Asa Cs,. (1979). Sociosexual behavior in the domestic pony. In Symposium on the Ecology and Behavior of Wild and Feral Equids (pp. 59–70). Laramie: Univ. of Wyoming.
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Conley W,. (1979). The potential for increase in horse and ass populations: A theoretical analysis. Symp Ecol and Behav of wild and feral Equids, Laramie, , 221–234.
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Ginsberg, J. R., & Rubenstein, D. I. (1990). Sperm competiton and variation in zebra mating behaviour. Behav. Ecol. Sociobiol., 26(6), 427–434.
Abstract: Data are presented on the breeding behavior of two zebra species to test whether intra- and interspecific variation in male reproductive behavior and physiology are correlated with differences in female promiscuity. In one species, plains zebra (Equus burchelli) females live in closed membership single male groups and mate monandrously. In the other species, the Grevy's zebra (E. grevyi) females live in groups whose membership is much more temporary. Typically, associations with individual males are brief and mating is polyandrous. However, some females – those having just given birth – reside with one male for long periods, mating monandrously. These differences in female mating behavior generate variability in the potential for sperm competition. We show that behavioral differences in male investment in reproductive activities correlate with the potential for sperm competition. When mating with promiscuous mares, Grevy's zebra stallions made a greater investment in reproductive behavior (calling, mounting, ejaculations) than did stallions of either species when mating with monandrous females. The evolution of large testes size in the Grevy's zebra, when compared to the congeneric plains zebra, horse, and mountain zebra, allows for this increased investment.
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Keiper Rr,. (1979). Population dynamics of feral ponies. Laramie: Symposium on the Ecology and Behavior of wild and feral Equids.
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Klingel H,. (1980). A Comparison of the Social Organization of the Equids. in Denniston RH (ed).
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Ruffner Ga, C. S. (1979). Age structure, condition, and reproduction of two burro (Equus asinus) populations from Grand Canyon National Park, Arizona.
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Waring Gh,. (1979). Behavioral adaptation as a factor in management of feral equids.
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Wolfe Ml,. (1979). Feral horse demography: A preliminary report (Abstract).
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Wolfe Ml,. (1979). Population ecology of the kulan.
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Woodward Sl,. (1979). Population dynamics of a herd of feral burros (Abstract).
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