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Author |
Giebel, H.D. |
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Title |
Visuelles lernvermögen bei Einhufern |
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1958 |
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Horse Behavior, 1983 |
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Zool. Jahrb. 67 |
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229-231 |
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Cited By (since 1996): 1; Export Date: 24 October 2008 |
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Admin @ knut @ |
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4588 |
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Author |
Grzimek, B. |
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Title |
On the Psychology of the Horse |
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Journal Article |
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1968 |
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Man and Animal: Studies in Behavior |
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37-46 |
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Cited By (since 1996): 4; Export Date: 24 October 2008 |
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4592 |
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Author |
Asa, C.S.; Goldfoot, D.A.; Garcia, M.C.; Ginther, O.J. |
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Title |
Dexamethasone suppression of sexual behavior in the ovariectomized mare |
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Journal Article |
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Year |
1980 |
Publication |
Hormones and Behavior |
Abbreviated Journal |
Horm Behav |
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14 |
Issue |
1 |
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55-64 |
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The influence of steroids of adrenal cortical origin on estrous behavior in the ovariectomized mare was evaluated by adrenal suppression via dexamethasone (DEX) administration in two experiments. In Experiment I, 12 mares (six DEX, six control) were tested for sexual behavior in harem groups (two DEX and two control mares plus one stallion per group) for 9 consecutive days. In Experiment II, estradiol (E2) was given to a group of DEX-treated mares as an additional control. Twelve mares (four DEX, four DEX + E2, and four control) were tested in harem groups (one DEX, one DEX + E2, and one control mare plus one stallion per group) for 10 days. All DEX mares showed a clear suppression of sexual response compared to control or DEX + E2 mares, indicating that the estrous behavior seen in ovariectomized mares may be due to steroids from the adrenal cortex. The control and DEX + E2 mares were similar in all measures of proceptivity. Despite being more receptive, as indicated by fewer negative responses, the DEX + E2 mares received fewer intromissions and ejaculations than did the control animals. The ability of estradiol to induce estrous behavior in the dexamethasone-suppressed mare notwithstanding, other adrenal steroids, e.g., androgens, may be involved in estrous behavior in the untreated, ovariectomized mare. |
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0018-506x |
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Equine Behaviour @ team @ |
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5360 |
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Asa, C.S.; Goldfoot, D.A.; Ginther, O.J. |
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Title |
Sociosexual behavior and the ovulatory cycle of ponies (Equus caballus) observed in harem groups |
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Journal Article |
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Year |
1979 |
Publication |
Hormones and Behavior |
Abbreviated Journal |
Horm Behav |
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13 |
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1 |
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49-65 |
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Observations of sociosexual behavior of adult ponies, made on two harem groups (each comprised of one vasectomized male and three females), were correlated with follicular development and ovulation for a total of 15 cycles (minimum of 2 cycles per female). Mean cycle length (interovulatory interval) was found to be 19.7 days, with behavioral estrus lasting 7-8 days (5.5 days preovulatory; 2.3 days postovulatory). Estrous females typically showed increased frequencies of approaching and following the stallion, urinating, presenting, clitoral winking, and tail raising. Approaching and following the stallion appeared earlier and persisted longer than other estrous responses. Deviations from the modal estrous pattern included cycles with subestrus, continual estrus, behavioral estrus in the absence of ovulation, and displays of female mounting. Dominance tests revealed that a mare's status was unaffected by the phases of the estrous cycle. The presence of more than one estrous female affected the copulatory performance of both stallions, most notably in reduced latencies to first mount, intromission, and ejaculation, in spite of differences between the stallions in sexual vigor. Each stallion usually selected the dominant mare for copulation when there were multiple estrous females present, but mounts were not displayed exclusively to one female per test. The social testing situation made apparent the importance of use of space in sociosexual communication in this species, particularly in avoidance of the stallion by diestrous mares and standing alone or in proximity to him by estrous mares. |
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0018-506x |
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Equine Behaviour @ team @ |
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5363 |
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Author |
Dugatkin, L.A. |
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Title |
Dynamics of the TIT FOR TAT strategy during predator inspection in the guppy (Poecilia reticulata) |
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Journal Article |
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Year |
1991 |
Publication |
Behavioral Ecology and Sociobiology |
Abbreviated Journal |
Behav. Ecol. Sociobiol. |
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29 |
Issue |
2 |
Pages |
127-132 |
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One well-known solution to the iterated Prisoner's Dilemma is the TIT FOR TAT strategy. This strategy has three “characteristics” associated with it. TIT FOR TAT is nice (cooperates on the first move of a game), retaliatory (plays defect against an individual that defected on the prior move), and forgiving (cooperates with an individual which has defected in the past but cooperates in the present). Predator inspection behavior in guppies (Poecilia reticulata) was examined in order to determine whether guppies displayed these three characteristics. Results indicate that while it can be quite difficult to translate the abstract concepts of niceness, retaliation, and forgiveness into measurable behaviors, the data support the hypothesis that guppies display the three characteristics associated with the TIT FOR TAT strategy. |
