R. C. Apter and D. D. Householder, Weaning and weaning management of foals: A review and some recommendations, J. Equine Vet. Sci, vol.16, pp.428-435, 1996.

M. Parker, D. Goodwin, and E. S. Redhead, Survey of breeders' management of horses in Europe, North America and Australia: Comparison of factors associated with the development of abnormal behavior, Appl. Anim. Behav. Sci, vol.114, pp.206-215, 2008.

N. K. Waran, N. Clarke, and M. Farnworth, The effects of weaning on the domestic horse

, Appl. Anim. Behav. Sci, vol.110, pp.42-57, 2008.

M. Doreau and S. Boulot, Recent knowledge on mare milk production: A review, Livest. Prod. Sci, vol.22, pp.213-235, 1989.

O. T. Oftedal, H. F. Hintz, and H. F. Schryver, Lactation in the horse: Milk composition and intake by foals, J. Nutr, vol.113, pp.2096-2106, 1983.

D. Burns, P. G. Gibbs, and G. D. Potter, Milk energy production by lactating mares, J. Equine Vet. Sci, vol.12, 1992.

L. Lansade, M. Bertrand, X. Boivin, and M. F. Bouissou, Effects of handling at weaning on manageability and reactivity of foals, Appl. Anim. Behav. Sci, vol.87, pp.131-149, 2004.

S. Ligout, M. F. Bouissou, and X. Boivin, Comparison of the effects of two different handling methods on the subsequent behaviour of Anglo-Arabian foals toward humans and handling, Appl. Anim. Behav. Sci, vol.113, pp.175-188, 2008.

K. Merkies, C. Dubois, K. Marshall, S. Parois, L. Graham et al., A two-stage method to approach weaning stress in horses using a physical barrier to prevent nursing, Appl. Anim. Behav. Sci, vol.183, pp.68-76, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01867032

P. Mcgreevy, J. Berger, N. De-brauwere, O. Doherty, A. Harrison et al., Using the Five Domains Model to Assess the Adverse Impacts of Husbandry, Veterinary, and Equitation Interventions on Horse Welfare, vol.8, p.41, 2018.

K. A. Houpt, H. F. Hintz, and W. R. Butler, A preliminary study of two methods of weaning foals, Appl. Anim. Behav. Sci, vol.12, pp.177-181, 1984.

R. M. Hoffman, D. S. Kronfeld, J. L. Holland, and K. M. Greiwe-crandell, Preweaning diet and stall weaning method influences on stress response in foals, J. Anim. Sci, vol.73, pp.2922-2930, 1995.

R. Erber, M. Wulf, S. Rose-meierhöfer, M. Becker-birck, E. Möstl et al., Behavioral and physiological responses of young horses to different weaning protocols: A pilot study, Stress, vol.15, pp.184-194, 2012.

C. A. Mccall, G. D. Potter, and J. L. Kreider, Locomotor, vocal and other behavioural responses to varying methods of weaning in foals, Appl. Anim. Behav. Sci, vol.14, pp.27-35, 1985.

J. L. Holland, D. S. Kronfeld, R. M. Hoffman, K. M. Griewe-crandell, T. L. Boyd et al., Weaning stress is affected by nutrition and weaning methods, Pferdeheilkunde, vol.12, pp.257-260, 1996.

C. R. Heleski, A. C. Shelle, B. D. Nielsen, and A. J. Zanella, Influence of housing on weanling horse behavior and subsequent welfare, Appl. Anim. Behav. Sci, vol.78, pp.291-302, 2002.

S. Henry, A. J. Zanella, C. Sankey, M. A. Richard-yris, A. Marko et al., Adults may be used to alleviate weaning stress in domestic foals (Equus caballus), Physiol. Behav, vol.106, pp.428-438, 2012.
URL : https://hal.archives-ouvertes.fr/hal-01020422

H. Xiao, L. Zhang, A. Tuohut, G. Shi, and H. Li, Effect of weaning age on stress-related behavior in foals (Equus Caballus) by Abrupt-Group Weaning Method, Phylogenetics Evol. Biol, vol.3, p.151, 2015.

C. A. Mccall, G. D. Potter, J. L. Kreider, and W. L. Jenkins, Physiological responses in foals weaned by abrupt or gradual methods, J. Equine Vet. Sci, vol.7, pp.368-375, 1987.

K. Malinowski, N. A. Hallquist, L. Helyar, A. R. Sherman, and C. G. Scanes, Effect of different separation protocols between mares and foals on plasma cortisol in cell-mediated immune response, Equine Vet. J, vol.10, pp.363-368, 1990.

