| Records |
| Author |
Schilder, M.B.H. |
| Title |
Dominance relationships between adult Plains zebra stallions in semi – captivity |
Type |
Journal Article |
| Year |
1988 |
Publication |
Behaviour |
Abbreviated Journal |
Behaviour |
| Volume |
104 |
Issue |
3-4 |
Pages |
300-319 |
| Keywords |
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| Abstract |
The relationships between 4-5 adult zebra stallions, living in a safari park, were investigated over a period of 5 years. Asymmetries in the distributions of a number of behaviours could be explained by adopting dominance as an intervening variable. Dominance in stallions was of a bipolar nature with on the one hand behaviours representing subordinance and defence, and on the other hand behaviours reinforcing and confirming dominance. Expression of formal dominance seems to play a minor role. The dyadic relationships of stallions differed as to the number of behaviours reflecting dominance relationships. Although often linear rank-orders could be constructed, these rank-orders were not necessarily identical. This means that the concept of dominance is of only limited value for describing relationships between zebra stallions. |
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Notes  |
from Professor Hans Klingels Equine Reference List |
Approved |
yes |
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Serial |
1564 |
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| Author |
Smielowski, J. |
| Title |
Breeding of the Grevy's Zebra at Polish zoological gardens |
Type |
Journal Article |
| Year |
1988 |
Publication |
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Abbreviated Journal |
Przeglad Zool |
| Volume |
32 |
Issue |
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Pages |
595-597 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
yes |
| Call Number |
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Serial |
1608 |
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| Author |
Smuts, M.M.S.; Penzhorn, B. L. |
| Title |
Descriptions of antomical differences between skulls and mandibles of Equus zebra and E. burchelli from southern Africa |
Type |
Journal Article |
| Year |
1988 |
Publication |
South African Journal of Zoology |
Abbreviated Journal |
South African Journal of Zoology |
| Volume |
23 |
Issue |
(4)3 |
Pages |
328-336 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
yes |
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Serial |
1617 |
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| Author |
Thackeray, J.F. |
| Title |
Zebras from wonderwerk cave, northern Cape province, South Africa: attempts to distinguish Equus burchelli and E. quagga |
Type |
Journal Article |
| Year |
1988 |
Publication |
South African journal of science |
Abbreviated Journal |
Suid- Afrikaanse Tydsskrif vir Wetenskap |
| Volume |
84 |
Issue |
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Pages |
99-101 |
| Keywords |
Cape Province; Teeth; Statistical analysis; Equidae; Hippomorpha; South Africa; Southern Africa; Perissodactyla; Mammalia; Vertebrata |
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0038-2353 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
yes |
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Serial |
1644 |
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| Author |
Westlin-van Aarde, L.M.; van Aarde, R. J.; Skinner, J. D. |
| Title |
Reproduction in female Hartmann's zebra |
Type |
Journal Article |
| Year |
1988 |
Publication |
Journal of Reproduction and Fertility |
Abbreviated Journal |
J Reprod Fert |
| Volume |
84 |
Issue |
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Pages |
505-511 |
| Keywords |
zebra; reproduction; ovaries; seasonality; progesterone |
| Abstract |
Ovaries, fetuses and plasma were collected from zebra mares shot in the Etosha National Park in Namibia between 15 and 25 August 1983. Ovarian weight was affected by reproductive status and most of the non-pregnant mares were anoestrous. The number of follicles varied between individuals and only pro-oestrous/oestrous mares had follicles larger than 20 mm in diameter. The largest follicle in pregnant mares was only 9 mm in diameter. Corpora lutea and corpora albicantia were found in non-pregnant as well as pregnant mares: 4 pregnant mares had only corpora albicantia. The presence of secondary corpora lutea could not be confirmed in any of the pregnant mares. Implantation was estimated to occur at around 73 days of gestation, and most mares (84%) had conceived between November and April. Peripheral concentrations of plasma progesterone during pregnancy varied from 0·5 to 2·4 ng/ml. |
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from Professor Hans Klingels Equine Reference List |
Approved |
yes |
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Serial |
1705 |
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| Author |
Mackintosh, N.J. |
| Title |
Approaches to the study of animal intelligence |
Type |
Journal Article |
| Year |
1988 |
Publication |
British Journal of Psychology |
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79 |
Issue |
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Pages |
509-525 |
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| Notes |
Cited By (since 1996): 17; Export Date: 24 October 2008 |
Approved |
no |
| Call Number |
Admin @ knut @ |
Serial |
4607 |
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| Author |
Bednarz, J.C. |
| Title |
Cooperative Hunting Harris' Hawks (Parabuteo unicinctus) |
Type |
Journal Article |
| Year |
1988 |
Publication |
Science |
Abbreviated Journal |
Science |
| Volume |
239 |
Issue |
4847 |
Pages |
1525-1527 |
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| Abstract |
Coordinated hunting by several individuals directed toward the capture and sharing of one Large prey animal has been documented convincingly only for a few mammalian carnivores. In New Mexico, Harris' hawks formed hunting parties of two to six individuals in the nonbreeding season. This behavior improved capture success and the average energy available per individual enabled hawks to dispatch prey larger than themselves. These patterns suggest that cooperation is important to understanding the evolution of complex social behavior in higher vertebrates and, specifically, that benefits derived from team hunting a key factor in the social living of Harris' hawks. |
