Poster (Scientific congresses and symposiums)
Phenotypic and genetic variability of methane emissions and milk fatty acid contents of Walloon Holstein dairy cows
Vanrobays, Marie-Laure; Kandel, Purna Bhadra; Soyeurt, Hélène et al.
201319th National Symposium on Applied Biological Sciences
 

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Keywords :
methane emissions; fatty acids; milk
Abstract :
[en] There is a growing interest in reducing methane (CH4) emissions from enteric fermentation of dairy cows because these emissions contribute to climate change and represent losses of gross energy intake for cows. Milk fatty acid (FA) profile is influenced by rumen fermentations. The aim of this study was to estimate phenotypic and genetic variability of enteric CH4 emissions of dairy cows and FA contents of milk. CH4 emissions (g/d) and milk FA contents are predicted from milk mid-infrared (MIR) spectra based on calibration equations developed by Vanlierde et al. (2013) and Soyeurt et al. (2011), respectively. Data included 161,681 records from 22,642 cows in 489 herds. Genetic parameters of MIR CH4 emissions and 7 groups of FA contents in milk were estimated for Walloon Holstein cows in first parity using bivariate (CH4 emission with a FA trait) random regression test-day models. Saturated FA presented higher genetic correlations with MIR CH4 production than unsaturated FA (0.25 vs. 0.10). Genetic correlations with MIR CH4 emissions were higher for short-(SC) and medium-chain (MC) FA (0.24 and 0.23, respectively) than for long-chain (LC) FA (0.13). Phenotypic correlations between MIR CH4 emissions and SC and MC FA were also higher than those between MIR CH4 emissions and LC FA (0.20 vs. -0.08). Finally, results showed that MIR milk FA profile and MIR CH4 emissions are correlated emphasizing indirect link between milk FA and CH4 emissions through rumen metabolism.
Disciplines :
Genetics & genetic processes
Animal production & animal husbandry
Agriculture & agronomy
Author, co-author :
Vanrobays, Marie-Laure ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Kandel, Purna Bhadra ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Soyeurt, Hélène  ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Vanlierde, Amélie ;  CRA-W > Dép. Valorisation des Productions Agricoles
Dehareng, Frédéric  ;  CRA-W > Dép. Valorisation des Productions Agricoles
Froidmont, Eric;  CRA-W > Dép. des productions animale
Gengler, Nicolas  ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Language :
English
Title :
Phenotypic and genetic variability of methane emissions and milk fatty acid contents of Walloon Holstein dairy cows
Alternative titles :
[fr] Variabilité phénotypique et génétique des émissions de méthane et du taux en acides gras dans le lait des vaches laitières Holstein wallonnes
Publication date :
07 February 2013
Number of pages :
A0
Event name :
19th National Symposium on Applied Biological Sciences
Event organizer :
ULg - Gembloux Agro-Bio Tech
Event place :
Gembloux, Belgium
Event date :
07 février 2013
Name of the research project :
MéthaMilk
Available on ORBi :
since 05 June 2014

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