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Methionine-hydroxy analogue was found to be significantly less bioavailable compared to dl-methionine for protein deposition in growing pigs

Published online by Cambridge University Press:  18 September 2009

A. K. Shoveller ,
S. Moehn ,
M. Rademacher ,
J. K. Htoo  and
R. O. Ball
A. K. Shoveller
Affiliation:
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5
S. Moehn
Affiliation:
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5
M. Rademacher
Affiliation:
Evonik Degussa GmbH, 63457 Hanau, Germany
J. K. Htoo
Affiliation:
Evonik Degussa GmbH, 63457 Hanau, Germany
R. O. Ball*
Affiliation:
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5
*
†E-mail: [email protected]
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Abstract

When methionine (Met) is limiting in swine diets, it is commonly supplemented by using anhydrous dl-methionine (DLM, 99% purity) or liquid dl-methionine-hydroxy analogue free acid (MHA-FA, 88% purity). The objective of this experiment was to test the null hypothesis that the bioavailability of DLM and MHA-FA were not different for growing pigs, using the indicator amino acid (AA) (phenylalanine, Phe) oxidation (IAAO) method in a slope-ratio assay. Six barrows (mean BW during study: 21.1 kg) received seven dietary treatments with all pigs receiving all diets in random order at an intake of 95 g/kg BW0.75. The basal diet (BD) contained analyzed content of 15.1% CP, 0.20% Met, 0.73% Phe and all other AA in excess of requirement. The BD was supplemented with three graded levels of DLM or MHA-FA on an equimolar basis. Dietary treatments only varied in Met content and included: (i) BD, (ii) BD + 0.034% DLM, (iii) BD + 0.054% DLM, (iv) BD + 0.086% DLM, (v) BD + 0.029% MHA-FA, (vi) BD + 0.078% MHA-FA and (vii) BD + 0.107% MHA-FA, as analyzed. Indicator AA oxidation was determined during 4 h studies, where pigs were fed half-hourly meals each equal to 1/32 of their daily feed allowance. Each meal was mixed with 258.7 kBq (s.e. 2.6) of l-[1-14C]Phe with a prime of 3.5 times the half-hourly dose added to the first meal. The slope of the decrease in IAAO calculated by linear regression analysis was greater (P = 0.012) for DLM supplementation (9.87 ± 1.450 per g, 1.488 ± 0.215% per mmol) than for MHA-FA (6.48 ± 0.89 per g, 1.107 ± 0.152% per mmol). The ratio of slopes indicated a bioavailability of MHA-FA on a product basis, relative to DLM, of 65.7%. Bioavailability on an equimolar Met basis, calculated from the ratio of the slopes was 74.4% for MHA-FA, relative to DLM. In conclusion, these results indicate that the metabolic bioavailability of MHA-FA for growing pigs is appreciably lower than that of DLM on both an equimolar and a product basis.

Keywords

bioavailabilityindicator oxidationmethioninemethionine-hydroxy analoguepig
Type
Full Paper
Information
animal , Volume 4 , Issue 1 , January 2010 , pp. 61 - 66
Copyright
Copyright © The Animal Consortium 2009

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