N. Mach, A. Foury, S. Kittelmann, F. Reigner, M. Moroldo et al., The effects of weaning methods on gut microbiota composition and horse physiology, Front. Physiol, vol.8, p.535, 2017.
URL : https://hal.archives-ouvertes.fr/hal-01578843

J. M. Berger, S. J. Spier, R. Davies, I. A. Gardner, C. M. Leutenegger et al., Behavioral and physiological responses of weaned foals treated with equine appeasing pheromone: A double-blinded, placebo-controlled, randomized trial, J. Vet. Behav, vol.8, pp.265-277, 2013.

T. Gensollen, S. S. Iyer, D. L. Kasper, and R. S. Blumberg, How colonization by microbiota in early life shapes the immune system, Science, vol.352, pp.539-544, 2016.

L. Zhuang, H. Chen, S. Zhang, J. Zhuang, Q. Li et al., Intestinal microbiota in early life and its implications on childhood health, Genom. Proteom. Bioinform, vol.17, pp.13-25, 2019.

A. Waters, C. Nicol, and N. French, Factors influencing the development of stereotypic and redirected behaviours in young horses: Findings of a four year prospective epidemiological study, Equine Vet. J, vol.34, pp.572-579, 2002.

C. J. Nicol and A. J. Badnell-waters, Suckling behaviour in domestic foals and the development of abnormal oral behavior, Anim. Behav, vol.70, pp.21-29, 2005.

R. C. Newberry and J. C. Swanson, Implications of breaking mother-young social bonds, Appl. Anim. Behav. Sci, vol.110, pp.3-23, 2008.

M. Hausberger, E. Gautier, C. Müller, and P. Jego, Lower learning abilities in stereotypic horses, Appl. Anim. Behav. Sci, vol.107, pp.299-306, 2007.
URL : https://hal.archives-ouvertes.fr/hal-01319150

A. Hemmings, S. D. Mcbride, and C. E. Hale, Perseverative responding and the aetiology of equine oral stereotypy, Appl. Anim. Behav. Sci, vol.104, pp.143-150, 2007.

M. Parker, E. S. Redhead, D. Goodwin, and S. D. Mcbride, Impaired instrumental choice in crib-biting horses (Equus caballus), Behav. Brain Res, vol.191, pp.137-140, 2007.

R. Wolter, . Alimentation, and . Cheval, , 1999.

C. P. Moons, K. Laughlin, and A. J. Zanella, Effects of short-term maternal separations on weaning stress in foals, Appl. Anim. Behav. Sci, vol.91, pp.321-335, 2005.

L. Lansade, A. Foury, F. Reigner, M. Vidament, E. Guettier et al., Progressive habituation to separation alleviates the negative effects of weaning in the mother and foal, Psychoneuroendocrinology, vol.97, pp.59-68, 2018.

L. K. Warren, L. M. Lawrence, A. L. Parker, T. Barnes, and A. S. Griffin, The effect of weaning age on foal growth and radiographic bone density, J. Equine Vet. Sci, vol.18, pp.335-342, 1998.

H. Sigurjónsdóttir, M. Van-dierendonck, S. Snorrason, and A. G. Thórhallsdóttir, Social relationships in a group of horses without a mature stallion, Behaviour, vol.140, pp.783-804, 2003.

C. Feh, Relationships and communication in socially natural horse herds. In The Domestic Horse, the Evolution, Development and Management of Its Behavior, pp.83-93, 2005.

S. J. Tyler, The behaviour and social organization of the New Forest ponies, Anim. Behav. Monogr, vol.5, pp.85-196, 1972.

P. Duncan, P. H. Harvey, and S. M. Wells, On lactation and associated behaviour in a natural herd of horses, Anim. Behav, vol.32, pp.255-263, 1984.

S. Crowell-davis and J. Weeks, Maternal behaviour and mare-foal interaction, The Domestic Horse, the Evolution, pp.126-138, 2005.

G. H. Waring, Horse Behavior, 2003.

S. Mcdonnell, In The Domestic Horse, the Evolution, Development and Management of Its Behavior, pp.110-125, 2005.

K. Satué, M. Felipe, J. Mota, and A. Muñoz, Factors influencing gestational length in mares: A review, Livest. Sci, vol.136, pp.287-294, 2011.

