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Fat-tailed Awassi and German Mutton Merino sheep under semi-arid conditions: 3. Body temperatures and panting rate

Published online by Cambridge University Press:  27 March 2009

A. A. Degen
A. A. Degen
Affiliation:
Comparative Medicine of Arid Zones, The Institute for Desert Research, Ben-Gurion University of the Negev, Sede Boger Campus, Israel
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Summary

Rectal, external auditory meatus and skin temperatures and panting rates were measured in native fat-tailed Awassi and imported German Mutton Merino (GMM) sheep. The Awassi evolved under desert conditions, have a localized fat deposit, coarse carpet wool, long pendulous ears and long, spiral horns (males). In contrast, the GMM evolved under temperate conditions, have well-distributed fat, medium fine wool, short, straight ears and are polled. The study was carried out during the summer in the northern part of the Negev desert.

The mean daily rectal temperature fluctuation was higher (P < 0·01) in the GMM than in the Awassi (1·78 °C v. 1·08 °C). The external auditory meatus temperature was lower than the rectal temperature by 1·5 °C in the GMM and by 1·7 °C in the Awassi, indicating a cooler brain temperature. The maximum skin temperature was similar to the maximum rectal temperature in both breeds, thus sweating was of little importance. The panting rate of the GMM increased fivefold (40·6–199·4 pants/min) whilst the rate of the Awassi increased fourfold (35·3–135·0 pants/min). There was no between-breed difference in either the rectal temperature or panting rate until 25–30 °C ambient temperature and it is thought that the higher rectal temperature of the GMM at this ambient temperature might have triggered off the higher panting rate. It seems that the GMM use panting to a greater extent than the Awassi whereas the Awassi dissipate heat through the skin more efficiently than the GMM. It is concluded that both breeds are thermostable, much of the between-breed difference in rectal temperature can be attributed to their anatomical differences.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 89 , Issue 2 , October 1977 , pp. 399 - 405
Copyright
Copyright © Cambridge University Press 1977

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References

Baker, M. A. & Hayward, J. N. (1968). The influence of the nasal mucosa and the carotid rete upon hypothalamio temperature in the sheep. Journal of Physiology, London 198, 561–79.CrossRefGoogle Scholar
Baker, M. A., Stocking, R. A. & Meehan, J. P. (1972). Thermal relationship between the tympanic membrane and hypothalamus in conscious cat and monkey. Journal of Applied Physiology 32, 739–42.CrossRefGoogle Scholar
Berman, A. & Morag, M. (1971). Nychthermeal patterns of thermoregulation in high yielding dairy cows in a hot dry near-natural climate. Australian Journal of Agricultural Research 22, 671–80.CrossRefGoogle Scholar
Bligh, J. (1970). Species differences in the tolerance to meteorological stress, due to differences in function and organisms. International Journal of Biometeorology 14, Supplement 4, 149–56.Google Scholar
Bligh, J., Ingram, D. L., Keynes, R. D. & Robinson, S. Q.(1965). The deep body temperature of an unrestrained Welsh Mountain sheep, recorded by a radiotelemetric technique during a 12-month period. Journal of Physiology, London 176, 136–44.CrossRefGoogle ScholarPubMed
Brown, G. D. (1971). Thermal status of sheep at pasture in Western New South Wales. Australian Journal of Agricultural Research 22, 797–808.CrossRefGoogle Scholar
Degen, A. A. (1976). Physiological responses of native fat-tailed Awassi and imported German Mutton Merino sheep to desert conditions. Ph.D. thesis, University of Tel Aviv.Google Scholar
Degen, A. A. (1977). Fat-tailed Awassi and German Mutton Merino sheep under semi-arid conditions. 1. Total body water, its distribution and water turnover. Journal of Agricultural Science, Cambridge 88, 693—8.CrossRefGoogle Scholar
Epstein, H. (1971). The Origin of the Domestic Animals of Africa, vol. II. New York: Africana Publishing Corporation.Google Scholar
Eyal, E. (1963a). Shorn and unshorn Awassi sheep. I. Body temperature. Journal of Agricultural Science, Cambridge 60, 159–68.CrossRefGoogle Scholar
Eyal, E. (1963b). Shorn and unshorn Awassi sheep. IV. Skin temerpatures and changes in the temperatures and humidity in the fleece and its surface. Journal of Agricultural Science, Cambridge 60, 183–93.CrossRefGoogle Scholar
Finci, M. (1957). The improvement of the Awassi breed of sheep in Israel. Bulletin of the Research Council of Israel 6 B, 1–106.Google Scholar
Johnson, K. G. (1971). Body temperature lability in sheep and goats during short-term exposures to heat and cold. Journal of Agricultural Science, Cambridge 77, 267–72.CrossRefGoogle Scholar
Mason, I. L. (1967). The Sheep Breeds of the Mediterranean. Commonwealth Agricultural Bureaux, Farnham Royal, Bucks, England.Google Scholar
Morag, M., Degen, A. A. & Popliker, F. (1973). The reproductive performance of German Mutton Merino ewes in a hot arid climate. Zeitschrift für Tierzüchtung und Züchtungsbiologie 89, 340–5.CrossRefGoogle Scholar
Quartermain, A. R. (1964). Heat tolerance in Southern Rhodesian sheep fed on a maintenance diet. Journal of Agricultural Science, Cambridge 62, 3331–9.CrossRefGoogle Scholar
Rathore, A. K. (1970). Physiological reaotions of rams exposed in the hot room at various temperatures. Journal of Agricultural Science, Cambridge 62, 565–7.Google Scholar
Schmidt-Nielsen, K. (1964). Desert Animals. Oxford University Press.Google Scholar
Schmidt-Nielsen, K. (1972). Panting and heat loss. In How Animals Work. Cambridge University Press.CrossRefGoogle Scholar
Schmidt-Nielsen, K., Schmidt-Nielsen, B., Jarnum, S. A. & Hoott, T. R. (1957). Body temperature of the camel and its relation to water economy. American Journal of Physiology 188, 103–12.CrossRefGoogle ScholarPubMed
Symington, R. B. (1960). Studies on the adaptability of three breeds of sheep to a tropical environment modified by altitude. I. The annual fluctuation in body temperature and body temperature increase between 6.30 a.m. and 12.30 p.m. Journal of Agricultural Science, Cambridge 55, 287–94.CrossRefGoogle Scholar
Taneja, G. C. (1973). Water Economy in Sheep, pp. 95–132. Proceedings: Water Animal Relations (ed. Mayland, H. F.), Kimberly, Idaho.Google Scholar
Taylor, C. R. (1966). The vascularity and possible thermoregulatory function of the horns on goats. Physiological Zoology 39, 127–9.CrossRefGoogle Scholar
Taylor, C. R. (1969). The eland and the oryx. Scientific American 220, 88–95.CrossRefGoogle ScholarPubMed
Taylor, C. R. (1970). Dehydration and heat: effects on temperature regulations of East-African ungulates. American Journal of Physiology 219, 1136–9.CrossRefGoogle ScholarPubMed
Taylor, C. R. (1972). The desert gazelle – paradox resolved. Symposium of the Zoological Society, London 31, 215–27.Google Scholar