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Protein, lysine and feed intake level effects on pig growth. III. Regression analysis and economic aspects

Published online by Cambridge University Press:  27 March 2009

J. B. Dent ,
R. Blair ,
P. R. English  and
J. R. Raeburn
J. B. Dent
Affiliation:
School of Agriculture, University of Aberdeen
R. Blair
Affiliation:
School of Agriculture, University of Aberdeen
P. R. English
Affiliation:
School of Agriculture, University of Aberdeen
J. R. Raeburn
Affiliation:
School of Agriculture, University of Aberdeen
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Summary

Data from the experiment described in the first paper of this series were subjected to regression analysis. Lean meat and live-weight gain response to both lysine and crude protein intake was almost linear in period 1 but in later periods little response was evident. Response of live-weight gain to increased energy was continuous though diminishing in the later periods. In periods 1 and 2 lean gains showed positive though diminishing response to energy.

In a multivariate regression analysis it was clear especially for younger pigs that the response to dietary lysine for both live-weight and lean meat gains is influenced by the dietary level of crude protein and the energy intake. Separate multivariate analysis for each sex indicated that females are more efficient converters of lysine and energy into live weight and lean meat. Also an interaction between sex and dietary lysine level was suggested.

A methodology for an economic analysis taking the joint objectives of total cost of production, speed of grain and quality of gain is established as a basis for design of high profit system of production.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 75 , Issue 2 , October 1970 , pp. 189 - 205
Copyright
Copyright © Cambridge University Press 1970

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References

REFERENCES

Anderson, J. R. & Dillon, J. L. (1968). Economic considerations in response research. Am. J. agric. Econ. 33, 130–42.CrossRefGoogle Scholar
Blair, R., Dent, J. B., English, P. R. & Raeburn, J. R. (1969). Protein, lysine and feed intake level effects on pig growth. I. Main effects. J. agric. Sci., Camb. 72, 379–400.CrossRefGoogle Scholar
Brinegar, M. J., Williams, H. H., Ferris, F. M., Loosli, J. K. & Maynard, L. A. (1950). The lysine requirement for the growth of swine. J. Nutr. 42, 129–38.CrossRefGoogle ScholarPubMed
Clawson, A. J., Blumer, T. N., Smart, W. W. G. Jr & Barrick, M. R. (1962). Influence of energy-protein ratio on performance and carcase characteristics of swine. J. Anim. Sci. 21, 62–8.CrossRefGoogle Scholar
Dent, J. B. (1964). Optimal rations for livestock with special reference to bacon pigs. J. agric. Econ. 16, 68–87.CrossRefGoogle Scholar
Dent, J. B. & Casey, H. (1967). Linear Programming and Animal Nutrition, pp. 112. London: Crosby Lockwood Ltd.Google Scholar
Dent, J. B. & Raeburn, J. R. (1968). The use of input/output relationships in determining high profit systems of production. Anim. Prod. 11, 131 (Abstract).Google Scholar
Dent, J. B. & Thompson, S. C. (1968). The application of Monte Carlo techniques to feed mix problems. Fm Economist 11, 230–48.Google Scholar
Elsley, F. W. H. (1963). Studies of growth and development in the young pig. I. The carcass composition at 56 days of age of pigs reared along different growth curves. J. agric. Sci., Camb. 61, 233–41.CrossRefGoogle Scholar
Ezekiel, M. & Fox, K. A. (1959). Methods of Correlation and Regression Analysis, 3rd ed., pp. 548. New York: John Wiley and Sons Inc.Google Scholar
Hays, V. W., Wagner, G. R. & Clark, A. J. (1963). Effect of energy and protein levels on performance and carcase characteristics of pigs. Feedstuff's, Lond. 35 (25), 28–31.Google Scholar
Heady, E. O. & Dillon, J. L. (1961). Agricultural Production Functions, pp. 667. Ames, Iowa: Iowa State University Press.Google Scholar
Jones, A. S., Hepburn, W. R., Cadenhead, A. & Boyne, A. W. (1962). The effect of variation of protein quality and protein level in diets on the performance of young pigs. Anim. Prod. 4, 185–93.Google Scholar
Jones, A. S., Livingstone, D. M. S. & Livingstone, R. M. (1963). Effects of varying protein and lysine levels in the diets of pigs. Anim. Prod. 5, 222–3 (Abstract).Google Scholar
Jurgens, M. H., Hudman, D. B., Adams, C. H. & Peo, E. R. Jr (1967). Influence of a dietary supplement of lysine fed at two levels of protein on growth, feed efficiency and carcase characteristics of swine. J. Anim. Sci. 26, 323–7.CrossRefGoogle Scholar
Merret, A. J. & Sykes, A. (1966). The Finance and Analysis of Capital Projects, pp. 544. London: Longmans.Google Scholar
Mitchell, J. R. Jr, Becker, D. E., Jenson, A. H., Morton, H. W. & Harmon, G. B. (1965). Lysine need of swine at two stages of development. J. Anim. Sci. 24, 409–12.CrossRefGoogle ScholarPubMed
Pieterze, P. J. S. & Penzhorn, E. J. (1960). The effect of feeding different levels of protein to baconers. S. Afr. J. agric. Sci. 3, 573–80.Google Scholar
Pieterze, P. J. S. & Verbeek, W. A. (1959). The influence of feeding different levels of protein to porkers. S. Afr. J. agric. Sci. 2, 343–55.Google Scholar
Robinson, D. W. (1962). Ph.D. Thesis, University of Nottingham.Google Scholar
Robinson, D. W., Morgan, J. T. & Lewis, D. (1964). Protein and energy nutrition of the bacon pig. I. The effect of varying protein and energy levels in the diet of growing pigs. J. agric. Sci., Camb. 62, 369–76.CrossRefGoogle Scholar
Robinson, D. W. & Lewis, D. (1964). Protein and energy nutrition of the bacon pig. II. The effect of varying the protein and energy levels in the diets of finishing pigs. J. agric. Sci., Camb. 63, 185–90.CrossRefGoogle Scholar
Schwartz, H. G., Taylor, M. W. & Fisher, H. (1958). The effect of dietary energy concentration and age on the lysine requirement of the growing chick. J. Nutr. 65, 25–37.CrossRefGoogle Scholar
Sibald, I. R., Bowland, J. P., Roblee, A. R. & Berg, R. T. (1957). Apparent digestible energy and nitrogen in food of the weanling rat. Influence on food consumption nitrogen retention and carcase composition. J. Nutr. 61, 71–85.CrossRefGoogle Scholar
Standish, J. F. & Bowland, J. P. (1967). Effects of varying dietary energy, protein and amino acid levels on growth, nutrient, digestibility and serum protein levels of early weaned pigs. Can. J. Anim. Sci. 47, 77–84.CrossRefGoogle Scholar
Townsley, R. (1968). Derivation of optimal livestock rations using quadratic programming. J. agric. Econ. 19, 347–54.CrossRefGoogle Scholar
Wagner, G. R., Clark, A. J., Hays, V. W. & Speer, V. S. (1963). Effect of protein energy relationships on the performance and carcase quality of growing swine. J. Anim. Sci. 22, 202–8.CrossRefGoogle Scholar