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5.1 The ARC System for Assessing the Nitrogen Value of Feeds for Ruminants
Published online by Cambridge University Press: 27 February 2018
Extract
The system put forward by a working party of the Agricultural Research Council is fully described in a recent publication (ARC, 1980) and will be outlined only briefly here. Most attention will be given to considering the usefulness of the system, some of its limitations and probable ways of future development.
It is proposed in the scheme that a diet should be formulated in terms of metabolizable energy needed for the required performance. This energy intake largely determines the maximum amount of microbial growth possible in the rumen per day and therefore the amount of N that has to be made available to the microorganisms to achieve this growth. This is referred to as the rumen degradable nitrogen (RDN) in the diet (the crude protein equivalent (RDP) = RDN x 6.25) and its utilization forms the first in a chain of events relating the N compounds eaten with the compounds deposited in the animal's body or products. All the events in the chain are affected by a variety of factors and some of these will be discussed later but, in order to demonstrate the principle of the scheme, average values derived from the literature and given in ARC (1980) will be assigned to them.
- Type
- 5. Systems for Assessing the Nitrogen Value of Feeds for Ruminants
- Information
- BSAP Occasional Publication , Volume 6: Forage Protein in Ruminant Animal Production , 1982 , pp. 99 - 106
- Copyright
- Copyright © British Society of Animal Production 1982
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