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Comparative aspects of resistance to body cooling in newborn lambs and kids

Published online by Cambridge University Press:  02 September 2010

S. Müller  and
S. N. McCutcheon
S. Müller
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
S. N. McCutcheon
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
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Abstract

The aim of this study was to compare responses to cold stress in newborn lambs and kids. Two experiments were conducted in a climatic chamber with controlled air temperatures and artificial wind and rain. The first experiment involved 25 Poll Dorset × (Border Leicester × Romney) lambs and 16 Angora × feral kids while the second involved 30 Suffolk × (Border Leicester × Romney) lambs and 26 Angora × feral kids. Rectal temperatures were measured and the rate of decline in rectal temperature estimated in both experiments. In the second experiment, metabolic rate was also measured and coat characteristics (birth coat depth and wool weight per unit area of skin) were examined. The effects of birth rank and sex on resistance to cold exposure and their interaction with species were examined in both experiments.

In experiment 1, kids had lower rectal temperatures than lambs at the start of the test but there was no species effect on the rate of decline in rectal temperature. In experiment 2, kids exhibited a significantly greater rate of decline in rectal temperature than did lambs. This difference in species effect between the experiments reflected primarily a greater rate of body cooling in the Poll Dorset-cross lambs (experiment 1) than in the Suffolk-cross lambs (experiment 2) rather than a difference between the kids in the two experiments. Additionally, in experiment 2, metabolic rate per unit live weight was significantly lower in the kids than in the lambs. No differences were apparent between the species in coat characters. Multiple-born lambs and kids were found to exhibit a significantly greater rate of decline in rectal temperature than singles, but only marginal differences in heat production were observed between the birth ranks. No significant effects of sex on resistance to cold stress were found in this study. Effects of birth rank and sex were additive with those of species. It is concluded that a combination of low heat production capacity and small body size is responsible for the generally poor responses of newborn kids to cold stress but there is probably little difference between lambs and kids in the insulative value of their birth coats.

Keywords

hypothermiakidsIambsmetabolism
Type
Research Article
Information
Animal Production , Volume 52 , Issue 2 , April 1991 , pp. 301 - 309
Copyright
Copyright © British Society of Animal Science 1991

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References

REFERENCES

Alexander, G. 1962. Temperature regulation in the new-born lamb. v. Summit metabolism. Australian Journal of Agricultural Research 13: 100–121.Google Scholar
Alexander, G. and Bell, A. W. 1975. Maximum thermogenic response to cold in relation to the proportion of brown adipose tissue and skeletal muscle in the body and to other parameters in young lambs. Biology of the Neonate 26: 182–194.Google Scholar
Dalton, D. C., Knight, T. W. and Johnson, D. L. 1980. Lamb survival in sheep breeds on New Zealand hill country. New Zealand Journal of Agricultural Research 23: 167–173.Google Scholar
Eales, F. A. and Small, J. 1981. Effects of colostrum on summit metabolic rate in Scottish Blackface lambs at five hours old. Research in Veterinary Science 30: 266–269.Google ScholarPubMed
Gilmour, A. R. 1985. REG-A generalised linear models program. Miscellaneous Bulletin, Division of Agricultural Services, Department of Agriculture, New South Wales, No. 1.Google Scholar
Hight, G. K. and Jury, K. E. 1970. Hill country sheep production. II. Lamb mortality and birth weights in Romney and Border Leicester × Romney flocks. New Zealand Journal of Agricultural Research 13: 735–752.CrossRefGoogle Scholar
Holmes, C. W. 1971. The effect of milk given at various temperatures on the oxygen consumption of young calves. Animal Production 13: 629–635.Google Scholar
McCutcheon, S. N., Holmes, C. W. and McDonald, M. F. 1981. The starvation-exposure syndrome and neonatal lamb mortality: a review. Proceedings of the New Zealand Society of Animal Production 41: 209–217.Google Scholar
McCutcheon, S. N., Holmes, C. W., McDonald, M. F. and Rae, A. L. 1983a. Resistance to cold stress in the newborn lamb. 1. Responses of Romney, Drysdale × Romney, and Merino lambs to components of the thermal environment. New Zealand Journal of Agricultural Research 26: 169–174.CrossRefGoogle Scholar
McCutcheon, S. N., Holmes, C. W., McDonald, M. F. and Rae, A. L. 1983b. Resistance to cold stress in the newborn lamb. 2. Role of body weight, birth rank, and some birth coat characters as determinants of resistance to cold stress. New Zealand Journal of Agricultural Research 26: 175–181.Google Scholar
McLean, J. A. 1972. On the calculation of heat production from open-circuit calorimetric measurements. British Journal of Nutrition 27: 597–600.CrossRefGoogle ScholarPubMed
Morand-Fehr, P. 1987. Management programs for the prevention of kid losses. In Proceedings of the Fourth International Conference on Goats (ed. Santana, O. P., Silva, A. G. da and Foote, W. C.), Departamento de Difusao de Technologia, Brasilia, Brazil, pp. 405–423.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
Slee, J. 1978. The effects of breed, birthcoat and body weight on the cold resistance of newborn lambs. Animal Production 27: 43–49.Google Scholar
Slee, J., Simpson, S. P. and Woolliams, J. A. 1987. Metabolic rate responses to cold and to exogenous noradrenaline in newborn Scottish Blackface lambs genetically selected for high or low resistance to cold. Animal Production 45: 69–74.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
Westhuysen, J. M.Van der wentzel, D. and Grobler, M. C. 1985. Angora Goats and Mohair in South Africa. NKB Printers, Port Elizabeth, South Africa.Google Scholar