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The digestion and utilization of amino acids of heat-treated fish meal by growing/finishing pigs

Published online by Cambridge University Press:  02 September 2010

J. Wiseman ,
S. Jagger ,
D. J. A. Cole  and
W. Haresign
J. Wiseman
Affiliation:
University of Nottingham, Faculty of Agricultural and Food Sciences, Sutton Bonington, Loughborough LE12 5RD
S. Jagger
Affiliation:
University of Nottingham, Faculty of Agricultural and Food Sciences, Sutton Bonington, Loughborough LE12 5RD
D. J. A. Cole
Affiliation:
University of Nottingham, Faculty of Agricultural and Food Sciences, Sutton Bonington, Loughborough LE12 5RD
W. Haresign
Affiliation:
University of Nottingham, Faculty of Agricultural and Food Sciences, Sutton Bonington, Loughborough LE12 5RD
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Abstract

A batch offish meal was (a) untreated, (b) heated to 130°C and (c) heated to 160°C under controlled conditions.

In trial 1, these materials were incorporated into a diet based on barley meal (278·7 g/kg), wheat starch (412·5 g/kg), maize meal (245·3 g/kg) and tallow (33·5 g/kg) at a rate of inclusion of 100 g/kg. Diets contained a vitamin/mineral pre-mix together with the inert marker titanium dioxide and were given to four pigs fitted with simple T-piece Heal cannulas over four time periods each of which lasted for 6 days and which allowed the determination of faecal and Heal apparent digestibilities of nitrogen and amino acids. The results indicated that over-heating fish meal results in a reduction in both Heal and faecal apparent digestibility although, as there was no effect of treatment on the quantity of nitrogen absorbed from the large intestine, the two measurements were directly related. Heal and faecal apparent digestibilities for individual amino acids were not the same as data for nitrogen and, accordingly, the latter cannot be used to predict the two former.

In trial 2, the three fish meal samples were included in diets formulated on the basis of total, faecal and Heal apparent digestible amino acids. The nine diets were given to pigs over the live-weight range 27·5 to 52·5 kg. Giving diets formulated on the basis of both faecal and Heal apparent digestible amino acids resulted in improved performance compared with giving diets based on total amino acids when the diets containing fish meal heated to 160°C, but performance achieved with diets containing untreated fish meal was still higher.

Heal apparent digestible amino acids from heat-treated fish meal are not completely available to the pig, and it is suggested that care needs to be taken in equating digestibility with subsequent availability. There appears to be no advantage of using Heal rather than faecal, apparent digestible amino acid values in texms of accuracy of diet formulation.

Keywords

amino acidsdigestibilityfish mealheat processingpigs
Type
Research Article
Information
Animal Production , Volume 53 , Issue 2 , October 1991 , pp. 215 - 225
Copyright
Copyright © British Society of Animal Science 1991

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