AJP - Regulatory, Integrative and Comparative Physiology, Vol 252, Issue 2 398-R401, Copyright © 1987 by American Physiological Society
Level of alimentation and line of breeding on oxygen uptake by ovine jejunal mucosa
R. E. Rompala, D. E. Johnson, W. V. Rumpler, H. W. Phetteplace and C. F. Parker
Targhee rams from a selected and control line of breeding were provided
with the same diet at either 100 or 40% of ad libitum feed intake levels
for 28 days. The rams were killed in a serial fashion over a 35-day period.
A sample of the jejunum mucosa was taken, and O2 consumption rates with and
without ouabain were measured. Total O2 consumption and ouabain-sensitive
respiration rates of the jejunal mucosa taken from rams of the select line
were greater than for samples taken from the control rams. Line of breeding
did not influence the percent of the total O2 consumption that was ouabain
sensitive and the proportion of the jejunum that was mucosa. Differences in
rates of total and ouabain-sensitive O2 consumption attributed to level of
feed intake were not detected as significant. Both the percentage of the
total respiration rates that was ouabain sensitive and the proportion of
the jejunum that was mucosa were greater for rams fed at high intake levels
compared with rams fed at low intake levels. Thus both breeding sheep on
the basis of improved growth potential and level of alimentation influenced
aspects of jejunal mucosa respiration that was
Na+-K+-adenosinetriphosphatase dependent.
