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Author Yamakoshi G; Sugiyama Y
Title Pestle-pounding behavior of wild chimpanzees at Bossou, Guinea: a newly observed tool-using behavior Type Journal Article
Year (up) 1995 Publication Primates Abbreviated Journal Primates
Volume 36 Issue Pages 489
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Call Number Equine Behaviour @ team @ Serial 3052
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Author Visalberghi E; Fragaszy DM; Savage-Rumbaugh ES
Title Performance in a tool-using task by common chimpanzees (Pan troglodytes), bonobos (Pan paniscus), an orangutan (Pongo pygmaeus), and capuchin monkeys (Cebus apella) Type Journal Article
Year (up) 1995 Publication J. Comp. Psychol. Abbreviated Journal
Volume 109 Issue Pages 52
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Call Number Equine Behaviour @ team @ Serial 3077
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Author Anderson B.
Title Dendrites and cognition: A negative pilot study in the rat Type Journal Article
Year (up) 1995 Publication Intelligence Abbreviated Journal
Volume 20 Issue Pages 291-308
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Call Number refbase @ user @ Serial 3453
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Author Gärdenfors P.
Title Cued and detached representations in animal cognition Type Journal Article
Year (up) 1995 Publication Behavioural Processes Abbreviated Journal Behav. Process.
Volume 35 Issue Pages 263-273
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Call Number refbase @ user @ Serial 3454
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Author Beer C.G.
Title Trial and error in the evolution of cognition Type Journal Article
Year (up) 1995 Publication Behavioural Processes Abbreviated Journal Behav. Process.
Volume 35 Issue Pages 215-224
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Call Number refbase @ user @ Serial 3455
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Author Laughlin N.K.; Lasky R.E.; Luck M.L.; Kluender K.R.; Hecox K.E.
Title Early lead exposure alters behavioral and electrophysiological indices of auditory processing in the rhesus monkey Type Journal Article
Year (up) 1995 Publication Neurotoxicology and Teratology Abbreviated Journal
Volume 17 Issue Pages 374-374
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Call Number refbase @ user @ Serial 3456
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Author Houpt, K.A.
Title Learning in horses. Type Book Chapter
Year (up) 1995 Publication The thinking horse. Abbreviated Journal
Volume Issue Pages 12-17
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Publisher Equine Research Centre Place of Publication Guelph, Canada Editor
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Call Number Equine Behaviour @ team @ Serial 3585
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Author Robinson, T.A.; Foster, T.M.; Temple, W.; Poling, A.
Title Performance of domestic hens under progressive-ratio schedules of food delivery Type Journal Article
Year (up) 1995 Publication Behavioural Processes Abbreviated Journal Behav. Process.
Volume 34 Issue 3 Pages 233-239
Keywords Progressive-ratio schedule; Domestic hen; Behavioral economics; Satiation
Abstract Domestic hens were exposed to progressive-ratio 2 and progressive-ratio 10 schedules of food delivery with different initial ratios (2, 10, 20, 30, and 40). Breaking points, defined as the largest ratios completed before responding ceased for 600 consecutive seconds, were recorded under all conditions. In general, breaking points were higher under the PR 10 schedule than under the PR 2 schedule, and the value of the initial ratio did not systematically affect the breaking point. The former finding suggests that relative satiation affected breaking points in the present study, but the latter finding suggests that the primary determinant was the `price' of the reinforcer, defined in terms of the number of responses required to produce it. Breaking points were similar under conditions where initial ratios changed from session to session and under more conventional conditions, where initial ratios remained unchanged over several sessions.
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Call Number Equine Behaviour @ team @ Serial 3605
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Author Marinier, S.L.; Alexander, A.J.
Title Coprophagy as an avenue for foals of the domestic horse to learn food preferences from their dams Type Journal Article
Year (up) 1995 Publication Journal of Theoretical Biology Abbreviated Journal J. Theor. Biol.
Volume 173 Issue 2 Pages 121-124
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Abstract Observation of foal development shows that the appearance of adult-type motor grazing behaviour, selection of grass vs. non-grass and the avoidance of poisonous plants occur concurrently between the ages of 4 and 6 weeks. Suckling behaviour and close association of foal with dam change with time but show no particular coincidence with grazing behavioural changes. Coprophagy of the foal on maternal faeces does, however, correspond chronologically with the foal learning to graze selectively. This correspondence suggests that, as well as other uses, in domestic horses coprophagy may function to imprint on the foal the food-selective values of its dam.
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Call Number Equine Behaviour @ team @ Serial 3626
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Author i Rios, J.F.; Houpt, K.
Title Sexual behavior in geldings Type Journal Article
Year (up) 1995 Publication Applied Animal Behaviour Science Abbreviated Journal Appl. Anim. Behav. Sci.
Volume 46 Issue 1-2 Pages 133-135
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Abstract Abstract

In response to a request published in Equus, a magazine for those interested in horses, 85 owners of older geldings exhibiting sexual behavior completed history forms. The mean age of geldings was 16 f 5 years. Only 39 of the owners had had the gelding for at least a year before the behavior was noted. These cases could be used to determine the true age of onset of the problem. When log survivorship was used to determine whether there were one or two different populations, a break or change in the slope at age 16 indicated that there are two populations. One population shows the behavior from the time of castration and the other first exhibits the behavior in old age, possibly in response to an ACTH secreting pituitary adenoma. A total of 40% of the horses were Quarterhorses, the most numerous breed in the US; 78% of the horses were purebreds. Fewer than half the owners knew the age at which their horse had been castrated because they did not own the horse at the time.

The mean age at castration, when known, was 3.3 f 2.5 years. The reason for contacting us was sexual behavior (70%), aggression (24%). or some other problem ( 1 o/o). Whether or not aggression was the presenting problem, most of the horses showed aggression (95%), particularly towards other geldings (88%)) but also towards people (3 1%). Copulatory behavior (mounting) was shown by 69% of the geldings and half of those were able to intromit. These findings indicate that the sexual behavior of geldings is a problem for owners and that aggression usually accompanies sexual behavior.

The owners were encouraged to send serum samples taken before and after human chorionic gonadotropin (HCG) administration for testosterone and estrone sulfate analysis to determine whether residual testicular tissue was responsible for the horse’s behavior. Of the 14 horses tested, only one had elevated levels of testosterone indicating that there was residual testicular tissue. A total of six of the owners agreed to treat their horses with cyproheptadine at a dose of 8 mg day- ’ gradually increased to 88 mg day- ’ per horse. A total of three of the horses showed a decline in sexual and aggressive behavior, one got worse and two had side effects and treatment was withdrawn.
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Call Number Equine Behaviour @ team @ Serial 3627
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