Resistance to Extreme Temperatures in Connection With Different Diets

Dugal, L. P.; Leblond, C. P.; Therien, M

doi:10.1139/cjr45e-026

Cited by 23 publications

(5 citation statements)

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“…if these mice are exposed to freezing temperatures in individual cages without nesting material. This experiment does not, however, show whether or not these mice will choose the most beneficent diet as will the white rat (Dugal 1945). Hatfield (1940) has observed that food consumption of P. manicula.tus increases with decreasing temperature.…”

Section: Role Played By Dietary Fat In Peromyscus Exposed To Low Tempmentioning

confidence: 72%

Role Played by Dietary Fat in Peromyscus Exposed to Low Temperatures

Eskridge¹

1958

Ecology

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Section: Role Played By Dietary Fat In Peromyscus Exposed To Low Tempmentioning

confidence: 72%

Role Played by Dietary Fat in Peromyscus Exposed to Low Temperatures

Eskridge¹

1958

Ecology

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“…The lipid intake of CESO was the highest of the four groups of rats. High-fat diets are beneficial to animals exposed to cold [5,15,18]. That is, high-fat diets improve cold tolerance, increase the survival rate in cold environments, and enhance the function of brown adipose tissue mitochondria.…”

Section: Discussionmentioning

confidence: 99%

“…High-fat diet feeding is beneficial to animals exposed to cold [5,15,18]. We examined the SO intake of rats exposed to cold in a free-feeding condition.…”

Section: Discussionmentioning

confidence: 99%

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Preference for Safflower Oil in Rats Exposed to a Cold Environment under Free-Feeding Conditions

Saitoh

Ishii

Takewaki

et al. 2005

The Journal of Veterinary Medical Science

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ABSTRACT. There are several benefits to a high-fat diet for animals exposed to cold, including improved tolerance to severe cold conditions and increased survival rates in cold environments. It is therefore of interest to examine whether animals exposed to cold will selectively consume lipids. We examined the intake of safflower oil (SO) by rats exposed to cold (4 ± 2°C) under a feeding condition in which the rats were given free access to SO. Rats exposed to cold consumed more SO than those housed at 25 ± 2°C. This finding suggests that rats prefer SO in a cold environment. There was no significant difference in the ratio of calories of SO ingested to that of matter (standard laboratory chow plus SO) ingested between rats exposed to cold and those at 25 ± 2°C. The high SO intake also affected cold tolerance and metabolite kinetics in the rats. Factors that affected the SO intake of rats exposed to cold are also discussed. KEY WORDS: cold exposure, cold tolerance, interscapular adipose tissue, rats, safflower oil.J. Vet. Med. Sci. 67 (7): [653][654][655][656][657][658] 2005 There are several benefits to a high-fat diet for animals exposed to cold, including improved tolerance to severe cold conditions and increased survival rates in cold environments [5,15,18]. Previous studies have examined diets that included a higher portion of lipid than standard diets. Thus, animals were forced to eat a high-fat diet to satisfy their energy needs and to obtain essential nutrients. However, whether animals prefer lipids in a cold environment has not been studied. It is therefore of interest to examine whether animals exposed to cold will selectively consume lipids. Safflower oil (SO) has often been used as a lipid in experiments related to diet [8, 20-22, 26, 27]. Thus, in the present study we examined the SO intake of rats exposed to cold (4 ± 2°C) under a free-feeding condition in which both SO and a standard laboratory chow were available ad libitum. We also measured rectal temperature upon acute cold exposure (ACE: -20°C in a cold room, 60 min) to evaluate the effect of ingestion of SO on cold tolerance of rats compared with rats not given SO [15]. Changes in the blood levels of glucose, nonesterified fatty acids (NEFA), and β-hydroxybutyrate caused by ACE were also measured to evaluate changes in the use of these substances by cold exposure [15]. The interscapular brown adipose tissue (IBAT) was weighed to assess its generation of heat [10,15]. MATERIALS AND METHODSMale Slc: Wistar rats 9 week of age (Japan SLC, Shizuoka, Japan) were divided into 4 groups with 2 rats per cage (Fig. 1). Two groups were housed at room temperature (25 ± 2°C) for 4 week and then exposed to cold (4 ± 2°C, using a cold room) for the following 3 week period. The 1st group served as controls exposed to the cold environment (CECNT), and the 2nd group had access to SO (CESO). The other 2 groups were fed at room temperature for 7 week.One group served as controls housed at room temperature (RTCNT), and the other group had access to SO (RTSO). A...

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“…Thus in one series of experiments, rats kept in the cold tended to select fat, while those exposed to heat preferred carbohydrates and developed a great appetite for salts. As judged by comparison with rats which were not allowed free food-selection, it appears that the voluntarily chosen foods are actually favorable for resistance to low and high temperatures respectively (67). Experiments on mice showed that total foodconsumption increases at low (10°C.)…”

Section: Systemic Stressmentioning

confidence: 94%

The General-Adaptation-Syndrome in its Relationships to Neurology, Psychology, and Psychopathology.

Selye

Contributions Toward Medical Psychology: Theory and Psychodiagnostic Methods Vol 1.

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Resistance to Extreme Temperatures in Connection With Different Diets

Cited by 23 publications

References 0 publications

Role Played by Dietary Fat in Peromyscus Exposed to Low Temperatures

Role Played by Dietary Fat in Peromyscus Exposed to Low Temperatures

Preference for Safflower Oil in Rats Exposed to a Cold Environment under Free-Feeding Conditions

The General-Adaptation-Syndrome in its Relationships to Neurology, Psychology, and Psychopathology.

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