...Anna S. Przybylska-Piech; Małgorzata Jefimow ABSTRACT Nonresponding Siberian hamsters ( Phodopus sungorus ) do not develop the winter phenotype of white fur, low body mass ( M b ) and spontaneous torpor in response to short photoperiod. However, their thermoregulatory response to fasting remains...

... facing metabolic trade-offs (reduced energy supply/increased energy demand) favor a regulated hypothermic response at the expense of fever. To test this hypothesis, we compared 5 day old broiler chicks exposed to fasting, cold (25°C), and fasting combined with cold with a control group fed under...

...Ignacio Simó; Mariano Faggiani; Daniel A. Fernandez; Andrés A. Sciara; Silvia E. Arranz ABSTRACT This study evaluates white muscle growth and in vivo cell proliferation during a fasting and refeeding trial, using pejerrey ( Odontesthes bonariensis ) as animal model, in order to better understand...

... feeding. However, little is known about the endocrine and immune modulation in the postprandial period of ectothermic animals. This study investigated the effects of feeding on endocrine and immune responses in the bullfrog ( Lithobates catesbeianus ). Frogs were fasted for 10 days and divided into two...

..., and therefore we investigated mitochondrial function plasticity in these states. Herein, we compared liver mitochondrial bioenergetics of the boid snake Boa constrictor during fasting and after meal intake. We fasted the snakes for 60 days, and then we fed a subgroup with 30% of their body size and evaluated...

... well-controlled laboratory conditions certainly contains caveats. Regardless, we were unable to observe any βHB in any of the dolphin livers. Additionally, a recent study utilizing untargeted metabolomics did not observe βHB in the serum of fasted dolphins ( Houser et al., 2021 ). These data show...

... associated with extended fasting. Overall, the capital–income breeding concept applies equally to male reproduction, but compared with females, there are different physical and physiological constraints that shape choice of strategy. This Commentary also highlights some key future areas that need...

...), refeeding when food becomes available (during which body mass is regained), and finally recovery (the period after which body mass has stabilized and any starvation-induced damage is repaired) ( Fig. 1 A). Several reviews summarize the responses that humans and other animals have to fasting...

... prone to using facultative heterothermy than generalists. We tested this hypothesis at the intraspecific level using male laboratory mice (C57BL/cmdb) fasted under different thermal conditions (20 and 10°C) and for different time periods (12–48 h). We predicted that variability of body temperature ( T b...

... that this species resembles bears in the preservation of bone mass and biomechanical properties during prolonged passivity and catabolism. This longitudinal study examined the osteological properties of tibiae in farm-bred raccoon dogs that were either fed or fasted ( n =6 per group) for a 10 week period...

...-living African striped mice: a negative relationship exists in the moist season but not the dry season. Triiodothyronine Metabolism Energetics Fasting Starvation Drought Thyroid hormones are important regulatory hormones that affect a multitude of physiological processes...

... and attempted to replicate these in non-parasitized fish by exposing them to treatments including immunity activation and fasting, or by pharmacologically inhibiting the stress axis. All fish were screened for the following behaviours: activity, water depth preference, sociability, phototaxis, anti-predator...

... stress, (B) 10 m approach and (C) capture in birds incubating an egg or brooding a chick. / Values are means±s.e.m. *P<0.05. Acute stress Energy cost Fasting Heart rate Penguin Reproductive value Risk assessment Seabird Animals facing environmental disturbances respond...

... the energy stores of flamingos found dead in February 2012, and compared them with those found in other bird species exposed to cold spells and/or fasting. Second, we evaluated the monthly energy requirements of flamingos across 1980–2012 using the mechanistic model Niche Mapper™. Our results show...

...Jeroen Brijs; Grant W. Hennig; Michael Axelsson; Catharina Olsson This is the first study to catalogue the diverse array of in vivo motility patterns in a teleost fish and how they are affected by feeding. Video recordings of exteriorised proximal intestine from fasted and fed shorthorn sculpin...

...Trixie N. Lee; C. Loren Buck; Brian M. Barnes; Diane M. O’Brien SUMMARY We describe two models explaining the increase in tissue nitrogen isotope ratios (δ 15 N) that occurs during fasting in animals. The catabolic model posits that protein breakdown selectively removes the lighter isotope...

... and patterns of nutrient deposition during development. In species that undergo extended fasts during development, metabolic strategies for fuel use have the potential to influence future reproductive success by directly impacting somatic growth and acquisition of traits required for successful breeding. We...

...Jose Abraham Viscarra; José Pablo Vázquez-Medina; Ruben Rodriguez; Cory D. Champagne; Sean H. Adams; Daniel E. Crocker; Rudy M. Ortiz SUMMARY The northern elephant seal pup ( Mirounga angustirostris ) undergoes a 2–3 month post-weaning fast, during which it depends primarily on the oxidation...

... hydrodynamic radius. Response patterns were similar in seawater and freshwater preparations, though water absorption and PEG-900 permeability were greater in the latter. Despite up to 4-fold variations in absorptive water flux associated with feeding and fasting (highest at 1–3 h, lowest at 12–24 h...

...José Pablo Vázquez-Medina; Daniel E. Crocker; Henry Jay Forman; Rudy M. Ortiz SUMMARY Elephant seals are naturally adapted to survive up to three months of absolute food and water deprivation (fasting). Prolonged food deprivation in terrestrial mammals increases reactive oxygen species (ROS...