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Ödberg Fo,. (1976). A study on eliminative and grazing behaviour – the use of the field by captive horses. Equine Vet J, 8, 147–149.
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Ziegler, W. H. (1976). [Endocrinological studies in arterial hypertension. Search for phaeochromocytoma]. Schweiz Med Wochenschr, 106(34), 1148–1150.
Abstract: Elevated urinary catecholamines and their metabolites are the only findings which confirm the presence of pheochromocytoma. This examination is of particular interest if carried out in urine produced after spontaneous hypertensive episodes. Pharmacologic tests when carried out under standard conditions have proven to be a reliable aid in cases of suspected pheochromocytoma. Roentgenographic studies, determination of local plasma catecholamine concentrations and blood volume control should be undertaken in these patients before surgical procedure.
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Zentall, S. S., & Zentall, T. R. (1976). Activity and task performance of hyperactive children as a function of environmental stimulation. J Consult Clin Psychol, 44(5), 693–697.
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Wüst G,. (1976). Geburt und perinatales Verhalten beim Steppenzebra. Zool. Garten., N.F. Jena 46, 305–352.
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Strayer, F. F. (1976). Learning and imitation as a function of social status in macaque monkeys (Macaca nemestrina). Anim. Behav., 24(4), 835–848.
Abstract: Learning and imitation were examined in animals selected from two groups of sixteen pigtail monkeys. There were significant differences in performance on a cued-alternation task as a function of both social status within the stable group, and prior exposure to a social model. High status animals responded more frequently, but were less successful in acquiring appropriate response delay. Exposure to the model improved response latencies and acquisition of response delay for all subjects. However, model exposure did not improve alternation performance. Results are discussed in terms of prior social experience of the subjects, general learning strategies, and differential sensitivity to multiple reinforcement contingencies. Findings are related to ethological concepts of imitation, and field reports on primate social learning.
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Smuts Gl,. (1976). Population characteristics of Burchell's Zebra in the Krüger National Park. S Afr J Wildl Res, 6, 99–112.
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Smuts Gl,. (1976). Reproduction in the zebra mare from Krüger National Park. Koedoe, 19, 89–132.
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Smuts Gl,. (1976). Reproduction in the zebra stallion from the Krüger National Park. Zool Afr, 11, 207–220.
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Smith, J. M., & Parker, G. A. (1976). The logic of asymmetric contests. Anim. Behav., 24(1), 159–175.
Abstract: A theoretical analysis is made of the evolution of behavioural strategies in contest situations. It is assumed that behaviour will evolve so as to maximize individual fitness. If so, a population will evolve an [`]evolutionarily stable strategy', or ESS, which can be defined as a strategy such that, if all members of a population adopt it, no [`]mutant' strategy can do better. A number of simple models of contest situations are analysed from this point of view. It is concluded that in [`]symmetric' contests the ESS is likely to be a [`]mixed' strategy; that is, either the population will be genetically polymorphic or individuals will be behaviourally variable. Most real contests are probably asymmetric, either in pay-off to the contestants, or in size or weapons, or in some [`]uncorrelated' fashion; i.e. in a fashion which does not substantially bias either the pay-offs or the likely outcome of an escalated contest. An example of an uncorrelated asymmetry is that between the [`]discoverer' of a resource and a [`]late-comer'. It is shown that the ESS in asymmetric contests will usually be to permit the asymmetric cue to settle the contest without escalation. Escalated contests will, however, occur if information to the contestants about the asymmetry is imperfect.
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Schoen Ams,. (1976). Behaviour of young shetland welsh ponies. Biol Behav, 1, 192–216.
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