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Albentosa, M. J., Kjaer, J. B., & Nicol, C. J. (2003). Strain and age differences in behaviour, fear response and pecking tendency in laying hens. Br Poult Sci, 44(3), 333–344.
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Swanson, J. C. (1995). Farm animal well-being and intensive production systems. J. Anim Sci., 73(9), 2744–2751.
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Hamilton, W. D. (1971). Geometry for the selfish herd. J. Theor. Biol., 31(2), 295–311.
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Thrower, W. R. (1970). Aggression in horses. Proc R Soc Med, 63(2), 163–167.
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Ionita, J. C., Poncet, P. A., Doherr, M. G., & Steiger, A. (2006). [Evaluation of the quality of husbandry of Franches-Montagnes horses in their breeding farms]. Schweiz Arch Tierheilkd, 148(4), 191–197.
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Poncet, P. A., Ionita, J. C., Doherr, M. G., & Steiger, A. (2006). [The influence of the socio-economic structure of the breeding farms of Franches-Montagnes horses on the conditions of husbandry]. Schweiz Arch Tierheilkd, 148(4), 183–189.
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Isenbugel, E. (2002). [From wild horse to riding horse]. Schweiz Arch Tierheilkd, 144(7), 323–329.
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Clutton-Brock, T. H., Russell, A. F., Sharpe, L. L., Brotherton, P. N., McIlrath, G. M., White, S., et al. (2001). Effects of helpers on juvenile development and survival in meerkats. Science, 293(5539), 2446–2449.
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Haring, H. (2005). Development, level and prospects of the german horse breeding. Zuechtungskunde, 77(6), 490–495.
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Benhajali, H., Richard-Yris, M. - A., Ezzaouia, M., Charfi, F., & Hausberger, M. (2010). Reproductive status and stereotypies in breeding mares: A brief report. Appl. Anim. Behav. Sci., 128(1-4), 64–68.
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