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Author |
Parelli, P. |
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1993 |
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Natural Horsemanship |
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Cited By (since 1996): 5; Export Date: 21 October 2008 |
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Equine Behaviour @ team @ |
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4538 |
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Author |
de Waal, F.B.M. |
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Title |
Animal Social Conflict |
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Miscellaneous |
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1993 |
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Equine Behaviour @ team @ |
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4894 |
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Title |
Wolves in Europe: status and perspectives |
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1993 |
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Munich Wildlife Society |
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Ettal, Germany |
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Equine Behaviour @ team @ ref8 |
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6449 |
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Author |
Rutberg, A.T.; Keiper, R.R. |
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Title |
Proximate causes of natal dispersal in feral ponies: some sex differences |
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Journal Article |
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Year |
1993 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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Volume |
46 |
Issue |
5 |
Pages |
969-975 |
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Abstract. Fifteen years of data on natal dispersal age and the context of dispersal for the feral ponies of Assateague Island, Maryland are presented. Ninety-seven per cent of males and 81% of females dispersed from their natal groups by 5 years of age. For animals that left their natal group, average age of dispersal was 20[middle dot]8 months for males and 24[middle dot]6 months for females. Male dispersal age was strongly and significantly correlated with number of peers in the natal group, and males dispersing with peers were significantly older than males dispersing without peers, suggesting that males delayed dispersal when peers were available for interaction. Female dispersal age was not influenced by number of peers, but was correlated with age of first reproduction. Factors not influencing dispersal age in either sex were presence of a younger sibling, maternal band transfers, and maternal age and dominance rank. The relatively high frequency of females failing to disperse from their natal groups is puzzling in light of data showing diminished fecundity in non-dispersing pony mares. |
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refbase @ user @ |
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518 |
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Author |
SYLVAIN GAGNON,FRANCOISY. DORE |
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Title |
Search behavior of dogs (Canis familiaris) in invisible displacement problems |
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Journal Article |
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Year |
1993 |
Publication |
Animal Learning & Behavior |
Abbreviated Journal |
Anim Learn. & Behav. |
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21 |
Issue |
3 |
Pages |
246-254 |
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Gagnon and Dor (1992) showed that domestic dogs are able to solve a Piagetian object permanence
task called the invisible displacement problem. A toy is hidden in a container which is
moved behind a screen where the toy is removed and left. Dogs make more errors in these problems
than they do in visible displacement tests, in which the object is hidden directly behind
the target screen. In Experiment 1, we examinedcomponents ofthe standard procedure of invisible
displacements that may make encoding or retention of the hiding location more difficult than
it is in visible displacements. In Experiment 2, we compared dogs performances in visible and
invisible displacement problems when delays of 0, 10, and 20 sec were introduced between the
objects final disappearance and the subjects release. The results revealed that dogs poorer performance
in invisible displacement tests is related to the complex sequence of events that have
to be encoded or remembered as well as to a difficulty in representing the position change that
is signaled, but not directly perceived. |
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no |
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refbase @ user @ |
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538 |
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Author |
RÖHRS, M.; EBINGER, P. |
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Title |
Progressive und regressive Hirngrößenveränderungen bei Equiden |
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Journal Article |
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Year |
1993 |
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Abbreviated Journal |
Z zool Syst Evolut forsch |
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Volume |
31 |
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Pages |
233-239 |
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Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
yes |
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Serial |
1513 |
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Author |
Schuhmann K, |
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Title |
Untersuchung zur Sozialstruktur des persischen Wildesels |
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Manuscript |
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1993 |
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Doctoral thesis |
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Freiburg |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1578 |
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Author |
Shah Nv, |
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Title |
Ecology of wild ass in Little Rann of Kutch |
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Manuscript |
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Year |
1993 |
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Doctoral thesis |
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Baroda University, India. |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1587 |
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Author |
Goldschmidt, T.; Bakker, T.C.M.; Feuth-de Bruijn, E. |
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Title |
Selective copying in mate choice of female sticklebacks |
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Journal Article |
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Year |
1993 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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45 |
Issue |
3 |
Pages |
541-547 |
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Abstract |
There is evidence that female three-spined sticklebacks, Gasterosteus aculeatus L., prefer to mate with males whose nests contain eggs rather than with males with empty nests. While there is consensus on this point, a dispute exists about whether this preference should be attributed to a direct effect of the eggs on the female's entering the nest or, alternatively, to a positive impact of the eggs on the courtship behaviour and breeding coloration of the male. In the field experiment reported here females strongly preferred nests with eggs over empty nests. Additionally, females were less likely to enter risky nests with eggs: nests that contained fewer eggs than one average clutch or more eggs than the average nest content of parental males in this population. However, in the field possible differences in male attractiveness were not controlled for. In supplementary laboratory experiments the effect on female choice of possible changes in male attractiveness (intensified courtship and coloration) as a result of the presence of eggs in the nest was tested. Other differences in male attractiveness as a result of differences in male quality (body size, breeding coloration before the test, territory quality and size) were controlled for. When females had no access to the nests, they showed no preference for males with eggs in their nests in simultaneous choice tests. These results, together with the earlier published data, make it likely that the preference of females for nests with eggs is partly a direct consequence of the eggs themselves. So female sticklebacks are influenced by the mate choice behaviour of other females, but remain selective as to the actual nest content. |
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1818 |
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Author |
Feh, C.; de Mazières, J. |
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Title |
Grooming at a preferred site reduces heart rate in horses |
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1993 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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46 |
Issue |
6 |
Pages |
1191-1194 |
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Abstract. It is commonly suggested that the principal function of allogrooming is to reduce social tension between group members, but direct evidence of the physiological consequences of grooming at particular sites is lacking. By filming allogrooming sequences in a herd of Camargue horses, Equus caballus , their preferred grooming site, which lies on the lower neck, was identified. Experimental imitation of grooming at this site reduced the heart rate of the recipient while grooming on a non-preferred area did not, in both adults and foals. This preferred site lies close to a major ganglion of the autonomic nervous system. |
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2020 |
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