Fat accretion measurements strengthen the relationship between feed conversion efficiency and Nitrogen isotopic discrimination while rumen microbial genes contribute little

Meale, Sarah J., Auffret, Marc D, Watson, Mick, Morgavi, Diego P, Cantalapiedra-Hijar, Gonzalo, Duthie, Carol-Anne, Roehe, Rainer and Dewhurst, Richard J (2018) Fat accretion measurements strengthen the relationship between feed conversion efficiency and Nitrogen isotopic discrimination while rumen microbial genes contribute little. Scientific reports, 8 1: 3854. doi:10.1038/s41598-018-22103-4


Author Meale, Sarah J.
Auffret, Marc D
Watson, Mick
Morgavi, Diego P
Cantalapiedra-Hijar, Gonzalo
Duthie, Carol-Anne
Roehe, Rainer
Dewhurst, Richard J
Title Fat accretion measurements strengthen the relationship between feed conversion efficiency and Nitrogen isotopic discrimination while rumen microbial genes contribute little
Journal name Scientific reports   Check publisher's open access policy
ISSN 2045-2322
Publication date 2018-03-01
Year available 2018
Sub-type Article (original research)
DOI 10.1038/s41598-018-22103-4
Open Access Status DOI
Volume 8
Issue 1
Start page 3854
Total pages 7
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
Subject 1000 General
Abstract The use of biomarkers for feed conversion efficiency (FCE), such as Nitrogen isotopic discrimination (ΔN), facilitates easier measurement and may be useful in breeding strategies. However, we need to better understand the relationship between FCE and ΔN, particularly the effects of differences in the composition of liveweight gain and rumen N metabolism. Alongside measurements of FCE and ΔN, we estimated changes in body composition and used dietary treatments with and without nitrates, and rumen metagenomics to explore these effects. Nitrate fed steers had reduced FCE and higher ΔN in plasma compared to steers offered non-nitrate containing diets. The negative relationship between FCE and ΔN was strengthened with the inclusion of fat depth change at the 3lumbar vertebrae, but not with average daily gain. We identified 1,700 microbial genes with a relative abundance >0.01% of which, 26 were associated with ΔN. These genes explained 69% of variation in ΔN and showed clustering in two distinct functional networks. However, there was no clear relationship between their relative abundances and ΔN, suggesting that rumen microbial genes contribute little to ΔN. Conversely, we show that changes in the composition of gain (fat accretion) provide additional strength to the relationship between FCE and ΔN.
Keyword Dairy-Cows
Dietary Nitrate
N-15 Enrichment
Fractionation
Emissions
Denitrification
Hydrogen
Sheep
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 658126
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Agriculture and Food Sciences
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in Thomson Reuters Web of Science Article
Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Wed, 07 Mar 2018, 11:04:08 EST