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The effect of formaldehyde treatment of soya-bean meal and rapeseed meal on the amino acid profiles and acid-pepsin solubility of rumen undegraded protein

Published online by Cambridge University Press:  27 March 2009

T. Varvikko ,
J. E. Lindberg ,
J. Setälä  and
Liisa Syrjälä-Qvist
T. Varvikko
Affiliation:
Department of Animal Nutrition, Swedish University of Agricultural Sciences, S–750 07 Uppsala, Sweden
J. E. Lindberg
Affiliation:
Department of Animal Nutrition, Swedish University of Agricultural Sciences, S–750 07 Uppsala, Sweden
J. Setälä
Affiliation:
Department of Animal Nutrition, Swedish University of Agricultural Sciences, S–750 07 Uppsala, Sweden
Liisa Syrjälä-Qvist
Affiliation:
Department of Animal Nutrition, Swedish University of Agricultural Sciences, S–750 07 Uppsala, Sweden
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Summary

Soya-bean meal and rapeseed meal treated with 0, 0·4 or 0·8 g formaldehyde/100 g crude protein (N × 6·25) was incubated in the rumen in nylon bags with 10 and 40 μm aperture.

Disappearance of dry matter and nitrogenous compounds was reduced with increasing formaldehyde treatment.

The proportion of acid-pepsin soluble nitrogen in the undegraded residues of untreated and treated soya-bean meal was similar to the original samples. For rapeseed meal the proportion of acid-pepsin soluble nitrogen in the undegraded residues decreased with increasing rumen incubation time. This reduction decreased with increasing formaldehyde treatment.

Concentration of amino acids in the undegraded residues did not generally deviate from those in the original samples. However, a distinguishable decrease in the methionine concentration was observed in all the rapeseed meal samples and in glutamic acid concentration in rapeseed meal treated with 0 and 0·4 g formaldehyde/100g- crude protein.

Most of the changes due to rumen incubation were smaller using the 10 μm bags than using the 40 μm bags. However, the bag pore size did not play a decisive role in the conclusions of the results given.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 101 , Issue 3 , December 1983 , pp. 603 - 612
Copyright
Copyright © Cambridge University Press 1983

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