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Journal of Animal Science, Vol 73, Issue 9 2548-2557, Copyright © 1995 by American Society of Animal Science

JOURNAL ARTICLE

Influence of a three-day feed and water deprivation period on gut fill, tissue weights, and tissue composition in mature wethers

N. A. Cole
ARS, USDA, Bushland, TX 79012, USA.

Fourteen mature wethers (average BW 71.8 +/- .86 kg) were used to study the effects of feed and water deprivation on the quantity and composition of gastrointestinal tract (GIT) contents and tissues. Sheep (seven/treatment) were randomly assigned to one of two treatments: 1) limit fed 1,400 g/d of a pelleted diet or 2) deprived of feed and water for 3 d. Before euthanasia, sheep were infused i.v. with Evans blue, sodium thiocyanate, and antipyrine to determine plasma, extracellular, and total body water, respectively. Blood samples were obtained for 4 h after the infusions. Sheep were killed by injection of a lethal dose of a general anesthetic and organs were immediately removed, weighed, and sampled. Compared with controls, unfed sheep lost 7.1 kg (9.9%; P < .05) of their BW during the 3-d deprivation period, of which 21.1% was from the stomach contents, 28.1% (P < .05) was from the GIT (stomach + intestine) contents, and 6.7% (P < .02) was from GIT tissues. The weight loss of the liver, lungs, heart, and kidneys each accounted for less than 1% of the total weight loss. Of the total weight loss, 80% (P < .09) was body water. Of total body water loss, 57% (P < .20) was from the intracellular compartment and 29% (P < .06) was from the GIT contents. Total Ca, Na, Mg, Cu, Fe, and Zn losses via fecal + urinary excretion were less or equal to losses from the GIT contents.(ABSTRACT TRUNCATED AT 250 WORDS)


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Copyright © 1995 by the American Society of Animal Science.