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Amino acid requirements of growing pigs 5. The interaction between isoleucine and leucine

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

Thirty-two female growing pigs (25 to 55 kg live weight) were subjected to four dietary treatments combining two levels of isoleucine and two levels of leucine to investigate the effects of leucine supply on the requirement for isoleucine.

Results for daily live-weight gain, food conversion efficiency and carcass quality judged by ham dissection indicated that 3·8 g isoleucine per kg diet was marginally adequate for the growing pig in diets containing 13·4 g leucine per kg. An interaction between dietary leucine and isoleucine was demonstrated. Increasing the dietary leucine concentration to 20·4 g/kg clearly resulted in a deficiency of isoleucine in the basal diet, as daily gain, food conversion efficiency and carcass quality were significantly improved by increasing the isoleucine concentration from 3·8 g to 4·5 g/kg diet. Dietary leucine concentration did not influence performance at the higher level of isoleucine supply. Changes in plasma urea and amino acid concentrations confirmed the findings from the growth experiment of the interaction between isoleucine, leucine and valine.

Type
Research Article
Information
Animal Production , Volume 38 , Issue 2 , April 1984 , pp. 257 - 261
Copyright
Copyright © British Society of Animal Science 1984

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References

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