Journal of Animal Science, Vol 73, Issue 3 843-852, Copyright © 1995 by American Society of Animal Science

JOURNAL ARTICLE

Visceral oxygen consumption during chronic feed restriction and realimentation in sheep

H. C. Freetly, C. L. Ferrell, T. G. Jenkins and A. L. Goetsch
U.S. Meat Animal Research Center, ARS, USDA, Clay Center, NE 68933, USA.

The objectives of this study were twofold: first, to estimate the time required to reach equilibrium in splanchnic tissue oxygen (O2) consumption rates after a feed restriction that maintained BW; and second, to estimate the time following a subsequent realimentation required to reach equilibrium. Catheters were placed in a cranial mesenteric vein, the portal vein, a branch of the hepatic vein, and the abdominal aorta of six wethers. Wethers were allowed to eat ad libitum 2 h/d. At 49.9 +/- 2.7 kg two wethers were assigned to the high group, which continued to receive the 2 h/d ad libitum meal. Four wethers were assigned to the low group for 80 d and were restricted to 70% of the average meal each consumed during the week before restriction. Hepatic and portal-drained viscera (PDV) O2 consumption rates were determined the day before restriction (day 0) and on d 10, 24, 38, 52, 66, and 80 of restriction. After d 80 of restriction, wethers assigned to the low group were fed the 2 h/d ad libitum meal, and hepatic and PDV O2 consumption rates were determined on d 7, 14, 28, and 42 of realimentation. At 80 d of restriction, PDV and hepatic O2 consumptions were 60 and 65%, respectively, of the d-0 rate. Hepatic tissue required 21 d and PDV required 29 d to be within 5% of the new steady-state O2 consumption rates after restriction.

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