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Amino acid requirements of growing pigs 4. Methionine plus cystine

Published online by Cambridge University Press:  02 September 2010

S. J. Taylor ,
D. J. A. Cole  and
D. Lewis
S. 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
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Abstract

The response of the growing female pig (25 to 55 kg live weight) to increasing dietary methionine plus cystine concentrations was assessed by measurement of growth rate, food utilization, ham dissection and changes in blood metabolite concentrations. A range of 13 methionine plus cystine concentrations from 3·5 to 5·79 g/kg resulting from combinations of three basal diets and synthetic methionine, was studied. The diets were formulated using barley, a yeast protein, tapioca and synthetic amino acids to contain similar energy concentrations, 9·5 g lysine per kg diet, and adequate concentrations of other essential amino acids and non-essential nitrogen. They were offered once daily according to a restricted feeding scale.

Responses were interpreted by broken line functions which indicated, from the growth performance experiment, a requirement between 4·5 and 4·8 g/kg of the diet, when the complete range of methionine plus cystine concentrations was studied. The influence of a range of dietary methionine plus cystine concentrations from 4·1 to 5·3 g/kg diet on changes in plasma urea, methionine, lysine and threonine concentrations indicated a requirement for methionine plus cystine of 4·5 g/kg of the diet.

Type
Research Article
Information
Animal Production , Volume 37 , Issue 2 , October 1983 , pp. 265 - 274
Copyright
Copyright © British Society of Animal Science 1983

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References

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