J. Anim Sci.
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Journal of Animal Science, Vol 73, Issue 7 2063-2070, Copyright © 1995 by American Society of Animal Science

JOURNAL ARTICLE

Insulin and(or) dexamethasone regulation of glucose and acetate utilization in ovine and bovine adipose tissue explants incubated for seven days

Y. Chilliard and Y. Faulconnier
Laboratoire Sous-Nutrition des Ruminants, INRA Theix, Saint Genes Champanelle, France.

An in vitro system was used to study the regulation of glucose and acetate utilization by bovine and ovine adipose tissue (AT). Adult nonlactating, nonpregnant cows (n = 5) and ewes (n = 5) were given limited amounts of feed for 8 to 10 d, then overfed for 10 (ewes) or 21 (cows) d. Perirenal AT explants were incubated for 7 d. The effect of 2 mU/mL of insulin on glucose utilization was significant in bovine but not in ovine AT during the 1st d in vitro, whereas the relationship was reversed from the 4th d of incubation. The effect of insulin on acetate utilization was significant in bovine but not in ovine AT. The addition of dexamethasone (DEX, 100 nM) to the insulin-supplemented medium increased (P < .05) glucose and acetate utilization by ovine AT. However, DEX did not affect substrate utilization by bovine AT in the presence of insulin. The DEX alone decreased glucose and acetate utilization by bovine and ovine AT during the first 4 d of incubation. So, the effects of insulin and(or) DEX on substrate utilization differed with species and incubation time.


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C. D. Gilbert, D. K. Lunt, R. K. Miller, and S. B. Smith
Carcass, sensory, and adipose tissue traits of Brangus steers fed casein-formaldehyde-protected starch and/or canola lipid
J Anim Sci, October 1, 2003; 81(10): 2457 - 2468.
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Copyright © 1995 by the American Society of Animal Science.