| Records |
Author  |
Asa, C.S. |
| Title |
Male reproductive success in free-ranging feral horses |
Type |
Journal Article |
| Year |
1999 |
Publication |
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Abbreviated Journal |
Behavioral Ecology and Sociobiology |
| Volume |
47 |
Issue |
1-2 |
Pages |
89-93 |
| Keywords |
Key words Reproductive success; Alternative mating strategies; Mating systems; Paternity |
| Abstract |
In the social organization of feral horses, adult males compete to monopolize groups or bands of females, sometimes called harems. Alternative male strategies are to remain alone or with other bachelors or, less commonly, to accept subordinate status within a harem. The hypothesis that dominant harem stallion status confers a reproductive advantage was tested in free-ranging feral horses. The presence of foals in harems headed by vasectomized (VSX) versus intact stallions was used to assess the ability of these stallions to control reproduction in their harems. Of harems headed by VSX stallions, 17 and 33% contained foals during years 2 and 3 post-treatment, respectively. In contrast, 86 and 80% of harems headed by non-VSX stallions contained foals in those years. Acquisition of pregnant mares appeared more likely than sneak copulations by bachelor stallions to account for foals in harems with a single stallion. However, most foals were born into harems that included a subordinate stallion, an occurrence that was undoubtedly exacerbated by the extended breeding season resulting from the sterility of the harem stallion. Thus, in comparing alternative reproductive tactics, bachelors appeared less successful than subordinate stallions within a harem. However, the highest reproductive success was achieved by the harem stallion, further demonstrating that alternative tactics are not equally profitable. |
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| Publisher |
Springer-Verlag |
Place of Publication |
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| Language |
English |
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| ISSN |
0340-5443 |
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| Notes |
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no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5786 |
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| Author |
Bartoš, L.; Bartošová, J.; Pluhácek, J.; Šindelárová, J. |
| Title |
Promiscuous behaviour disrupts pregnancy block in domestic horse mares |
Type |
Journal Article |
| Year |
2011 |
Publication |
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Abbreviated Journal |
Behavioral Ecology and Sociobiology |
| Volume |
65 |
Issue |
8 |
Pages |
1567-1572 |
| Keywords |
Foetal loss; Domestic horse; Bruce effect; Sexual behaviour |
| Abstract |
Based on questionnaires from horse breeders, we found that bringing a pregnant mare which had been mated away from home into a vicinity of a familiar male who was not the father of her foetus increased probability of pregnancy disruption. These mares aborted in 31% of cases, while none of those mated within the home stable aborted. Repeated sexual activity either by a stallion or dominant gelding from the normal home group was observed shortly after the mare came from away-mating. Pregnant mares isolated from home males by a fence were even seen soliciting them over the fence. We speculate that, once returned to the home “herd”, and introduced to familiar males, mares were more likely to terminate their pregnancy to save energy and avoid likely future infanticidal loss of their progeny by dominant male(s) of the home social group. This is a newly discovered phenomenon where a mare manipulates the male’s paternity assessment by promiscuous mating. It may explain a common increased incidence of foetal loss in domestic horses occurring in nearly 40% of pregnancies. We conclude that the common practice of transporting the mare for mating and then bringing her back to an environment with males, stallions or geldings, which did not sire the foetus, is the main cause of high percentages of pregnancy disruption in domestic horses. |
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Springer-Verlag |
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English |
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0340-5443 |
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no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5834 |
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| Author |
Gakahu Cg, |
| Title |
Strategies of feeding behavior in the Common zebra, Equus burchelli (Gray) in Amboseli National Park, Kenya (Abstract) |
Type |
Journal Article |
| Year |
1979 |
Publication |
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Abbreviated Journal |
Symposium on the Ecology and Behavior of wild and feral Equids, Laramie |
| Volume |
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Issue |
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Pages |
158 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
| Call Number |
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Serial |
1100 |
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| Author |
JORDAN JW et al, |
| Title |
Summer diets of feral burros (Equus asinus) in Grand Canyon National Park, Arizona |
Type |
Journal Article |
| Year |
1979 |
Publication |
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Abbreviated Journal |
Symposium on the Ecology and Behavior of wild and feral Equids, Laramie |
| Volume |
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Issue |
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Pages |
15-22 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
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Serial |
1222 |
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| Author |
KIRKPATRICK JF et al, |
| Title |
Adrenal corticosteroids and their use in monitoring stress in captive feral horses (Abstract) |
Type |
Journal Article |
| Year |
1979 |
Publication |
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Abbreviated Journal |
Symposium on the Ecology and Behavior of wild and feral Equids, Laramie |
| Volume |
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Issue |
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Pages |
49-50 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
| Call Number |
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Serial |
1270 |
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| Author |
