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Author |
Penzhorn Bl, G.R. |
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Title |
Incisor wear in free – ranging Cape mountain zebras |
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Year |
1987 |
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S Afr J Wildl Res |
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17 |
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99-102 |
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Notes  |
from Professor Hans Klingels Equine Reference List |
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no |
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1461 |
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Author |
Penzhorn Bl, L.P. |
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Title |
Comparisons of reproductive parameters of two Cape mountain zebra populations |
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Journal Article |
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Year |
1987 |
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Abbreviated Journal |
J Reprod Fert Suppl |
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35 |
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661-663 |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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1462 |
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Author |
Schilder Mbh, B.P. |
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Title |
Ethological investigations on a herd of Plains Zebra in a safari park: Time – budgets, reproduction and food competition |
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Year |
1987 |
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App Anim Behav Sci |
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18 |
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45-56 |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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1568 |
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Author |
SUMMERS PM et al, |
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Title |
Sucessful transfer of the embryos of Przewalski's horses and Grant's zebra to domestic mares |
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Year |
1987 |
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J Reprod Fert |
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80 |
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13-20 |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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1638 |
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Author |
Rutberg, A.T. |
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Title |
Horse Fly Harassment and the Social Behavior of Feral Ponies |
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Journal Article |
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Year |
1987 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
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Volume |
75 |
Issue |
2 |
Pages |
145-154 |
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Abstract Horse flies (Tabanidae) on and around feral ponies in harem groups were counted at Assateague Island National Seashore, Maryland, U.S.A., between June and August 1985. Harem stallions attracted the most flies; adult mares showed intermediate fly numbers, while few flies landed on foals under any circumstances. The use of thermal and chemical cues by flies selecting a host may have helped create this disparity. When flies were abundant, ponies reduced spacing within the group. Ponies in larger groups suffered from fewer flies than ponies in smaller groups. There was, however, no evidence that ponies merged into larger groups in response to fly harassment, suggesting that biting flies play little role in structuring pony social organization. |
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Wiley/Blackwell (10.1111) |
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0179-1613 |
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doi: 10.1111/j.1439-0310.1987.tb00648.x |
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Call Number |
Equine Behaviour @ team @ |
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6417 |
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Author |
Creigier, S.E. |
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Title |
Trailer problems and solutions |
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Year |
1987 |
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Current Therapy in Equine Medicine |
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Cited By (since 1996): 1; Export Date: 24 October 2008 |
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Call Number |
Admin @ knut @ |
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4578 |
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Author |
Hunte, W.; Horrocks, J.A. |
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Title |
Kin and non-kin interventions in the aggressive disputes of vervet monkeys |
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Year |
1987 |
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Behav. Ecol. Sociobiol. |
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20 |
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257-263 |
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Abstract |
Interventions in aggressive disputes were investigated in a free-living troop of vervets (Cercopithecus aethiops sabaeus) in Barbados. Interventions on behalf of kin were more frequent than on behalf of non-kin. Both types of interventions were more likely when the intervening animal outranked the opponent; presumably because retaliation probability, and hence cost of intervening, is low against low ranking opponents. The number of interventions given on behalf of both kin and non-kin increased with the number of disputes in which they were involved. In contrast to kin interventions, the number of interventions given on behalf of non-kin was correlated with that received by non-kin, suggesting that reciprocation is a necessary component of non-kin interventions. Non-kin interventions were more likely when the recipient outranked the opponent, presumably because reciprocation probability is high. Pairs of non-kin form structured reciprocal relationships based on the proportion of interventions allocated to each other, and most non-kin interventions flowed through these relationships. Males intervened on behalf of non-kin more frequently than did females. The implications of the results for the evolution of kin and reciprocal altruism were discussed. |
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Notes |
10.1007/Bf00292178 |
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no |
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Call Number |
Equine Behaviour @ team @ |
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4927 |
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Author |
Ginsberg, J.R. |
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Title |
Social behavior and mating strategies of an arid adapted equid: the Grevy's zebra. |
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Year |
1987 |
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Prnceton |
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no |
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Equine Behaviour @ team @ |
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2295 |
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Author |
Sherwin, C.M.; Johnson, K.G. |
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Title |
The influence of social factors on the use of shade by sheep |
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Journal Article |
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Year |
1987 |
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Applied Animal Behaviour Science |
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Appl. Anim. Behav. Sci. |
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18 |
Issue |
2 |
Pages |
143-155 |
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Individual differences in shading behaviour within a flock of sheep could be due to differences in thermoregulatory capabilities or to the influence of social factors. The possible influence of social factors on shade-use is examined in this paper. Two measures of dominance were made on 39 Merino wethers. These were based on the hierarchy determined by butting during feeding and on priority of access to limited feed. Leadership was also assessed while driving the sheep to a woolshed and as the sheep entered weighing scales. These behavioural traits were compared with leadership to shade and shade-use observed on 9 days during summer in a small pastureless enclosure containing natural shade. Maximum ambient temperature on these 9 days varied between 29.0 and 39.5[degree sign]C. All behavioural traits examined were significantly repeatable. The two dominance ranks were negatively correlated (P<0.05). The butting hierarchy was correlated with shading behaviour; those sheep that butted the larger proportion of the flock were seen to shade for longer periods of time (P=0.05). This relationship became more significant as environmental temperature increased. Significant (P<0.05) differences in the amount of time each sheep spent shading were evident throughout the flock, but in particular seven individuals shaded much less than others. Shade-use increased in hot weather and was slightly more strongly correlated with radiation load than with air temperature. The non-shading leadership ranks were related neither to each other nor to the leadership to shade. However, the sheep that moved to shade first remained there longest (P<0.05). Reduced motivation to feed did not appear to explain early movement to shade. Few overtly aggressive or other interactions between animals were seen to be associated with movements to or within shade. Nonetheless, the results indicate that social forces do exert some influence on shade-use. |
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Equine Behaviour @ team @ room B 3.029 |
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2037 |
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Author |
Kacelnik, A. |
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Title |
Information primacy or preference for familiar foraging techniques? A critique of Inglis & Ferguson |
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1987 |
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Animal Behaviour. |
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Anim. Behav. |
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35 |
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3 |
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925-926 |
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2121 |
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