P. Chavatte, Twinning in the mare, Equine Vet. Educ, vol.6, pp.286-292, 1997.

M. C. Van-dierendonck, H. Sigurjonsdottir, B. Colenbrander, and A. G. Thorhallsdottir, Differences in social behaviour between late pregnant, post-partum and barren mares in a herd of Icelandic horses, Appl. Anim. Behav. Sci, vol.89, pp.283-297, 2004.

D. Q. Estep, S. L. Crowell-davis, S. A. Earlcostello, and S. A. Beatey, Changes in the social-behavior of drafthorse (Equus caballus) mares coincident with foaling, Appl. Anim. Behav. Sci, vol.35, pp.199-213, 1993.

H. Klingel, Social organization and reproduction in equids, J. Reprod Fertil. Suppl, vol.23, pp.7-11, 1975.

C. Houpt, Formation and dissolution of mare-foal bond, Appl. Anim. Behav. Sci, vol.78, pp.1-11, 2002.

E. Z. Cameron, K. J. Stafford, W. L. Linklater, and C. J. Veltman, Suckling behaviour does not measure milk intake in horses, Equus caballus. Appl. Anim. Behav. Sci, vol.57, pp.673-678, 1999.

S. L. Crowell-davis, Nursing behaviour and maternal aggression among Welsh ponies (Equus caballus), Appl. Anim. Behav. Sci, vol.14, pp.11-25, 1985.

J. A. Barber and S. L. Crowell-davis, Maternal behavior of Belgian (Equus caballus) mares, Appl. Anim. Behav. Sci, vol.41, pp.161-189, 1994.

J. Barto?ová, M. Komárková, J. Dubcová, L. Barto?, and J. Pluhá?ek, Concurrent lactation and pregnancy: Pregnant domestic horse mares do not increase mother-offspring conflict during intensive lactation, PLoS ONE, vol.6, 2011.

J. D. Feist and D. R. Mccullough, Behaviour patterns and communication in feral horses, Z. Tierpsychol, vol.41, pp.337-373, 1976.

I. Becvarova and V. Buechner-maxwell, Feeding the foal for immediate and long-term health, Equine Vet. J. Suppl, vol.41, pp.149-156, 2012.

S. L. Crowell-davis and K. A. Houpt, Coprophagy by foals: Effect of age and possible functions, Equine Vet. J, vol.17, pp.17-19, 1985.

K. Francis-smith and D. G. Wood-gush, Coprophagia as seen in Thoroughbred foals, Equine Vet. J, vol.9, pp.155-157, 1977.

S. L. Marinier and A. J. Alexander, Coprophagy as an avenue for foals of the domestic horse to learn food preferences from their dams, J. Theor. Biol, vol.173, pp.121-124, 1995.

S. Henry, D. Hemery, M. A. Richard, and M. Hausberger, Human-mare relationships and behaviour of foals toward humans, Appl. Anim. Behav. Sci, vol.93, pp.341-362, 2005.
URL : https://hal.archives-ouvertes.fr/hal-01360042

S. Henry, S. Briefer, M. A. Richard-yris, and M. Hausberger, Are 6-month-old foals sensitive to dam's influence?, Dev. Psychobiol, vol.48, pp.514-521, 2007.

S. L. Crowell-davis, Spatial relations between mares and foals of the Welsh pony (Equus caballus), Anim. Behav, vol.34, pp.1007-1015, 1986.

C. Faubladier, S. Sadet-bourgeteau, C. Philippeau, E. Jacotot, and V. Julliand, Molecular monitoring of the bacterial community structure in foal feces pre-and post-weaning, Anaerobe, vol.25, pp.61-66, 2014.
URL : https://hal.archives-ouvertes.fr/hal-01770537

J. John, K. Roediger, W. Schroedl, and N. Aldaher, Vervuert, I. Development of intestinal microflora and occurrence of diarrhoea in sucking foals: Effects of Bacillus cereus var. toyoi supplementation, BMC Vet. Res, vol.11, 2015.

S. Quercia, F. Freccero, C. Castagnetti, M. Soverini, S. Turroni et al., Early colonisation and temporal dynamics of the gut microbial ecosystem in Standardbred foals, Equine Vet. J, vol.51, pp.231-237, 2019.

M. Hausberger, L. Lansade, S. Henry, and W. Martin-rosset, Behaviour and behavioural management of horse behavior during breeding and stabling, Equine Nutrition, pp.505-512, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01229921

M. Bourjade, Sociogenèse et Expression des Comportements Individuels et Collectifs chez le Cheval [Sociogeny and Manifestation of Individual and Collective Behaviours in Horses, 2007.

