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• W2217459281 abstract "Northern ungulates acclimatize to winter conditions with restricted food supply and unfavorable weather conditions by reducing energy expenditure and voluntary food intake. We investigated in a study on red deer whether rates of peptide and glucose transport in the small intestines are also reduced during winter as part of the thrifty phenotype of winter-acclimatized animals, or whether transport rates are increased during winter in order to exploit poor forage more efficiently. Our results support the latter hypothesis. We found in a feeding experiment that total energy intake was considerably lower during winter despite ad libitum feeding. Together with reduced food intake, mass of visceral organs was significantly lower and body fat reserves were used as metabolic fuel in addition to food. However, efficacy of nutrient absorption seemed to be increased simultaneously. Extraction of crude protein from forage was higher in winter animals, at any level of crude protein intake, as indicated by the lower concentration of crude protein in feces. In line with these in vivo results, Ussing chamber experiments revealed greater electrogenic responses to both peptides and glucose in the small intestines of winter-acclimatized animals, and peptide uptake into jejunal brush-border membrane vesicles was increased. We conclude that reduced appetite of red deer during winter avoids energy expenditure for unproductive search of scarcely available food and further renders the energetically costly maintenance of a large gut and visceral organs unnecessary. Nevertheless, extraction of nutrients from forage is more efficient in the winter to attenuate an inevitably negative energy balance." @default.
• W2217459281 created "2016-06-24" @default.
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• W2217459281 date "2015-08-01" @default.
• W2217459281 modified "2023-09-29" @default.
• W2217459281 title "Contrary seasonal changes of rates of nutrient uptake, organ mass, and voluntary food intake in red deer (<i>Cervus elaphus</i>)" @default.
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• W2217459281 doi "https://doi.org/10.1152/ajpregu.00084.2015" @default.
• W2217459281 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4525327" @default.
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