The captive plains zebra are characterised by a high incidence of male infanticide and feticide. One of the most common reasons why infanticide and feticide occur is the introduction of a new male into a herd. In the present study, we used twice as much data, including nine plains zebra herds from four Czech zoos, compared to our previous study on this topic. As a result, both of the statistical models that we tested were significant. The probability of the death of a foal was greatest when a new male was introduced into the herd just after conception. The probability of a foal to die in the presence of the new male was nearly 100% during the first two months of age and decreased as the foal aged. The foal’s probability to die, depending on the timing of the introduction of a new male or the foal’s age, was neither affected by the zoo nor the subspecies. In this paper, we also describe a fourth case of male feticide in plains zebra. Our results demonstrate the highest occurrence of infanticide and feticide among ungulates caused by males.
The long-term mortality conditions in Slovakia significantly lagged for demographically most advanced European countries. Mortality is one of the two main demographic processes which in the context of demographic transition undergone significant changes. The interbellum period constitutted for the population development and reproductive behaviour in Slovakia one of the most important developmental period. it is the period in which continued and deepened considerably significant quantitative and qualitative changes in the process of mortality. The aim of this paper is to analyze intensity and character of mortality in Slovakia in interwar period and to describe their changes and development. Special attention is paid to the level and character of infant mortality, differential analysis by age, sex, nationality, religion and causes of death., Branislav Šprocha, Pavol Tišliar., and Obsahuje bibliografii