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Lysine requirements of pigs from 2 to 7 kg live weight

Published online by Cambridge University Press:  02 September 2010

D. E. Auldist ,
F. L. Stevenson ,
M. G. Kerr ,
P. Eason  and
R. H. King
D. E. Auldist
Affiliation:
Victorian Institute of Animal Science, Private Bag 7, Sneydes Road, Werribee, Victoria 3030, Australia
F. L. Stevenson
Affiliation:
Victorian Institute of Animal Science, Private Bag 7, Sneydes Road, Werribee, Victoria 3030, Australia
M. G. Kerr
Affiliation:
Victorian Institute of Animal Science, Private Bag 7, Sneydes Road, Werribee, Victoria 3030, Australia
P. Eason
Affiliation:
Victorian Institute of Animal Science, Private Bag 7, Sneydes Road, Werribee, Victoria 3030, Australia
R. H. King
Affiliation:
Victorian Institute of Animal Science, Private Bag 7, Sneydes Road, Werribee, Victoria 3030, Australia
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Abstract

Thirty-two male pigs were used to investigate the effects of nine levels of dietary lysine ranging from 0·41 to 1·30 g lysine per MJ gross energy (GE) on the performance of pigs weaned at 1 to 2 days of age and growing between 2 and 7 kg live weight. The nine dietary lysine treatments, which contained similar levels of GE and balance of essential amino acids, were offered to the pigs at a common feeding level of 2·0 MJ GE per kg metabolic live weight (M075) per day. Growth performance and protein deposition rates increased linearly with increasing dietary lysine content up to about 0·97 g lysine per MJ GE and remained relatively constant thereafter. The response of protein deposition (PD, g/day) in the whole body of pigs to dietary lysine (L, g lysine per MJ GE) was described by three models. The respective regression equation for the quadratic function was PD = -14·23 + 87·66 L – 36·00 L2 and maximum protein deposition occurred at 1·22 g lysine per MJ GE. The rectilinear model, which had an ascending linear phase (PD = 1·49 + 40·10 L, R2 = 0·98, P < 0·001) and a horizontal component representing a mean protein deposition rate of 39·7g/day revealed that maximum protein deposition occurred at 0·95g lysine per MJ GE. Finally, application of the asymptotic model also revealed a highly significant equation: PD = 43·40 — 79·99 × 0·07111, R2 = 0·94, P < 0·001; which indicates a dietary requirement of 1·07 g lysine per MJ GE assuming that the dietary requirement was estimated at 0·90 of the asymptote maximal value. The results indicate that the dietary lysine requirement for pigs during the first 3 weeks of life appears to have changed little over the past 20 years despite substantial changes in genotype.

Keywords

lysinepigsprotein
Type
Research Article
Information
Animal Science , Volume 65 , Issue 3 , December 1997 , pp. 501 - 507
Copyright
Copyright © British Society of Animal Science 1997

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