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The effects of litter size, sex, age, body weight, dam age and genetic selection for cold resistance on the physiological responses to cold exposure of scottish blackface lambs in a progressively cooled water bath

Published online by Cambridge University Press:  02 September 2010

A. W. Stott  and
J. Slee
A. W. Stott
Affiliation:
AFRCInstitute of Animal Physiology and Genetics Research‡, West Mains Road, Edinburgh EH9 3JQ
J. Slee
Affiliation:
AFRCInstitute of Animal Physiology and Genetics Research‡, West Mains Road, Edinburgh EH9 3JQ
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Abstract

The resistance to body cooling of 594 newborn Scottish Blackface lambs was measured in a water bath during a programme of upwards and downwards genetic selection. Cold resistance was defined as the time taken for rectal temperature to fall to 35°C in the water bath.

Upwards selection produced increased cold resistance which was genetically associated with increased skin thickness, increased total body insulation and greater persistence of high metabolic rate during cold exposure. The first two correlated responses to selection were more pronounced in twins than in singles.

High cold resistance was phenotypically, but not genetically, associated with greater body weight, increased coat depth and higher levels of cold-induced metabolic rate (heat production). Single lambs showed higher weight-adjusted metabolic rates and higher cold resistance than twins. Singles recovered from hypothermia faster than twins in the low selection line only.

Female lambs showed higher metabolic rate (whether weight-adjusted or not) and greater total body insulation than males. Their greater cold resistance was not quite significant. Increasing age (range 0·3 to 36 h) was associated with a small but significant decline in cold resistance.

Thermoneutral metabolic rate was proportional to body surface area, whereas peak metabolic rate was proportional to body weight such that peak metabolic rate per unit body weight was independent of changes in body weight. These findings are discussed in relation to lamb survival.

Type
Research Article
Information
Animal Production , Volume 45 , Issue 3 , December 1987 , pp. 477 - 491
Copyright
Copyright © British Society of Animal Science 1987