KIRKPATRICK JF et al, |
| Title |
Seasonal estrus patterns in captive feral mares (Abstract) |
Type |
Journal Article |
| Year |
1979 |
Publication |
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Abbreviated Journal |
Symposium on the Ecology and Behavior of wild and feral Equids, Laramie |
| Volume |
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Issue |
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Pages |
39-40 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
| Call Number |
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Serial |
1271 |
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| Author |
Lloyd, P.H.; Rasa, O.A.E. |
| Title |
Status, reproductive success and fitness in Cape mountain zebra (Equus zebra zebra) |
Type |
Journal Article |
| Year |
1989 |
Publication |
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Abbreviated Journal |
Behavioral Ecology and Sociobiology |
| Volume |
25 |
Issue |
6 |
Pages |
411-420 |
| Keywords |
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| Abstract |
Demographic data relating to herd size and stability are given for a population of Cape mountain zebra (Equus zebra zebra) under longterm observation. Temporal dispersion patterns of male and female offspring differed and were independent of the mother's status. Dispersion in females appeared to be related to physiological state, and dispersion in both sexes was related to age rather than changes in parental behaviour. Reproductive success of dominant and subordinate mares was equal and independent of age and social and reproductive variables. Fitness of dominant mares, however, was significantly higher than that of subordinates, the latter having a higher foal mortality, part of which could be attributable to dominants' aggression. The fitness of all males born was 1.6:1 compared with all females. Dominant mares produced significantly more daughters than sons. This trend was not found for subordinates. Mother's status was positively correlated with dominant status in her female offspring but not related to the subsequent status of her sons. Daughters had a more than twice as great a chance of breeding than sons. For maximum fitness gains, therefore, dominant mares should produce more daughters, since a high proportion of these would also have high status and fitness. This tendency is reflected in the sex ratio skewed towards females found for dominant mares. |
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Springer-Verlag |
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English |
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0340-5443 |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5787 |
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| Author |
Mccort Wd, |
| Title |
The feral asses (Equus asinus) of Ossabaw Island, Georgia: Mating system and the effects of Vasectomies as a population. Control Procedure |
Type |
Journal Article |
| Year |
1979 |
Publication |
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Abbreviated Journal |
Symposium on the Ecology and Behavior of wild and feral Equids, Laramie |
| Volume |
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Issue |
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Pages |
71-83 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
| Call Number |
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Serial |
1374 |
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| Author |
McGreevy, P.D.; Harman, A.; McLean, A.; Hawson, L. |
| Title |
Over-flexing the horse's neck: A modern equestrian obsession? |
Type |
Journal Article |
| Year |
2010 |
Publication |
Journal of Veterinary Behavior: Clinical Applications and Research |
Abbreviated Journal |
Journal of Veterinary Behavior: Clinical Applications and Research |
| Volume |
5 |
Issue |
4 |
Pages |
180-186 |
| Keywords |
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| Abstract |
We used an opportunistic review of photographs of different adult and juvenile horses walking, trotting, and cantering (n = 828) to compare the angle of the nasal plane relative to vertical in feral and domestic horses at liberty (n = 450) with ridden horses advertised in a popular Australian horse magazine (n = 378). We assumed that horses in advertisements were shown at, what was perceived by the vendors to be, their best. Of the ridden horses, 68% had their nasal plane behind the vertical. The mean angle of the unridden horses at walk, trot, and canter (30.7 ± 11.5; 27.3 ± 12.0; 25.5 ± 11.0) was significantly greater than those of the ridden horses (1.4 ± 14.1; ?5.1 ± ?11.1; 3.1 ± 15.4, P < 0.001). Surprisingly, unridden domestic horses showed greater angles than feral horses or domestic horses at liberty. We compared adult and juvenile horses in all 3 gaits and found no significant difference. Taken together, these findings demonstrate that the longitudinal neck flexion of the degree desirable by popular opinion in ridden horses is not a common feature of unridden horses moving naturally. Moreover, they suggest that advertised horses in our series are generally being ridden at odds with their natural carriage and contrary to the international rules of dressage (as published by the International Equestrian Federation). These findings are discussed against the backdrop of the established doctrine, which states that carrying a rider necessitates changes in longitudinal flexion, and in the context of the current debate around hyperflexion. |
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Elsevier |
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1558-7878 |
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| Notes |
doi: 10.1016/j.jveb.2010.03.004 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
6501 |
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| Author |
Mungall Ec, |
| Title |
Habitat preferences of Africa's recent equidae, with special reference to the extinct quagga |
Type |
Journal Article |
| Year |
1979 |
Publication |
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Abbreviated Journal |
Symposium on the Ecology and Behavior of wild and feral Equids, Laramie |
| Volume |
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Issue |
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Pages |
159-172 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
| Call Number |
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Serial |
1411 |
| Permanent link to this record |
