P. Veysset, M. Lherm, M. Roulenc, C. Troquier, and D. Bébin, Productivity and technical efficiency of suckler beef production systems: Trends for the period, Animal, vol.9, pp.2050-2059, 1990.

J. B. Dollé, J. Agabriel, J. L. Peyraud, P. Faverdin, V. Manneville et al., Les gaz à effet de serre en élevage bovin: Évaluation et leviers d'action, INRA Prod. Anim, vol.24, pp.415-432, 2011.

A. Gac, V. Manneville, C. Raison, T. Charroin, and M. Ferrand, L'empreinte carbone des élevages d'herbivores: Présentation de la méthodologie d'évaluation appliquée à des élevages spécialisés lait et viande, Renc. Rech. Rum, vol.17, pp.335-342, 2010.

D. P. Berry and J. J. Crowley, Cell biology symposium: Genetics of feed efficiency in dairy and beef cattle, J. Anim. Sci, vol.91, pp.1594-1613, 2013.

K. A. Donoghue, T. Bird-gardiner, P. F. Arthur, R. M. Herd, and R. F. Hegarty, Genetic and phenotypic variance and covariance components for methane emission and postweaning traits in Angus cattle, J. Anim. Sci, vol.94, pp.1438-1445, 2016.

C. S. Pinares-patiño, S. M. Hickey, E. A. Young, K. G. Dodds, S. Maclean et al., Heritability estimates of methane emissions from sheep, Animal, vol.7, pp.316-321, 2013.

J. D. Nkrumah, E. K. Okine, G. W. Mathison, K. Schmid, C. Li et al., Relationships of feedlot feed efficiency, performance, and feeding behavior with metabolic rate, methane production, and energy partitioning in beef cattle, J. Anim. Sci, vol.84, pp.145-153, 2006.

R. S. Hegarty, J. P. Goopy, R. M. Herd, and B. Mccorkell, Cattle selected for lower residual feed intake have reduced daily methane production, J. Anim. Sci, vol.85, pp.1479-1486, 2007.

G. C. Waghorn and R. S. Hegarty, Lowering ruminant methane emissions through improved feed conversion efficiency, Anim. Feed Sci. Technol, pp.291-301, 2011.

J. A. Basarab, K. A. Beauchemin, V. S. Baron, K. H. Ominski, L. L. Guan et al., Reducing GHG emissions through genetic improvement for feed efficiency: Effects on economically important traits and enteric methane production, Animal, vol.7, pp.303-315, 2013.

F. M. Jones, F. A. Phillips, T. Naylor, and N. B. Mercer, Methane emissions from grazing Angus beef cows selected for divergent residual feed intake, Anim. Feed Sci. Technol, pp.302-307, 2011.

C. Fitzsimons, D. A. Kenny, M. H. Deighton, A. G. Fahey, and M. Mcgee, Methane emissions, body composition, and rumen fermentation traits of beef heifers differing in residual feed intake, J. Anim. Sci, vol.91, pp.5789-5800, 2013.

M. E. Mercadante, A. P. Caliman, R. C. Canesin, S. F. Bonilha, A. Berndt et al., Relationship between residual feed intake and enteric methane emission in Nellore cattle, Rev. Bras. Zootec, vol.44, pp.255-262, 2015.

R. M. Herd, J. I. Velazco, P. F. Arthur, and R. F. Hegarty, Associations among methane emission traits measured in the feedlot and in respiration chambers in Angus cattle bred to vary in feed efficiency, J. Anim. Sci, vol.94, pp.4882-4891, 2016.

R. P. Mcdonnell, K. J. Hart, T. M. Boland, A. K. Kelly, M. Mcgee et al., Effect of divergence in phenotypic residual feed intake on methane emissions, ruminal fermentation, and apparent whole-tract digestibility of beef heifers across three contrasting diets, J. Anim. Sci, vol.94, pp.1179-1193, 2016.

A. W. Alemu, D. Vyas, G. Manafiazar, J. A. Basarab, and K. A. Beauchemin, Enteric methane emission from lowand high-residual feed intake beef heifers measured using GreenFeed and respiration chamber techniques, J. Anim. Sci, vol.95, pp.3727-3737, 2017.

L. F. Oliveira, A. C. Ruggieri, R. H. Branco, O. L. Cota, R. C. Canesin et al., Feed efficiency and enteric methane production of Nellore cattle in the feedlot and on pasture, Anim. Prod. Sci, vol.58, pp.886-893, 2018.

R. M. Herd, J. I. Velazco, P. F. Arthur, and R. S. Hegarty, Proxies to adjust methane production rate of beef cattle when the quantity of feed consumed is unknown, Anim. Prod. Sci, vol.56, pp.231-237, 2016.

