Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/2703
Title: Biological basis for variation in residual feed intake in beef cattle 1: Review of potential mechanisms
Contributor(s): Herd, Robert M  (author)orcid ; Oddy, Hutton  (author)orcid ; Richardson, E C (author)
Publication Date: 2004
DOI: 10.1071/EA02220
Handle Link: https://hdl.handle.net/1959.11/2703
Abstract: There is a growing body of evidence that there is genetic variation in beef cattle feed intake relative to their liveweight and weight gain. Difference in feed intake, above and below that expected or predicted on the basis of size and growth, is measured as residual feed intake. Variation in residual feed intake must be underpinned by measurable differences in biological processes. This paper summarises some plausible mechanisms by which variation in efficiency of nutrient use may occur and presents several testable hypotheses for such variation. A companion paper [Richardson and Herd (2004) Aust. J. Exp. Ag. 44, 431–441] presents results from experiments on cattle following divergent selection for residual feed intake. There were at least 5 major processes identified by which variation in efficiency can arise. These are associated with variation in intake of feed, digestion of feed, metabolism (anabolism and catabolism associated with and including variation in body composition), activity and thermoregulation. The percentage contribution of different mechanisms, to variation in residual feed intake, was: 9% for differences in heat increment of feeding; 14% for differences in digestion; 5% for differences in body composition; and 5% for differences in activity. Together, these mechanisms may be responsible for about one-third of the variation in residual feed intake. The remaining two-thirds were likely to be associated with heat loss due to variation in other processes, such as protein turnover and ion transport. There is no shortage of candidate mechanisms that, singularly or in combination, might contribute to genetic variation in energy utilisation in ruminants. Further research in beef cattle, to better define these mechanisms and enable their incorporation into breeding programmes, may lead not only to cattle which eat less for the same performance, but are superior in other traits as well.
Publication Type: Journal Article
Source of Publication: Australian Journal of Experimental Agriculture, 44(4/5), p. 423-430
Publisher: CSIRO Publishing
Place of Publication: Melbourne, Australia
ISSN: 0816-1089
Field of Research (FOR): 070202 Animal Growth and Development
Socio-Economic Outcome Codes: 830301 Beef Cattle
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Other Links: http://nla.gov.au/anbd.bib-an4599774
Statistics to Oct 2018: Visitors: 207
Views: 213
Downloads: 1
Appears in Collections:Journal Article

Files in This Item:
2 files
File Description SizeFormat 
Show full item record

Page view(s)

64
checked on Mar 3, 2019
Google Media

Google ScholarTM

Check

Altmetric


Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.