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Evaluation of Polyethylene Glycol Method in Determining Rumen Fluid Volume in Dairy Cows Fed Different Diets

Department of Dairy Science, University of Illinois, Urbana 91801

ABSTRACT

The use of polyethylene glycol in determining rumen fluid volume of cows fed liberal amounts of roughage and grain (control) or high-grain, low-fiber diets was studied. The polyethylene glycol method accurately measured rumen fluid volume in cows fed either diet. The rumen fluid turnover time was 5.0 and 11.2 hr for animals fed control and high-grain, low-fiber diets. For cows fed the control diet, 20.6% of the rumen fluid volume turned over every hour while the mean for cows fed the high-grain, low-fiber diet was 9.6%.

¹ Present address: U.S. Armed Forces.

² Present address: Department of Microbiology, Case Western Reserve University, Cleveland, Ohio 44100.

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