V. Decruyenaere, P. Lecomte, C. Demarquilly, J. Aufrere, P. Dardenne et al., Evaluation of green forage intake and digestibility in ruminants using near infrared reflectance spectroscopy (NIRS): Developing a global calibration, Anim. Feed Sci. Technol, vol.148, pp.138-156, 2009.

V. Decruyenaere, M. Boval, S. Giger-reverdin, J. A. Fernández-pierna, and P. Dardenne, Faecal near infrared spectroscopy to assess diet quality in tropical and temperate grassland, Book of Abstracts 64th Annual Meeting of the European Federation of Animal Science, p.167, 2013.
URL : https://hal.archives-ouvertes.fr/hal-01594907

, User's Guide, SAS Institute Inc. SAS/STAT 15.1, p.27, 2018.

R. M. Koch, L. A. Swiger, D. Chambers, and K. E. Gregory, Efficiency of feed use in beef cattle, J. Anim. Sci, vol.22, pp.486-494, 1963.

M. Arbre, Y. Rochette, J. Guyader, C. Lascoux, L. M. Gomez et al., Repeatability of enteric methane determinations from cattle using either the SF6 tracer technique or the GreenFeed system, Anim. Prod. Sci, vol.56, pp.238-243, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01281835

G. Renand and D. Maupetit, Assessing individual differences in enteric methane emission among beef heifers using the GreenFeed Emission Monitoring system: Effect of the length of testing period on precision, Anim. Prod. Sci, vol.56, pp.218-223, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01533865

P. A. Arthur, I. M. Barchia, C. Weber, T. Bird-gardiner, K. A. Donoghue et al., Optimizing test procedures for estimating daily methane and carbon dioxide emissions in cattle using short-term breath measures, J. Anim. Sci, vol.95, pp.645-656, 2017.

G. Manafiazar, S. Zimmermann, and J. A. Basarab, Repeatability and variability of short-term spot measurement of methane and carbon dioxide emissions from beef cattle using GreenFeed emissions monitoring system. Can, J. Anim. Sci, vol.97, pp.118-126, 2017.

S. Taussat, R. Saintilan, D. Krauss, D. Maupetit, M. N. Fouilloux et al., Relationship between feed efficiency and slaughter traits of French Charolais bulls, J. Anim. Sci, vol.97, pp.2308-2319, 2019.
URL : https://hal.archives-ouvertes.fr/hal-02619951

A. B. Pereira, S. A. Utsumi, C. D. Doric, and A. F. Brito, Integrating spot short-term measurements of carbon emissions and backward dietary energy partition calculations to estimate intake in lactating dairy cows fed ad libitum or restricted, J. Dairy Sci, vol.98, pp.8913-8925, 2015.

A. Jonker, S. M. Hickey, S. J. Rowe, P. H. Janssen, G. H. Shackell et al., Genetic parameters of methane emissions determined using portable accumulation chambers in lambs and ewes grazing pasture and genetic correlations with emissions determined in respiratory chambers, J. Anim. Sci, vol.96, pp.3031-3042, 2018.

P. Huhtanen, E. H. Cabezas-garcia, S. Utsumi, and S. Zimmerman, Comparison of methaods to determine methane emissions from dairy cows in farm conditions, J. Dairy Sci, vol.98, pp.3394-3409, 2015.

P. F. Arthur, T. Bird-gardiner, I. M. Barcia, K. A. Donoghue, and R. M. Herd, Relationships among carbon dioxide, feed intake and feed efficiency traits in ad libitum fed beef cattle, J. Anim. Sci, vol.96, pp.4859-4867, 2018.

T. Bird-gardiner, P. F. Arthur, I. M. Barchia, K. A. Donoghue, and R. M. Herd, Phenotypic relationships among methane production traits assessed under ad libitum feeding of beef cattle, J. Anim. Sci, vol.95, pp.4391-4398, 2017.

. Ipcc, IPCC Guidelines for national greenhouse gas inventories, 2006.

H. J. Van-lingen, M. Niu, E. Kebreab, S. C. Valadares-filho, J. A. Rooke et al., Prediction of enteric methane production, yield and intensity of beef cattle using an intercontinental database, Agric. Ecosyst. Environ, vol.283, 2019.

J. A. Archer, P. F. Arthur, R. M. Herd, P. F. Parnell, and W. S. Pitchford, Optimum postweaning test for measurement of growth rate, feed intake, and feed efficiency in British breed cattle, J. Anim. Sci, vol.75, pp.2024-2032, 1997.