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Call Number |
Equine Behaviour @ team @ |
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2178 |
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Author |
Dugatkin, L.A.; Godin, J.-G.J. |
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Title |
Female mate copying in the guppy (Poecilia reticulata): age-dependent effects |
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Journal Article |
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Year |
1993 |
Publication |
Behavioral Ecology |
Abbreviated Journal |
Behav. Ecol. |
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4 |
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4 |
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289-292 |
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mate choice, copying, guppy, Poecilia reticulata |
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Virtually all studies of mate choice to date have assumed that females choose mates independent of one another. Social cues, however, such as the mate choice of conspecifics, may also play an important role in such decisions. Previous work has shown that female guppies of similar age copy each other's choice of mates. Here we examine the effect of relative age on mate choice copying in the guppy, Poecilia reticulata, and examine whether younger individuals are more likely to copy the mate choice of older conspecifics than vice versa. Results indicate that younger females copy the mate choice of older females, but older individuals do not appear to be influenced by the mate choice of younger individuals. |
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Equine Behaviour @ team @ |
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2181 |
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Author |
Wittig, R.M.; Boesch, C. |
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Title |
“Decision-making” in conflicts of wild chimpanzees (Pan troglodytes): an extension of the Relational Model |
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Journal Article |
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2003 |
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Behavioral Ecology and Sociobiology |
Abbreviated Journal |
Behav. Ecol. Sociobiol. |
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54 |
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5 |
Pages |
491-504 |
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>We examined the “decision-making” process of aggressive interactions within a community of wild chimpanzees ( Pan troglodytes verus) in the Taï National Park, Côte d’Ivoire (West Africa). Costs and benefits were investigated for 876 dyadic aggressive interactions among 18 adults (including 4 independent adolescents) of either sex. An extended version of the Relational Model was developed to describe the dynamics of the “decision-making” process in Taï chimpanzees, which suggests that the net benefit determines the occurrence of conflicts. Both sexes fought more frequently for the resources that were most important to them, food for females and social contexts for males. Individuals used two different strategies according to their likelihood of winning the aggressive interaction, determined by the dominance relationship of the conflict partners. Dominant initiators had longer and more intense aggressive interactions, but they limited their social disadvantages by fighting non-cooperative partners. Subordinate initiators had shorter and less intense aggressive interactions, but risked more social costs, which they could reduce afterwards by reconciliation. Both strategies included a positive overall net benefit. The extended Relational Model fits the complexity of wild chimpanzee conflicts and allows for more flexibility in the “decision-making” compared to the original version. |
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Equine Behaviour @ team @ |
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2206 |
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Author |
Berger, J, |
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Title |
Social systems, resources, and phylogenetic inertia: an experimental test and its limitations |
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1988 |
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Ecology of Social Behavior |
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157-186 |
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Academic Press |
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San Diego |
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Slobochikoff, C.N. |
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Ecology of Social Behavior |
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Equine Behaviour @ team @ |
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2234 |
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Author |
Kirkpatrick, J.F.; Turner, J.W. |
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Changes in herd stallions among feral horse bands and the absence of forced copulation and induced abortion |
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1991 |
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Behavioral Ecology and Sociobiology |
Abbreviated Journal |
Behav. Ecol. Sociobiol. |
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29 |
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3 |
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217-219 |
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Forced copulation and induced abortion were investigated in a herd of feral horses inhabiting a coastal barrier island. Eight mares were diagnosed pregnant in August and October 1989 by means of urinary and fecal steroid metabolites, prior to documented changes in herd stallions. These mares were observed for harassment and forced copulation by the new stallions and for the presence of foals during the spring and summer of 1990. No incidents of harassment or attempts at forced copulation were witnessed and seven of the eight mares produced foals in 1990. These data indicate that forced copulation and induced abortion are not common events among all feral horse herds and suggest reinvestigation of this hypothesized phenomenon. |
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Equine Behaviour @ team @ |
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2327 |
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Mayes, E.; Duncan, P. |
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Title |
Temporal patterns of feeding behaviour in free-ranging horses |
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1986 |
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Behavior |
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Behav. |
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96 |
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105-129 |
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Equine Behaviour @ team @ |
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2351 |
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