decreased slightly ruminal molar percentage butyrate. Forage DM and neutral detergent fiber disappearance from ruminally suspended dacron bags did not differ due to treatment. For unknown reasons, total tract apparent digestibility of DM and NDF was lower when cows received the low amount but not the high amount of prilled fat. Milk yield and fat percentage were not significantly affected by treatment. Milk protein was maintained during prilled fat supplementation but decreased .13% during calcium salt of palm oil fatty acid supplementation. Both fat supplements appeared inert in the rumen and did not markedly affect nutrient digestion when supplemented at 3.5% or less of the total ration DM.
1 Research was supported by the University of Wisconsin College of Agriculture and Life Sciences, Hatch Grant 142-M937, and Milk Specialties Company, Dundee, IL.
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