A. Wolff and M. Hausberger, Behaviour of foals before weaning may have some genetic basis, Ethology, vol.96, pp.1-10, 1994.

S. Henry, M. A. Richard-yris, S. Tordjman, and M. Hausberger, Neonatal handling affects durably bonding and social development, PLoS ONE, vol.4, p.5216, 2009.
URL : https://hal.archives-ouvertes.fr/hal-01319140

M. Hausberger, S. Henry, C. Larose, and M. A. Richard-yris, First suckling: A crucial event for mother-young attachment? An experimental study in horses (Equus caballus), J. Compar. Psychol, vol.121, pp.109-112, 2007.
URL : https://hal.archives-ouvertes.fr/hal-01319147

J. Berger, Wild Horses of the Great Basin, 1986.

E. Z. Cameron and W. L. Linklater, Individual mares bias investment in sons and daughters in relation to their condition, Anim. Behav, vol.60, pp.359-367, 2000.

M. Hausberger and M. A. Richard-yris, Individual differences in the domestic horse, origins, development and stability, pp.33-52, 2005.
URL : https://hal.archives-ouvertes.fr/hal-01319153

A. T. Rutberg and R. R. Keiper, Proximate causes of natal dispersal in feral ponies: Some sex differences, Anim. Behav, vol.46, pp.969-975, 1993.

J. Cohen, A coefficient of agreement for nominal scales, Educ. Psychol. Meas, vol.20, pp.37-46, 1960.

J. Altmann, Observational study of behaviour: Sampling methods, Behaviour, vol.49, pp.227-267, 1974.

G. Arnaud, H. Dubroeucq, and D. Rivot, Notation de L'état Corporel des Chevaux de Selle et de Sport

. Inra, , 1997.

S. Siegel and J. Castellan, Nonparametric Statistics for the Behavioral Sciences, 1988.

H. Benhajali, M. Ezzaouia, C. Lunel, F. Charfi, and M. Hausberger, Temporal feeding pattern may influence reproduction efficiency, the example of breeding mares, PLoS ONE, vol.8, 2013.
URL : https://hal.archives-ouvertes.fr/hal-01019942

. Horsesport, , 2016.

J. Bowlby, Attachment and Loss; Attachment, vol.1, 1969.

H. F. Harlow, The development of affectional patterns in infant monkeys, In Determinants of Infant Behaviour

B. M. Foss and E. Wiley, , vol.1, 1961.

H. F. Harlow and M. K. Harlow, The affectional systems, Behavior of Nonhuman Primates: Modern Research Trends

A. M. Schrier, F. Harry, F. Harlow, and F. Stollnitz, , pp.287-334, 1965.

C. R. Pryce, D. Rüedi-bettschen, A. C. Dettling, A. Weston, H. Russig et al., Long-term effects of early-life environmental manipulations in rodents and primates: Potential animal models in depression research, Neurosci. Biobehav. Rev, vol.29, pp.649-674, 2005.

J. W. Christensen, Early-life object exposure with a habituated mother reduces fear reactions in foals, Anim. Cogn, vol.19, pp.171-179, 2016.

H. Benhajali, M. A. Richard-yris, M. Ezzaouia, F. Charfi, and M. Hausberger, Reproductive status and stereotypies in breeding mares: A brief report, Appl. Anim. Behav. Sci, vol.128, pp.64-68, 2010.
URL : https://hal.archives-ouvertes.fr/hal-01022332

H. Sigurjónsdóttir and H. Haraldsson, Significance of Group Composition for the Welfare of Pastured Horses, vol.9, 2019.

S. Camus, C. Rochais, C. Blois-heulin, Q. Li, and M. Hausberger, Birth origin differentially affects depressive-like behaviours: Are captive-born cynomolgus monkeys more vulnerable to depression than their wild-born counterparts?, PLoS ONE, vol.8, 2013.
URL : https://hal.archives-ouvertes.fr/hal-01052723

F. D. Mcmillan, Behavioral and psychological outcomes for dogs sold as puppies through pet stores and/or born in commercial breeding establishments: Current knowledge and putative causes, J. Vet. Behav, vol.19, pp.14-26, 2017.

M. B. Hurt, J. Stella, C. Croney, and . Online, , p.25, 2020.

D. M. Weary, J. Jasper, and M. J. Hötzel, Understanding weaning distress, Appl. Anim. Behav. Sci, vol.110, pp.24-41, 2008.

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