Hostname: page-component-745bb68f8f-hvd4g Total loading time: 0 Render date: 2025-01-07T11:09:44.911Z Has data issue: false hasContentIssue false
  • English
  • Français

Amino acid requirements of growing pigs. 1. Effects of reducing protein level in diets containing high levels of lysine

Published online by Cambridge University Press:  02 September 2010

A. J. Taylor ,
D. J. A. Cole  and
D. Lewis
A. J. Taylor
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leicestershire LE12 5RD
D. J. A. Cole
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leicestershire LE12 5RD
D. Lewis
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leicestershire LE12 5RD
Get access

Abstract

Sixty-four growing pigs, with equal numbers of females and castrated males, were fed diets containing from 10 to 17·6% crude protein but in which lysine was maintained at 0·95%. Over the 25 kg to 55 kg live-weight range studied, growth performance was unaffected by a reduction in crude protein level from 17·6 to 14·5%. Below 14·5% crude protein, daily live-weight gain and feed conversion ratio deteriorated linearly. Percentages of lean meat and fat in the middle joint showed similar trends. Significant sex effects were confined to carcass characteristics which indicated that the females produced leaner carcasses. It was concluded that below 14·5% crude protein a deficiency of the next limiting amino acid to lysine, or possibly non-essential nitrogen, depressed growth performance.

Type
Research Article
Information
Animal Production , Volume 29 , Issue 3 , December 1979 , pp. 327 - 338
Copyright
Copyright © British Society of Animal Science 1979

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Adam, J. L. and Smith, W. C. 1966. The use of sample joints in predicting the composition of the pig carcass. Anim. Prod. 8: 85–94.Google Scholar
Agricultural Research Council. 1967. The Nutrient Requirements of Farm Livestock. No. 3, Pigs. Agricultural Research Council, London.Google Scholar
Back, H. L., Buttery, P. J. and Gregson, K. 1972. A new method for the computation of amino acid chromatograms. Chromat. 68: 103–109.Google ScholarPubMed
Blair, R., Dent, J. B., English, P. R. and Raeburn, J. R. 1969a. Protein, lysine and feed intake level effects on pig growth. I. Main effects. J. agric. Sci., Comb. 72: 379–400.CrossRefGoogle Scholar
Blair, R., Dent, J. B., English, P. R. and Raeburn, J. R. 1969b. Protein, lysine and feed intake level effects on pig growth. II. Effects on carcass composition and quality. J. agric. Sci., Camb. 73: 395–415.CrossRefGoogle Scholar
Buttery, P. J. and Soar, J. B. 1975. A spectrofluorimetric assay of the tryptophan content of feedstuffs. J. Sci. Fd Agric, 26: 1273–1277.CrossRefGoogle Scholar
Cooke, R. 1969. Protein nutrition of the growing pig. Ph.D. Thesis, Univ. Nottingham.Google Scholar
Crehan, M. P., Lewis, D. and Lodge, G. A. 1966. The response of the growing pig to dietary lysine level. Anim. Prod. 8: 362 (Abstr.).Google Scholar
Cuthbertson, A., and Pease, A. H. R. 1965. Interrelations of various measurements and dissection results of pigs of 200 lb. live-weight. Anim. Prod. 7: 284 (Abstr.).Google Scholar
Denckla, W. D. and Dewey, H. K. 1967. The determination of tryptophan in plasma, liver and urine. J. Lab. din. Med. 69: 160–169.Google ScholarPubMed
Fisher, C, Morris, T. R. and Jennings, R. C. 1973. A model for the description and prediction of the response of laying hens to amino acid intake. Br. Poult. Sci. 14:469–484.CrossRefGoogle Scholar
Harrington, G. 1966. The relative accuracy and cost of alternative methods of pig carcass evaluation. Z. Tierzucht ZüchtBiol. 82: 187–198.CrossRefGoogle Scholar
Henry, Y., Rérat, A. and Tomassone, R. 1971. [Lysine requirement of the growing-finishing pig. Application of the mulivariate statistical analysis.] 521–550.CrossRefGoogle Scholar
Joblin, A. D. H. 1966. The estimation of carcass composition in bacon-weight pigs. III. The use of butcher's dissections and full dissections of sample joints. N.Z. Jl agric. Res. 9: 241–251.CrossRefGoogle Scholar
Lodge, G. A., Hardy, B. and Lewis, D. 1972. Influence of energy and protein concentration in the diet on the performance of growing pigs. 4. Effects of sex on response to dietary protein level. Anim. Prod. 14: 229–239.Google Scholar
Snedecor, G. W. 1956. Statistical Methods, 5th ed. Iowa State University Press, Ames, la.Google Scholar
Spencer, R. L. and Wold, F. 1969. A new convenient method for estimation of total cystine-cysteine in proteins. Analyt. Biochem. 32: 185–190.CrossRefGoogle ScholarPubMed