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Utilization of ileal digestible amino acids by pigs: Lysine

Published online by Cambridge University Press:  09 March 2007

E. S. Batterham ,
L. M. Andersen ,
D. R. Baigent ,
S. A. Beech  and
R. Elliott
E. S. Batterham
Affiliation:
NSW Agriculture & Fisheries, North Coast Agricultural Institute, Wollongbar, New South Wales 2480, Australia
L. M. Andersen
Affiliation:
NSW Agriculture & Fisheries, North Coast Agricultural Institute, Wollongbar, New South Wales 2480, Australia
D. R. Baigent
Affiliation:
NSW Agriculture & Fisheries, North Coast Agricultural Institute, Wollongbar, New South Wales 2480, Australia
S. A. Beech
Affiliation:
NSW Agriculture & Fisheries, North Coast Agricultural Institute, Wollongbar, New South Wales 2480, Australia
R. Elliott
Affiliation:
Department of Agriculture, University of Queensland, St Lucia, Queensland 4067, Australia
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Abstract

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Two experiments were conducted to determine the utilization of ileal digestible lysine by pigs. In the first, the apparent ileal digestibility of amino acids in cottonseed meal, meat-and-bone meal and soya-bean meal was determined in pigs fitted with‘T'-shaped cannulas. In the second experiment, three lysine-deficient diets were formulated to 0.36 g ileal digestible lysine/MJ digestible energy (DE), with lysine contributed from the three protein concentrates as the only source of lysine in sugar-based diets. An additional three diets were formulated with supplements of lysine to verify that lysine was limiting in the first three diets. The growth performance and retention of lysine by pigs given the six diets over the 20–45 kg growth phase were then determined. The apparent ileal digestibility of lysine in the three protein concentrates (proportion of total) was: cottonseed meal 0.74, meat-and-bone meal 0.78, soya-bean meal 0.89. Growth rates (g/d) of the pigs given the three diets formulated to 0.36 g ileal digestible lysine/MJ DE were significantly different (P < 0.001): cottonseed meal 377, meat-and-bone meal 492, soya-bean meal 541. The response of pigs to the addition of lysine confirmed that lysine was limiting in these diets. Crude protein (nitrogen× 6.25) deposited by the pigs was significantly higher (P < 0.001) for those given soya-bean meal (77 g/d), relative to meat-and-bone meal (66 g/d) and cottonseed meal (38 g/d). The proportion of ileal digestible lysine retained by pigs given the three protein concentrates was: cottonseed meal 0.36, meat-and-bone meal 0.60, soya-bean meal 0.75. The results indicate that values for the ileal digestibility of lysine in protein concentrates are unsuitable in dietary formulations as the assay does not reflect the proportion of lysine that can be utilized by the pig. It appears that, with heat-processed meals, a considerable proportion of the lysine is absorbed in a form(s) that is (are) inefficiently utilized.

Keywords

Ileal digestibilityLysine utilizationProtein concentratesPigs
Type
Amino Acid Availability
Information
British Journal of Nutrition , Volume 64 , Issue 3 , November 1990 , pp. 679 - 690
Copyright
Copyright © The Nutrition Society 1990

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