R. H. Armstrong, E. Robertson, C. S. Lamb, I. J. Gordon, and D. A. Elston, Diet selection by lambs in ryegrass-white clover swards differing in the horizontal distribution of clover, Proceedings of the XVIIth International Grassland Congress, pp.715-716, 1993.

J. Aufrère and B. Michalet-doreau, In vivo digestibility and prediction of digestibility of some hay products, in: Feeding Value of By-Products and Their Use by Beef Cattle, EEC Seminar EUR, vol.8918, pp.25-35, 1983.

D. W. Bailey, B. Dumont, and M. F. Wallisdevries, Utilization of heterogeneous grasslands by domestic herbivores: Theory to management, Ann. Zootech, vol.47, pp.321-333, 1998.
URL : https://hal.archives-ouvertes.fr/hal-00889734

D. W. Bailey, L. R. Rittenhouse, R. H. Hart, D. M. Swift, and R. W. Richards, Association of relative food availabilities and locations by cattle, J. Range Manage, vol.42, pp.480-482, 1989.

S. Benhamou, Spatial memory and searching efficiency, Anim. Behav, vol.47, pp.1423-1433, 1994.

M. F. Bouissou, A. Boissy, P. Le-neindre, and I. Veissier, The social behaviour of cattle, Social Behaviour in Farm Animals, CAB International, pp.113-145, 2001.
URL : https://hal.archives-ouvertes.fr/hal-02827149

M. L. Cain, Random search by herbivorous insects: a simulation model, Ecology, vol.66, pp.876-888, 1985.

P. Carrère, F. Louault, J. F. Soussana, F. De, P. C. Carvalho et al., How does the vertical and horizontal structure of a grass and clover sward influence grazing?, Grass For. Sci, vol.56, pp.118-130, 2001.

D. A. Clark and P. S. Harris, Composition of the diet of sheep grazing swards of differing white clover content and spatial distribution, N.Z. J. Agric. Res, vol.28, pp.233-240, 1985.

J. L. Clarke, D. Welch, and I. J. Gordon, The influence of vegetation pattern on the grazing of heather moorland by red deer and sheep. I. The location of animals on grass/heather mosaics, J. Appl. Ecol, vol.32, pp.166-176, 1995.

M. B. Coughenour, Spatial components of plant-herbivore interactions in pastoral, ranching, and native ungulate ecosystems, J. Range Manage, vol.44, pp.530-542, 1991.

K. Danell, L. Edenius, and P. Lundberg, Herbivory and tree stand composition: moose patch use in winter, Ecology, vol.72, pp.1350-1357, 1991.

B. Dumont and A. Boissy, Grazing behaviour of sheep in a situation of conflict between feeding and social motivations, Behav. Proc, vol.49, pp.131-138, 2000.
URL : https://hal.archives-ouvertes.fr/hal-02692089

B. Dumont, J. F. Maillard, and M. Petit, The effect of the spatial distribution of plant species within the sward on the searching success of sheep when grazing, Grass For. Sci, vol.55, pp.138-145, 2000.
URL : https://hal.archives-ouvertes.fr/hal-02690254

B. Dumont and M. Petit, Spatial memory of sheep at pasture, Appl. Anim. Behav. Sci, vol.60, pp.43-53, 1998.
URL : https://hal.archives-ouvertes.fr/hal-02684254

C. M. Dwyer and A. B. Lawrence, Ewe-ewe and ewe-lamb behaviour in a hill and a lowland breed of sheep: a study using embryo transfer, Appl. Anim. Behav. Sci, vol.61, pp.319-334, 1999.

G. R. Edwards, J. A. Newman, A. J. Parsons, and J. R. Krebs, Effects of the scale and spatial distribution of the food resource and animal state on diet selection: an example with sheep, J. Anim. Ecol, vol.63, pp.816-826, 1994.

