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Portal Blood Flow as Measured by the Doppler Shift Technique in Sheep Fed Chopped Forages^1,2,

University of Kentucky, Lexington 40506

Abstract

The portal blood flow (Doppler ultrasonic measurement, in ml/kg^.75) was 79 ± 11 on pre-bloom alfalfa, 70 ± 7 on alfalfa cut 2 weeks later, 57 ± 13 for mature orchardgrass hay, 64 ± 10 for mature Kenwell fescue hay, and 61 ± 7 for mature Kentucky 31 fescue. The animals were fed 90% of their previous ad libitum intake in 2-hr intervals for a 48-hr period. Portal blood flow was continuously monitored for 48-hr and manually recorded every 6 hours. Mean portal blood flow for all treatments was 1007 ± 67 ml/min which is equal to 26 ml/min/kg body weight. Dry matter intakes and portal blood flows were higher (P<.05) on the alfalfa diets than the mature grasses. Portal blood flow directly increased (P<.05) as dry matter and protein intake increased. Sixty-five percent of the variation in portal blood flow was among animals, 24% among days and 11% within days.

¹ The data in this paper are from the dissertation of the senior author, submitted to the Graduate School of the University of Kentucky in partial fulfillment of the requirements for the Ph.D. degree.

² The investigation reported in this paper (No. 74-5-60) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with approval of the Director.

³ Present address: Department of Dairy Science, Michigan State University, East Lansing 48823.

⁴ The authors gratefully acknowledge the assistance of Dr. Dal Kratzer for help with the statistical analysis of these data, Dr. Ray Tucker and his staff for assistance with the laboratory analysis and the use of the University of Kentucky experimental surgery laboratory in the surgical preparation of experimental animals.