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Environmental modifications in a pig growth model for early-weaned piglets

Published online by Cambridge University Press:  02 September 2010

L. D. Jacobson ,
S. G. Cornelius  and
K. A. Jordan
L. D. Jacobson
Affiliation:
Department of Agricultural Engineering, University of Minnesota, St Paul 55108, USA
S. G. Cornelius
Affiliation:
Department of Animal Science, University of Minnesota, St Paul 55108, USA
K. A. Jordan
Affiliation:
Department of Agricultural Engineering, University of Arizona, Tucson 85271, USA
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Abstract

A food-driven pig growth model was developed from two existing mathematical models. The new model predicts daily growth and heat production of early-weaned pigs. An existing pig growth model was altered by replacing the environmental component with a heat transfer model. The heat transfer model was further refined by partitioning latent heat loss between the skin and lungs, adding a thermal resistance for hair coat, and increasing tissue thermal resistance. Results from this combined model were compared with experimental observations of daily piglet growth and heat production at 15°C, 20°C, 25°C and 30°C. Good agreement existed between observed data and model predictions for piglet growth. Heat production predictions did not compare as well with experimental observations as did growth, especially when piglets lost weight.

Type
Papers
Information
Animal Production , Volume 48 , Issue 3 , June 1989 , pp. 591 - 599
Copyright
Copyright © British Society of Animal Science 1989

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References

REFERENCES

Beckett, F. E. 1965. Effective temperature for evaluating or designing hog environments. Transactions of the American Society of Agricultural Engineers 8: 163–166.CrossRefGoogle Scholar
Blaxter, K. L. 1967. The Energy Metabolism of Ruminants. Revised edition, Hutchinson, London.Google Scholar
Bond, T. E., Kelly, C. F. and Heitman, H. Jr 1952. Heat and moisture loss from swine. Agricultural Engineering 33: 148–152.Google Scholar
Bruce, J. M. and Clark, J. J. 1979. Models of heat production and critical temperature for growing pigs. Animal Production 28: 353–369.Google Scholar
Close, W. H., Mount, L. E. and Start, I. B. 1971. The influence of environmental temperature and plane of nutrition on heat losses from groups of growing pigs. Animal Production 13: 285–294.Google Scholar
Curtis, S. E. 1983. Environmental Management in Animal Agriculture, p. 39. Iowa State University Press, Ames, la.Google Scholar
Hovell, F. D. deb., Gordon, J. G. and MacPherson, R. M. 1977. Thin sows. 2. Observations on the energy and nitrogen exchanges of thin and normal sows in environmental temperatures of 20 and 5°C. Journal of Agricultural Science, Cambridge 89: 523–533.CrossRefGoogle Scholar
Ingram, D. L. 1964. The effect of environmental temperature on heat loss and thermal insulation in the young pig. Research in Veterinary Science 5: 357–364.Google Scholar
Irving, L., Peyton, L. J. and Monson, M. 1956. Metabolism and insulation of swine as bare-skinned mammals. Journal of Applied Physiology 9: 421–426.CrossRefGoogle ScholarPubMed
Jacobson, L. D. 1983. Validation of a swine growth model for early-weaned pigs. Ph.D. Thesis, University of Minnesota.Google Scholar
Jacobson, L. D., Cornelius, S. G., Jordan, K. A. 1984. Performance of early weaned piglets as a function of temperature. American Society of Agricultural Engineers, Paper No. 84–4019. St. Joseph. Michigan.Google Scholar
McArthur, A. J. 1982. The direct effects of climate on livestock. Proceedings of the 2nd International Livestock Environment Symposium, pp. 311–317. American Society of Agricultural Engineers, St. Joseph. Michigan.Google Scholar
Morrison, S. R., Bond, T. E. and Heitman, H. 1966. Skin and lung moisture loss from swine. American Society of Agricultural Engineers, Paper No. 66–441. St. Joseph, Michigan.Google Scholar
Mount, L. E. 1968. The Climatic Physiology of the Pig. Edward Arnold, London.Google Scholar
Snedecor, G. W. and Cochran, W. G. 1967. Statistical Methods, p. 236. Iowa State University Press, Ames, la.Google Scholar
Stombaugh, D. P., Roller, W. L., Adams, T. and Teague, H. S. 1973. Temperature regulation in neonatal piglets during mild cold and severe heat stress. American Journal of Physiology 225: 1192–1198.CrossRefGoogle ScholarPubMed
Stombaugh, D. P. and Roller, W. L. 1977. Temperature regulation in young pigs during mild cold and severe heat stress. Transactions of the American Society of Agricultural Engineers 20: 1110–1118.Google Scholar
Tregear, R. T. 1965. Hair density, wind speed, and heat loss in mammals. Journal of Applied Physiology 20: 796–801.CrossRefGoogle ScholarPubMed
Whittemore, C. T. 1976. A study of growth responses to nutrient inputs by modelling. Proceedings of the Nutrition Society 35: 383–391.CrossRefGoogle ScholarPubMed
Whittemore, C. T. and Fawcett, R. H. 1974. Model responses of the growing pig to the dietary intake of energy and protein. Animal Production 19: 221–231.Google Scholar
Whittemore, C. T. and Fawcett, R. H. 1975. Use of a model to estimate nutrient allowance for growing pigs. Proceedings of British Society of Animal Production, New Series 4: 116–117.Google Scholar
Whittemore, C. T. and Fawcett, R. H. 1976. Theoretical aspects of a flexible model to simulate protein and lipid growth in pigs. Animal Production 22: 87–96.Google Scholar