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Effect of Lysine/DE Ratio on Growth Performance and Nitrogen Deposition of Hybrid Boars, Gilts and Castrates

Published online by Cambridge University Press:  21 November 2017

T.A. Van Lunen  and
D.J.A. Cole
T.A. Van Lunen
Affiliation:
Faculty of Agriculture and Food Science, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, LE12 5RD
D.J.A. Cole
Affiliation:
Faculty of Agriculture and Food Science, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, LE12 5RD
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Extract

With the development of pig genotypes having high N deposition rates, previously accepted nutrient requirement recommendations must be re-examined. Requirements for protein (assuming lysine represents ‘ideal’ protein) for conventional growing pigs have been in the range of .60 to .74 g lysine/MJ DE (Batterham, 1994) while recent work with hybrid boars has shown a positive growth and N deposition response to ratios of the order of 1.0 (Rao and McCracken, 1991). It is generally accepted that sex has an effect on N deposition rate (Campbell et al., 1990) and therefore possibly on nutrient requirements. There is little information available on the effect of sex on growth and N deposition rate of modern genotypes. This experiment was conducted to estimate the N deposition rate of highly selected boars, gilts and castrates from 25 to 90 kg liveweight when fed diets containing ratios from 0.4 to 1.4 g lysine/MJ DE.

Type
PIG Feeding and Nutrition
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1994 , March 1994 , pp. 32
Copyright
Copyright © The British Society of Animal Production 1994

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References

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