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Keiper Rr,. (1986). The Przewalski horse ecosystem: programs and progress. In Majumdaret al : Endangered and threatened species programs in Pensylvania and other States.
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Wickert, M. (2012). Die Bedeutung des Leerkauens bei Pferden aus Sicht der Physiologie und der Ethologie. Doctoral thesis, , .
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Keiper, R. R., Moss, M., & Zervanos, S. (1980). Daily and seasonal patterns of feral ponies on Assateague Island. In 2nd Conference on Scientific Research in the National Parks.
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KING JM et al,. (1966). The reproductive physiology of male zebra. Symp Zool Soc Lond 15, , donkey hybrids.
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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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Joubert, E. (1972). Mountain zebra behaviour. Zool. Afr., 7.
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Kolter L,. (1984). Soziale Beziehungen zwischen Pferden und deren Auswirkungen auf die Aktivität bei Gruppenhaltung.
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Krumbiegel I,. (1958). Einhufer. Die Neue Brehm – Bücherei, 208.
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Lang Em,. (1980). Erfahrungen mit Somaliawildeseln. Liber Amicorum Walter den Bergh, .
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Lloyd Ph, & RASA.O. Status, reproductive success and fitness in Cape Mountain Zebra.
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