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Value of ADIN as a measure of unavailable nitrogen in treated rapeseed meal

Published online by Cambridge University Press:  20 November 2017

A. R. Moss ,
J. A. Metcalf  and
D.I. Givens
A. R. Moss
Affiliation:
ADAS Nutritional Sciences Research Unit, Alcester Road, Stratford upon-Avon, CV37 9RQ, UK
J. A. Metcalf
Affiliation:
Borregaard UK Limited, Clayton Road, Birchwood, Warrington, WA3 6QQ, UK
D.I. Givens
Affiliation:
ADAS Nutritional Sciences Research Unit, Alcester Road, Stratford upon-Avon, CV37 9RQ, UK
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Extract

Acid detergent insoluble nitrogen (ADIN) is used in the UK Metabolisable Protein system (AFRC, 1992) to estimate the amount of indigestible nitrogen (N) in a feedstuff. A novel process has been developed which is intended to increase the proportion of undegradable protein in rapeseed meal. In situ work on this treated rapeseed product (TRSM) has shown a reduced rate of rumen degradation compared with the untreated product (UTRSM). However when these data were used in combination with ADIN content to calculate digestible undegraded protein (DUP), there was a minimal increase in DUP due to the high content of ADIN in the TRSM. There have been other cases where products have high ADIN content (e.g. distillery by-products; Webster, 1992) but when whole tract determinations of indigestible N were made, this was considerably lower than estimated from ADIN content. This raises some concerns about the use of ADIN to estimate indigestible protein for by- and treated- products. The objective of this study was to investigate whether the ADIN content of the untreated and treated rapeseed products was representative of the indigestible N.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2000 , 2000 , pp. 47
Copyright
Copyright © The British Society of Animal Science 2000

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References

AFRC, 1992. AFRC TCORN Report No. 9. Nutritive Requirements of Ruminant Animals: Protein. Nutrition Abstracts and Reviews (Series B) 62: (No. 12).Google Scholar
Webster, A. J. F., 1992. The metabolizable protein system for ruminants. In: Garnsworthy, P. C., Haresign, W. and Cole, D. J. A. (eds) Recent Advances in Animal Nutrition, pp 93–140 London: Butterworths CrossRefGoogle Scholar