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Ginsberg, J. R. (1988). Social organisation and mating strategies of an arid adapted equid: The Grevy`s zebra. Ph.D. thesis, Princeton University, Princeton.
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Boyd, L.,. (1988). The behavior of Przewalski's horses. Ph.D. thesis, , Cornell University.
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Fielding D,. (1988). Reproductive characteristics of the Jenny donkey – Equus Asinus: a review. Trop Anim Hlth Prod, 20, 161–166.
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Franke Stevens E,. (1988). Contents between bands of feral horses for access to fresh water: the resident wins. Anim Beh, 36(6), 1851–1853.
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Geyer Cj, T. E. (1988). Gene survival in the Asian wild horse: I. Dependence of gene survival in the Calgary breeding group pedigree. Zoo Biol, 7, 313–327.
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HOGAN ES et al,. (1988). The effect of enclosure size on sozial interactions and daily activity patterns of the captive asiatic wild horse. Appl Anim Behav Sci, 21, 147–168.
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Houpt Ka, H. T. (1988). Social and illumination preferences of mares. J Anim Sci, 66, 2159–2164.
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KIRKPATRICK JF et al,. (1988). Pregnancy determination in uncaptured feral Horses based on steroid metabolites in urine – soaked snow and free steroids in feces.
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KOTERBA AM et al,. (1988). Brathing strategy of the adult horse at rest. J Appl Physiol, 64, 337–346.
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NOVELLIE PA et al,. (1988). Factors affecting the seasonal movements of Cape mountain zebras in the Mountain Zebra National Park. S Afr J Zool, 23, 13–19.
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