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- W2046668570 abstract "We conducted experiments with captive female elk (Cervus elaphus) to explore the utility of allantoin:creatinine (A:C) ratios as a noninvasive index of nutrition in free-ranging ungulates. Pens of animals were assigned to one of four dietary treatments, each treatment being given to 6 animals. One treatment involved gradually increasing the daily metabolizable energy intake (MEI) from approximately 650 to 1200 kJ metabolizable energy (ME)/kg body mass (BM) 0.75 in weekly increments over 8 weeks. In a second treatment, daily MEI was decreased in a similar manner from approximately 900 to 250 kJ ME/kg BM 0.75 . Urine samples (96 in total) were collected from each animal in these treatments 5 days after each change in diet. Two additional treatments involved relatively large and abrupt changes in daily diet ranging from 120 to 500 kJ ME/kg BM 0.75 , with successive diets being alternately increased and decreased at 2-week intervals for 10 weeks. Urine samples (179 in total) were collected from each animal 3, 5, and 13 days after a dietary change was initiated. The underlying relation between A:C ratio and MEI was consistent among the four treatments and indicated that the urinary A:C ratio is a reliable index of dietary intake in elk across a variety of dietary regimes. A:C ratios responded relatively quickly to changes in diet, indexing the dietary intake of the animals during a several-day period immediately prior to the time the urine was voided. The results of this and previous studies indicate that the urinary A:C ratio has significant potential as a nutritional index for wild ruminants; however, we recommend additional research before the use of A:C ratios is integrated into ecological or management applications." @default.
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- W2046668570 date "1997-09-01" @default.
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- W2046668570 title "Evaluation of the urinary allantoin:creatinine ratio as a nutritional index for elk" @default.
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- W2046668570 doi "https://doi.org/10.1139/z97-775" @default.
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