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Variation in Portal Blood Flow Measured by Dye-Dilution in Young Calves¹

Department of Animal Science, Iowa State University, Ames 50010

ABSTRACT

Portal blood flow in seven calves was calculated by computer analysis of indocyanine green dye-dilution curves. The range, mean and standard error for blood flow in ml/(min x kg body weight) for each calf were 8.1 to 38.0, 16.6 ± 1.4; 17.7 to 66.5, 46.7 ± 5.9; 24.1 to 60.7, 35.0 ± 3.1; 23.9 to 60.1, 41.1 ± 4.0; 22.0 to 119.2, 61.5 ± 2.7; 26.1 to 74.6, 47.2 ± 2.4; 32.1 to 35.8, 34.3 ± 0.4. Blood flow was highly variable among animals, and within animals throughout the day and from day to day. Blood flow for a given time should be calculated as the average of a minimum of three values obtained within 15 minutes and should not represent the flow at any other time. Blood flow values determined for a given calf are applicable only to studies with that calf.

¹ Journal Paper J-6709 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project 1324. Supported in part by funds provided by Grant HE-04969, Department of Health, Education and Welfare.

² AFRRI, National Naval Medical Center, Bethesda, Maryland 20014.

³ Laboratory of Nutrition and Endocrinology, National Institute of Arthritis and Metabolic Diseases, National Institutes of Health, Bethesda, Maryland 20014.