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References

REFERENCES

Alexander, G. 1961. Temperature regulation in the newborn lamb. III. Effect of environmental temperature on metabolic rate, body temperatures and respiratory quotient. Australian Journal of Agricultural Research 12: 1152–1174.CrossRefGoogle Scholar
Alexander, G. 1962. Temperature regulation in the newborn lamb. V. Summit metabolism. Australian Journal of Agricultural Research 13: 100–121.CrossRefGoogle Scholar
Alexander, G. 1974. Heat loss from sheep. In Heat Loss from Animals and Man (ed. Monteith, J. L. and Mount, L. E.), pp. 173–203. Buttcrworths. London.CrossRefGoogle Scholar
Alexander, G. 1978. Quantitative development of adipose tissue in foetal sheep. Australian Journal of Biological Sciences 31: 489–503.CrossRefGoogle ScholarPubMed
Alexander, G. 1979. Cold thermogenesis. In Environmental Physiology III (ed. Robertshaw, D.), International Review of Physiology 20: 45–155.Google ScholarPubMed
Alexander, G. and Bell, A. W. 1975. Maximum thermogenic response to cold in relation to the properties of brown adipose tissue and skeletal muscle in the body and to other parameters. Biology of the Neonate 26: 182–194.CrossRefGoogle Scholar
Alexander, G. and Williams, D. 1968. Shivering and non-shivering thermogenesis during summit metabolism in young lambs. Journal of Physiology, London 198: 251–276.CrossRefGoogle ScholarPubMed
Andrews, J. F. and Mercer, J. B. 1985. Thermoregulation in the newborn lamb: the first 36 hours. In Factors Affecting the Survival of Newborn Lambs (ed. Alexander, G., Barker, J. D. and Slee, J.). pp. 11–20. Commission of the European Communities. Brussels.Google Scholar
Bannatyne, C. C. 1977. Perinatal losses in traditional hill sheep. In Perinatal Losses in Lambs, Symposium, Stirling University, pp. 17–19. East of Scotland College of Agriculture, Edinburgh.Google Scholar
Cue, R. I. 1981. A genetic analysis of lamb mortality in hill sheep. Ph.D. Thesis, University of Edinburgh.Google Scholar
Eales, F. A., Gilmour, J. S., Barlow, R. M. and Small, J. 1982. Causes of hypothermia in 89 lambs. Veterinary Record 110: 118–120.CrossRefGoogle ScholarPubMed
Eales, F. A. and Small, J. 1980. Summit metabolism in newborn lambs. Research in Veterinary Science 29: 211–218.CrossRefGoogle ScholarPubMed
Gunn, R. G. and Robinson, J. F. 1963. Lamb mortality in Scottish hill flocks. Animal Production 5: 67–76.Google Scholar
Harker, D. B. 1977. Perinatal diseases in intensively reared lambs. In Perinatal Losses in Lambs, Symposium, Stirling University, pp. 20–24. East ol Scotland College of Agriculture, Edinburgh.Google Scholar
Harvey, W. R. 1972. Least squares and maximum likelihood general purpose program. Ohio State University, Columbus. (Mimeograph).Google Scholar
Houston, D. C. and Maddox, J. G. 1974. Causes of mortality among young Scottish Blackface lambs. Veterinary Record 95: 575.CrossRefGoogle ScholarPubMed
Johnston, W. S. 1977. Caithness sheep loss survey: perinatal lamb losses. In Perinatal Losses in Lambs, Symposium, Stirling University, pp. 10–13. East of Scotland College of Agriculture, Edinburgh.Google Scholar
Kleiber, M. 1961. The Fire of Life; an Introduction to Animal Energetics. John Wiley, London.Google Scholar
Mercer, J. B., Andrews, J. F. and Szekely, M. 1979. Thermoregulatory responses in newborn lambs during the first 36 hours of life. Journal of Thermal Biology 4: 239–245.CrossRefGoogle Scholar
Purser, A. F. and Young, G. B. 1959. Lamb survival in two hill flocks. Animal Production 1: 85–91.Google Scholar
Samson, D. E. 1982. Genetic aspects of resistance to hypothermia in relation to neonatal lamb survival. Ph.D. Thesis, University of Edinburgh.Google Scholar
Samson, D. E. and Slee, J. 1981. Factors affecting resistance to induced body cooling in newborn lambs of 10 breeds. Animal Production 33: 59–65.Google Scholar
Saunders, R. W. 1977. Perinatal lamb mortality associated with lowland grassland systems. In Perinatal Losses in Lambs, Symposium, Stirling University, pp. 5–9. East of Scotland College of Agriculture. Edinburgh.Google Scholar
Slee, J. 1979. Mortality and resistance to hypothermia in young lambs. In Biometeorological Survey. Vol. I (ed. Tromp, S. W. and Bouma, J. J.), pp. 60–65. Heyden. london.Google Scholar
Slee, J. 1981. A review of genetic aspects of survival and resistance to cold in newborn lambs. Livestock Production Science 8: 419–429.CrossRefGoogle Scholar
Slee, J. and Stott, A. W. 1986. Genetic selection for cold resistance in Scottish Blackface lambs. Animal Production 43: 397–404.Google Scholar
Speedy, A. W., Linklater, K. A., Mackenzie, C. G., Macmillan, D. R. and Blance, E. W. 1977. A survey of perinatal mortality in upland sheep flocks in south-east Scotland. In Perinatal Losses in Lambs, Symposium, Stirling University, pp. 14–16. East of Scotland College of Agriculture, Edinburgh.Google Scholar
Stott, A. W. 1983. Genetic and physiological factors affecting thermoregulation and resistance to body cooling in newborn lambs. Ph. D. Thesis, University of Edinburgh.Google Scholar
Stott, A. W. 1985. Effect of previous cold exposure on the cold resistance of young lambs. Progress in Biometeorology 2: 59–66.Google Scholar
Stott, A. W. and Slee, J. 1985. The effect of environmental temperature during pregnancy on thermoregulation in the newborn lamb. Animal Production 41: 341–347.Google Scholar
Sykes, A. R., Griffiths, R. G. and Slee, J. 1976. Influence of breed, birth weight and weather on the body temperature of newborn lambs. Animal Production 22: 395–402.Google Scholar
Wiener, G. and Hayter, S. 1975. Maternal performance in sheep as affected by breed, crossbreeding and other factors. Animal Production 20: 19–30.Google Scholar
Wiener, G., Woolliams, C. and Macleod, N. S. M. 1983. The effects of breed, breeding system and other factors on lamb mortality. 1. Causes of death and effects on the incidence of losses. Journal of Agricultural Science, Cambridge 100: 539–551.CrossRefGoogle Scholar