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| Notes |
10.1126/science.239.4847.1525 |
Approved |
no |
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Equine Behaviour @ team @ |
Serial |
4717 |
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| Author |
Leonard, M.L.; Horn, A.G.; Eden, S.F. |
| Title |
Parent-offspring aggression in moorhens |
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Journal Article |
| Year |
1988 |
Publication |
Behav. Ecol. Sociobiol. |
Abbreviated Journal |
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23 |
Issue |
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Pages |
265-270 |
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| Abstract |
The purpose of this study was to explain parental aggression to offspring in the moorhen (Gallinula chloropus). Males and females did not feed different subsets of chicks. In addition, there was a positive correlation between feeding rates of each parent to a particular chick and the number of attacks (tousles) directed to that chick, contrary to what was expected if aggression served to divide the brood. In moorhens, large chicks outcompeted small chicks for parental feedings. However, adults were more aggressive to large chicks and as a result small chicks spent significantly more time closer to parents and received more feedings than large chicks. In 84% of broods every chick was attacked at least once, although large chicks were attacked more often than small chicks. The behaviour of chicks changed immediately after an attack (Table 2). Before an attack chicks were <1 m from the parents while after an attack they were >1 m. The apparent effect of parental aggression in moorhens is to reduce demands by chicks for feedings. Aggression appears to reduce sibling competition and to encourage chick independence. |
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| Notes |
10.1007/Bf00302949 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
4905 |
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| Author |
Clutton-Brock, T.H.; Green, D.; Hiraiwa-Hasegawa, M.; Albon, S.D. |
| Title |
Passing the buck: resource defence, lek breeding and mate choice in fallow deer |
Type |
Journal Article |
| Year |
1988 |
Publication |
Behav. Ecol. Sociobiol. |
Abbreviated Journal |
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23 |
Issue |
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Pages |
281-296 |
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lsquoLekrsquo breeding systems, where males defend small, clustered mating territories, are thought to occur where the distribution of females is heavily clumped but males are unable to defend resources used by females. In this paper, we describe a breeding system in fallow deer where males are able to defend resources used by females but the most successful bucks instead defend small territories on a traditional mating ground; where the lek is sited in an area not heavily used by females at other times of year and is visited primarily by females in or close to oestrus; and where mating success on the lek is related to territory position and to male phenotype but not to the resources available on different lek territories. Comparisons with other ungulates suggest that lek breeding species fall into two groups: those where leks are regularly visited by herds of females many of which are not in oestrus and those, like fallow deer, where leks are visited primarily by oestrous females. In the latter species, it is unlikely that females visit the lek for ecological reasons. |
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10.1007/Bf00300575 |
Approved |
no |
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Equine Behaviour @ team @ |
Serial |
4882 |
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| Author |
Marinier, S.L.; Alexander, A.J.; Waring, G.H. |
| Title |
Flehmen behaviour in the domestic horse: Discrimination of conspecific odours |
Type |
Journal Article |
| Year |
1988 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
| Volume |
19 |
Issue |
3-4 |
Pages |
227-237 |
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American Saddlebred horses were used to test the responses of domestic horses to the odours of conspecifics. In all cases the odours were tested in the absence of the donor animal. Thus the test animal's behavioural responses were concentrated on the olfactory stimuli, and possible interference from donor behaviour was eliminated. Stallions were significantly more responsive than mares and geldings. This was shown in both flehmen and sniffing behaviour to urine/vaginal secretions and in sniffing behaviour to faecal samples. Only stallions were used for subsequent tests. Stallions showed no significant differences in response to the odour of urine/vaginal secretions of an oestrus mare from that when she was not in season. Parameters used for analysis of data were frequency, latency and duration of flehmen as well as duration of responsiveness to samples. In testing for differences in odours between individual mares, two methods were used. The stallions differentiated between samples from individual mares. In some cases this differentiation was exhibited when the stallions were merely presented with the two samples in sequence. In other cases statistically significant differences in response to the odours were shown only by simultaneous presentation of the two samples to the test stallion. Parameters used for data analysis were frequency and duration of flehmen and duration of responsiveness. |
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no |
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refbase @ user @ |
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507 |
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