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Contrary seasonal changes of rates of nutrient uptake, organ mass, and voluntary food intake in red deer (Cervus elaphus).
Am J Physiol Regul Integr Comp Physiol. 2015 Aug 01; 309(3):R277-85.AJ

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.

Authors+Show Affiliations

Research Institute of Wildlife Ecology, Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Vienna, Austria; and walter.arnold@vetmeduni.ac.at.Research Institute of Wildlife Ecology, Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Vienna, Austria; and.Institute of Physiology, University of Veterinary Medicine, Hannover, Germany.Institute of Physiology, University of Veterinary Medicine, Hannover, Germany.Research Institute of Wildlife Ecology, Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Vienna, Austria; and Institute of Physiology, University of Veterinary Medicine, Hannover, Germany.Institute of Physiology, University of Veterinary Medicine, Hannover, Germany.Institute of Physiology, University of Veterinary Medicine, Hannover, Germany.Institute of Physiology, University of Veterinary Medicine, Hannover, Germany.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26017492

Citation

Arnold, Walter, et al. "Contrary Seasonal Changes of Rates of Nutrient Uptake, Organ Mass, and Voluntary Food Intake in Red Deer (Cervus Elaphus)." American Journal of Physiology. Regulatory, Integrative and Comparative Physiology, vol. 309, no. 3, 2015, pp. R277-85.
Arnold W, Beiglböck C, Burmester M, et al. Contrary seasonal changes of rates of nutrient uptake, organ mass, and voluntary food intake in red deer (Cervus elaphus). Am J Physiol Regul Integr Comp Physiol. 2015;309(3):R277-85.
Arnold, W., Beiglböck, C., Burmester, M., Guschlbauer, M., Lengauer, A., Schröder, B., Wilkens, M., & Breves, G. (2015). Contrary seasonal changes of rates of nutrient uptake, organ mass, and voluntary food intake in red deer (Cervus elaphus). American Journal of Physiology. Regulatory, Integrative and Comparative Physiology, 309(3), R277-85. https://doi.org/10.1152/ajpregu.00084.2015
Arnold W, et al. Contrary Seasonal Changes of Rates of Nutrient Uptake, Organ Mass, and Voluntary Food Intake in Red Deer (Cervus Elaphus). Am J Physiol Regul Integr Comp Physiol. 2015 Aug 1;309(3):R277-85. PubMed PMID: 26017492.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Contrary seasonal changes of rates of nutrient uptake, organ mass, and voluntary food intake in red deer (Cervus elaphus). AU - Arnold,Walter, AU - Beiglböck,Christoph, AU - Burmester,Marion, AU - Guschlbauer,Maria, AU - Lengauer,Astrid, AU - Schröder,Bernd, AU - Wilkens,Mirja, AU - Breves,Gerhard, Y1 - 2015/05/27/ PY - 2015/03/04/received PY - 2015/05/26/accepted PY - 2015/5/29/entrez PY - 2015/5/29/pubmed PY - 2015/10/17/medline KW - active transport KW - glucose transport KW - nutrients KW - peptide transport KW - seasonal acclimatization SP - R277 EP - 85 JF - American journal of physiology. Regulatory, integrative and comparative physiology JO - Am J Physiol Regul Integr Comp Physiol VL - 309 IS - 3 N2 - 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. SN - 1522-1490 UR - https://www.unboundmedicine.com/medline/citation/26017492/Contrary_seasonal_changes_of_rates_of_nutrient_uptake_organ_mass_and_voluntary_food_intake_in_red_deer__Cervus_elaphus__ L2 - https://journals.physiology.org/doi/10.1152/ajpregu.00084.2015?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -