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Duncan, P. |
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Title |
Foal killing by stallions |
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Journal Article |
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Year |
1982 |
Publication |
Applied Animal Ethology |
Abbreviated Journal |
Appl. Animal. Ethol. |
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8 |
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6 |
Pages |
567-570 |
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Abstract |
Feral horses live in social systems similar to those of some species in which infant killing has been reported (e.g. lions), but such behaviour has been reported neither in horses nor in any other ungulate. The results of interviews with owners of free-ranging horses (Camargue breed) are given which show that, though rare, infant killing occurs in this breed, and that it seems to be confined to male foals. It is argued that the observed behaviour cannot simply be considered as pathological, and that close attention should be paid to the possibility that it occurs in wild and feral equids. |
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0304-3762 |
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Equine Behaviour @ team @ |
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5260 |
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Author |
Duncan, P. |
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Title |
Determinants of the use of habitat by horses in a mediterranean wetland |
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Journal Article |
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Year |
1983 |
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J. Anim. Ecol. |
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52 |
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93-109 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1031 |
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Duncan, P.; Foose, T. J.; Gordon, I. J.; Gakahu,C. G.; Lloyd, M. |
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Title |
Comparative nutrient extraction from forages by grazing bovids and equids: a test of the nutritional model of equid/bovid competition and coexistence |
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Year |
1990 |
Publication |
Oecologia |
Abbreviated Journal |
Oecologia |
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84 |
Issue |
3 |
Pages |
411-418 |
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Ruminant – Hind-gut fermenter – Intake – Digestion – Competition |
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Ruminants are unevenly distributed across the range of body sizes observed in herbivorous mammals; among extant East African species they predominate, in numbers and species richness, in the medium body sizes (10-600 kg). The small and the large species are all hind-gut fermenters. Some medium-sized hind-gut fermenters, equid perissodactyls, coexist with the grazing ruminants, principally bovid artiodactyls, in grassland ecosystems. These patterns have been explained by two complementary models based on differences between the digestive physiology of ruminants and hind-gut fermenters. The Demment and Van Soest (1985) model accounts for the absence of ruminants among the small and large species, while the Bell/Janis/Foose model accounts both for the predominance of ruminants, and their co-existence with equids among the medium-sized species (Bell 1971; Janis 1976; Foose 1982). The latter model assumes that the rumen is competitively superior to the hind-gut system on medium quality forages, and that hind-gut fermenters persist because of their ability to eat more, and thus to extract more nutrients per day from high fibre, low quality forages. Data presented here demonstrate that compared to similarly sized grazing ruminants (bovids), hind-gut fermenters (equids) have higher rates of food intake which more than compensate for their lesser ability to digest plant material. As a consequence equids extract more nutrients per day than bovids not only from low quality foods, but from the whole range of forages eaten by animals of this size. Neither of the current nutritional models, nor refinements of them satisfactorily explain the preponderance of the bovids among medium-sized ungulates; alternative hypotheses are presented. |
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from Professor Hans Klingels Equine Reference List |
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yes |
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Call Number |
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1035 |
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