Circadian and seasonal variation of the body temperature of sheep in a tropical environment

daSilva, Roberto Gomes; Minomo, Fernando Ryuiti

doi:10.1007/bf01212583

Cited by 26 publications

(14 citation statements)

References 22 publications

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“…The downward shift in mean body temperature that we observed in springbok amounted to ~0.3°C, an amount similar to that previously reported for unrestrained goats (Jessen and Kuhnen, 1996) and somewhat less than the 0.6 to 0.8°C reported for sheep (Bligh et al, 1965;da Silva and Minomo, 1995). The energy saving provided by a 0.3°C lowering of body temperature in winter may be a critical adaptation for springbok exposed to food scarcity and cold.…”

Section: Discussionsupporting

confidence: 66%

A year in the thermal life of a free-ranging herd of springbokAntidorcas marsupialis

Fuller

Kamerman

Maloney

et al. 2005

Journal of Experimental Biology

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We used miniature data loggers implanted in the abdominal cavity to measure core body temperatures at 30·min intervals in eight (three males, five females) adult free-ranging springbok Antidorcas marsupialis in their natural habitat, over a period of 11-13 months. The animals were subjected to a nychthemeral range of air temperature that often exceeded 20°C, with an absolute minimum temperature of -6°C and a maximum of 34°C. Abdominal temperature exhibited a low amplitude (~1.2°C) nychthemeral rhythm, with a temperature peak near sunset and a trough shortly after sunrise. The amplitude of the nychthemeral rhythm of body temperature was not correlated with the 24·h range of air temperature. Although mean 24·h body temperatures were positively correlated with corresponding air temperatures, mean daily body temperature increased, on average, by only 0.02°C per 1°C increase in air temperature, so that it was only ~0.3°C higher in summer than in winter. Mean monthly body temperatures were strongly positively correlated with photoperiod and, in parallel with changes in the time of sunrise, the times at which the minimum and maximum body temperatures occurred were shifted ~1.2·h earlier in summer than in winter. Annual and daily variations in body temperature of springbok, like those of other free-living African ungulates, therefore appear to reflect an endogenous rhythm, entrained by the light:dark cycle, but largely independent of fluctuations in the environmental thermal load. Springbok exhibit remarkable homeothermy and do not employ adaptive heterothermy to survive in their natural environment.

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Section: Discussionsupporting

confidence: 66%

A year in the thermal life of a free-ranging herd of springbokAntidorcas marsupialis

Fuller

Kamerman

Maloney

et al. 2005

Journal of Experimental Biology

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“…Study has shown that body temperature presents small circadian fluctuations during the day, which follow the same pattern of changes observed in some environmental variables (da Silva andMinomo, 1995, Feng et al, 2000). In order to prevent susceptibility to hyperthermia and improve overall summertime feedlot performance, management strategies designed to alter the peak and/or pattern of body temperature must be implemented (Davis et al 2003).…”

Section: Introductionsupporting

confidence: 52%

Comparative Study of Time Series and Multiple Regression for Modeling Dependence of Cattle Body Temperature on Environmental Variables During Heat Stress

Pathak¹,

Parkhurst²,

Arias³

et al. 2009

Conference on Applied Statistics in Agriculture

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During the summer, a challenging thermal environment is known to cause a significant reduction in food intake, growth, milk production, reproduction and even death in cattle. In this study, we attempt to characterize the relationship of cattle body temperature with several environmental variables, such as air temperature, soil surface temperature, relative humidity, solar radiation, wind speed, incoming and outgoing short and long wave radiation. For these variables, the measurements taken over time are correlated. This places severe restrictions on the applicability of many conventional statistical methods that depend on the assumption of independent and identically distributed errors. In addition to these assumptions, there is serious collinearity among several weather variables and the variables are not stationary. Commonly used multiple regression models can be misleading when predictor variables are stochastic and issues of collinearity and non-stationary are ignored. In this paper, time series analysis is used as a tool to investigate the adequacy of classical regression models. Various aspects of dynamics of cattle body temperature and its relationship to environmental variables are discussed using the frequency and time domain analysis. Finally, we present a detailed approach for fitting cattle body temperature using a transfer function model with multiple environmental variables as inputs.

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“…Daily rhythmicity of body temperature has been extensively documented in a variety of species (Piccione et al 2002a(Piccione et al , 2002b(Piccione et al , 2002c2003;G. Piccione, M. Borruso et al 2007; G. , and it is usually influenced by environmental inputs, feeding, physical activity (Hahn 1989), metabolic level and behavioural changes (Weinert & Waterhouse 2007) and it is synchronized by the light/dark cycle (daSilva & Minomo 1995). As previously observed by Piccione, Caola, and Refinetti (2005), about the body temperature rhythm in sheep, we noticed that also rumen temperature peaked at the beginning of the night.…”

Section: Discussionmentioning

confidence: 99%

Application of the iButton® for measurement of the rumen temperature circadian rhythms in lambs

Piccione

Rizzo

Casella

et al. 2013

Biological Rhythm Research

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Fazio (2014) Application of the iButton® for measurement of the rumen temperature circadian rhythms in lambs, Biological Rhythm Research, 45:3, 375-381,The aim of this study was to investigate the daily rhythm of rumen temperature (T rumen ) in lambs by means of the iButton®. Temperature data loggers were orally implanted in five, clinically healthy, male Comisana lambs (150 ± 5 days old; 31.5 ± 1 kg) under natural environmental conditions in order to record the daily course of T rumen . After six days of implantation, animals were slaughtered and iButtons® were recovered from the rumen. One-way repeated-measures analysis of variance (ANOVA), applied to evaluate the effect of time of day on T rumen , showed significant differences (p < 0.0001) in all days of monitoring. The application of the statistical analysis of cosinor indicated the existence of a significant daily rhythm (p < 0.001), with nocturnal acrophase (from 17.21 to 20.59 h). These findings provide new information on the relationship between circadian rhythms of rectal and rumen temperature, improving knowledge about their temporal organization in ovine species.

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Circadian and seasonal variation of the body temperature of sheep in a tropical environment

Cited by 26 publications

References 22 publications

A year in the thermal life of a free-ranging herd of springbokAntidorcas marsupialis

A year in the thermal life of a free-ranging herd of springbokAntidorcas marsupialis

Comparative Study of Time Series and Multiple Regression for Modeling Dependence of Cattle Body Temperature on Environmental Variables During Heat Stress

Application of the iButton® for measurement of the rumen temperature circadian rhythms in lambs

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