H. K. Goering and P. J. Van-soest, Forage fiber analyses, in: Agricultural Handbook No. 379, US Department of Agriculture, pp.1-20, 1970.

A. J. Hester, I. J. Gordon, G. J. Baillie, and E. Tappin, Foraging behaviour of sheep and red deer within natural heather/grass mosaics, J. Appl. Ecol, vol.36, pp.133-146, 1999.

N. T. Hobbs, Response of large herbivores to spatial heterogeneity in ecosystems, Nutritional Ecology of Herbivores, Proceedings of the Vth International Symposium on the Nutrition of Herbivores, pp.97-129, 1999.

K. A. Kershaw, Quantitative and Dynamic Plant Ecology, 1973.

E. A. Laca, Modelling spatial aspects of plant-animal interactions, CAB International, pp.209-231, 2000.

E. A. Laca and M. W. Demment, The Ecology and Management of Grazing Systems, CAB International, pp.137-158, 1996.

E. A. Laca and I. M. Ortega, Integrating foraging mechanisms across spatial and temporal scales, Rangelands in a Sustainable Biosphere, Proceedings of the Vth International, vol.380

R. Congress, Society for Range Management, vol.2, pp.129-132, 1996.

D. S. Olton, G. E. Handelmann, and J. A. Walker, Spatial memory and food searching strategies, Foraging Behavior: Ecological, Ethological, and Psychological Approaches, pp.333-354, 1981.

A. J. Parsons, P. Carrère, S. Schwinning, G. Lemaire, J. Hodgson et al., Dynamics of heterogeneity in a grazed sward
URL : https://hal.archives-ouvertes.fr/hal-02765873

, Grassland Ecophysiology and Grazing Ecology, CAB International, pp.289-315, 2000.

A. J. Parsons, J. H. Thornley, J. A. Newman, and P. D. Penning, A mechanistic model of some physical determinants of intake rate and diet selection in a two species temperate grassland sward, Funct. Ecol, vol.8, pp.187-204, 1994.

S. Prache, J. Damasceno, and G. Béchet, Preferences of sheep grazing down conterminal monocultures of Lolium perenne -Festuca arundinacea: test of an energy intake-rate maximization hypothesis, pp.258-259, 2002.

M. E. Ritchie, Scale-dependent foraging and patch choice in fractal environments, Evol. Ecol, vol.12, pp.309-330, 1998.

S. J. Rodway-dyer, J. E. Cook, and A. J. Rook, Effect of resource density on the use of spatial memory by foraging sheep, Proceedings of the Annual Meeting of the British Society, p.63, 2001.

A. M. Sibbald and R. J. Hooper, Trade-offs between social behaviour and foraging by sheep in heterogeneous pastures, Behav. Proc, 2002.

A. M. Sibbald, D. J. Smith, and R. J. Hooper, Individual differences in sociability and their consequences for foraging behaviour in sheep, Proceedings of the Annual Meeting of the British Society of Animal Science, p.129, 2000.

, Statistical Analysis System, SAS/STAT Guide for personal computers, version 6.11, SAS Institute Inc, 1989.

J. H. Thornley, A. J. Parsons, J. A. Newman, and P. D. Penning, A cost-benefit model of grazing intake and diet selection in a two-species temperate grassland sward, Funct. Ecol, vol.8, pp.5-16, 1994.

I. Veissier, P. Le-neindre, and G. Trillat, The use of circadian behaviour to measure adaptation of calves to changes in their environment, Appl. Anim. Behav. Sci, vol.22, pp.1-12, 1989.
URL : https://hal.archives-ouvertes.fr/hal-02716717

M. F. Wallisdevries, Effects of resource distribution patterns on ungulate foraging behaviour: a modelling approach, For. Ecol. Manage, vol.88, pp.167-177, 1996.

M. F. Wallisdevries, E. A. Laca, and M. W. Demment, The importance of scale of patchiness for selectivity in grazing herbivores, Oecologia, vol.121, pp.355-363, 1999.