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Ryder, O. A., & Massena, R. (1988). A case of male infanticide in Equus przewalskii. Appl. Anim. Behav. Sci., 21(1-2), 187–190.
Abstract: Following the introduction of a new stallion to a band of E. przewalskii mares two births, both of male foals, resulted in foal death due to injuries sustained in the first day of life. Neither foal was sired by the new herd stallion. The second foal death was the results of an observed attack on the newborn male and is described here. Subsequently births in the same enclosure and, in one instance, to the same mare whose previous foal was killed, were of foals sired by the new stallion and were uneventful, with 3 male foals surviving to date.
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Schilder, M. B. H. (1988). Dominance relationships between adult Plains zebra stallions in semi – captivity. Behaviour, 104(3-4), 300–319.
Abstract: The relationships between 4-5 adult zebra stallions, living in a safari park, were investigated over a period of 5 years. Asymmetries in the distributions of a number of behaviours could be explained by adopting dominance as an intervening variable. Dominance in stallions was of a bipolar nature with on the one hand behaviours representing subordinance and defence, and on the other hand behaviours reinforcing and confirming dominance. Expression of formal dominance seems to play a minor role. The dyadic relationships of stallions differed as to the number of behaviours reflecting dominance relationships. Although often linear rank-orders could be constructed, these rank-orders were not necessarily identical. This means that the concept of dominance is of only limited value for describing relationships between zebra stallions.
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Penzhorn Bl,. (1988). Equus zebra. Mammalian Species, 314, 1–7.
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Penzhorn, B. L., & van der Merwe, N. J. (1988). Testis size and onset of spermatogenesis in Cape mountain zebras (Equus zebra zebra). J Reprod Fert, 83, 371–375.
Abstract: Testis mass of adult Cape mountain zebra stallions (mean 70·0 g) was appreciably less than that of other zebra species and domestic horses. The histological appearance of the testes of 11-, 24- and 29-month-old colts was typically prepubertal. Spermatogenic activity of a 4-year-old stallion obtained at the end of summer was at a very low level, while a 4·5-year-old stallion obtained 6 weeks after the winter solstice showed a marked increase in spermatogenesis compared with the 4-year-old. Stallions 6·5-19 years of age collected in different seasons all showed active spermatogenesis.
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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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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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Houpt Ka, H. T. (1988). Social and illumination preferences of mares. J Anim Sci, 66, 2159–2164.
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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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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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