Z. Wang, J. D. Nkrumah, C. Li, J. A. Basarab, L. A. Goonewardene et al., Test duration for growth, feed intake, and feed efficiency in beef cattle using the GrowSafe system, J. Anim. Sci, vol.84, pp.2289-2298, 2006.

, BIF. Guidelines for Uniform Beef Improvement Programs, 2010.

D. Sauvant, S. Giger-reverdin, A. Serment, and L. Broudiscou, Influences des régimes et de leur fermentation dans le rumen sur la production de méthane par les ruminants, INRA Prod. Anim, vol.24, pp.433-446, 2011.

H. C. Freetly and T. M. Brown-brandl, Enteric methane production from beef cattle that vary in feed efficiency, J. Anim. Sci, vol.91, pp.4826-4831, 2013.

H. E. Flay, B. Kuhn-sherlock, K. A. Macdonald, N. Lopez-villalobos, D. J. Donaghy et al., Selecting cattle for low residual feed intake did not affect daily methane production but increased methane yield, J. Dairy Sci, vol.102, pp.1-6, 2018.

E. C. Richardson and R. M. Herd, Biological basis for variation in residual feed intake in beef cattle. 2. Synthesis of results following divergent selection, Aust. J. Exp. Agric, vol.44, pp.431-440, 2004.

P. Løvendahl, G. F. Difford, B. Li, M. G. Chagunda, P. Huhtanen et al., Review: Selecting for improved feed efficiency and reduced methane emissions in dairy cattle, Animal, vol.12, pp.336-349, 2018.

D. W. Olijhoek, P. Løvendahl, J. Lassen, A. L. Hellwing, J. K. Höglund et al., Methane production, rumen fermentation, and diet digestibility of Holstein and Jersey dairy cows being divergent in residual feed intake and fed at 3 forage-to-concentrate ratios, J. Dairy Sci, vol.101, pp.1-15, 2017.

C. Fitzsimons, D. A. Kenny, and M. Mcgee, Visceral organ weights, digestion and carcass characteristics of beef bulls differing in residual feed intake offered a high concentrate diet, Animal, vol.8, pp.949-959, 2014.

A. Fischer, R. Delagarde, and P. Faverdin, Identification of biological traits associated with differences in residual energy intake among lactating Holstein cows, J. Dairy Sci, vol.101, pp.4193-4211, 2017.
URL : https://hal.archives-ouvertes.fr/hal-02623406

P. Huhtanen, M. Ramin, and E. H. Cabezas-garcia, Effects of ruminal digesta retention time on methane emissions: A modelling approach, Anim. Prod. Sci, vol.56, pp.501-506, 2016.

C. S. Pinares-patiño, S. H. Ebrahimi, J. C. Mcewan, H. Clark, and D. Luo, Is rumen retention time implicated in sheep differences in methane emission?, Proc. N. Z. Soc. Anim. Prod, vol.71, pp.219-222, 2011.

J. P. Goopy, A. Donaldson, R. Hegarty, P. E. Vercoe, F. Haynes et al., Low-methane yield sheep have smaller rumens and shorter rumen retention time, Br. J. Nutr, vol.111, pp.578-585, 2014.

J. J. Bond, M. Cameron, A. J. Donaldson, K. L. Austin, S. Harden et al., Aspects of digestive function in sheep related to phenotypic variation in methane emissions, Anim. Prod. Sci, vol.59, pp.55-65, 2019.

R. J. Wallace, J. A. Rooke, N. Mckain, C. A. Duthie, J. J. Hyslop et al., The rumen microbial metagenome associated with high methane production in cattle, BMC Genom, vol.16, 2015.

R. Roehe, R. J. Dewhurst, C. A. Duthie, J. A. Rooke, N. Mccain et al., Bovine host genetic variation influences rumen microbial methane production with best selection criterion for low methane emitting and efficiency feed converting hosts based on metagenomic gene abundance, PLoS Genet, vol.12, 2016.

G. F. Difford, D. R. Plichta, P. Løvendahl, J. Lassen, S. J. Noel et al., Host genetics and the rumen microbiome jointly associate with methane emission in dairy cows, PLoS Genet, vol.14, 2018.

Y. Ramayo-caldas, L. Zingaretti, M. Popova, J. Estellé, A. Bernard et al., Identification of rumen biomarkers linked to methane emission in Holstein cows, J. Anim. Breed. Genet, vol.2019, pp.1-11
URL : https://hal.archives-ouvertes.fr/hal-02495627

F. Li, C. Li, Y. Chen, J. Liu, C. Zhang et al., Host genetics influence the rumen microbiota and heritable rumen microbial features associate with feed efficiency in cattle, vol.7, p.92, 2019.