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Equine and Animal Cognition Reference Database

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Author Sugiyama Y; Koman J; Bhoye Show M openurl 
  Title Ant-catching wands of wild chimpanzees at Bossou, Guinea Type Journal Article
  Year 1988 Publication Folia Primatol. Abbreviated Journal  
  Volume 51 Issue Pages 56  
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  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 3042  
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Author Wimmer H; Hogrefe GJ; Perner J openurl 
  Title Children's understanding of informational access as a source of knowledge Type Journal Article
  Year 1988 Publication Child Dev. Abbreviated Journal  
  Volume 59 Issue Pages 386  
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  Call Number Equine Behaviour @ team @ Serial 3050  
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Author Steinhoff, H.J. openurl 
  Title A continuous wave laser T-jump apparatus and its application to chemical reactions in hemoglobin single crystals Type Journal Article
  Year 1988 Publication Journal of Biochemical and Biophysical Methods Abbreviated Journal J Biochem Biophys Methods  
  Volume 15 Issue 6 Pages 319-330  
  Keywords Animals; Chemistry; Crystallization; *Heat; *Hemoglobins; Horses/blood; *Lasers; Methemoglobin; Solutions; Thermodynamics; Thiocyanates  
  Abstract A laser temperature jump apparatus is constructed where the T-jump is achieved by means of the direct absorption of continuous laser radiation of low intensity by a solid sample. The final temperature in the irradiated volume element is reached when the absorbed radiation power equals the dissipation of heat by heat conduction. The time range from the beginning of irradiation to the stationary state depends on the geometry of the irradiated volume element and is less than 10 ms. The heating laser beam is simultaneously used to detect the relaxation to the new chemical equilibrium in the sample. Relaxation processes with relaxation rates between 10(2) s-1 and less than 10(-3) s-1 on samples with volumes less than 10(-3) mm3 may be investigated using this T-jump method. One application of this method is the determination of reaction rates of ligand reactions in hemoglobin single crystals. Rate constants obtained for the reaction of thiocyanate with crystallized horse methemoglobin are presented.  
  Address Institut fur Biophysik, Ruhr-Universitat Bochum, F.R.G  
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  ISSN 0165-022X ISBN Medium  
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  Notes PMID:3379245 Approved no  
  Call Number Equine Behaviour @ team @ Serial 3804  
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Author Mackintosh, N.J. openurl 
  Title Approaches to the study of animal intelligence Type Journal Article
  Year 1988 Publication British Journal of Psychology Abbreviated Journal  
  Volume 79 Issue 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 Fuller, T.K.; Sampson, B.A. openurl 
  Title Evaluation of a simulated howling survey for wolves Type Journal Article
  Year 1988 Publication J Widl Manag Abbreviated Journal  
  Volume 52 Issue Pages  
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  Notes Approved no  
  Call Number Equine Behaviour @ team @ Fuller1988 Serial 6458  
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Author Kirkpatrick, J. F.; Kasman, L. H.; Lasley,; B. L.; Turner, J. W. Jr. doi  openurl
  Title Pregnancy Determination in Uncaptured Feral Horses Type Journal Article
  Year 1988 Publication Journal of Wildlife Management Abbreviated Journal J Wildl Manag  
  Volume 52 Issue 2 Pages 305-308  
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  Abstract The urinary excretion of estrone sulfate ($\text{E}{1}\text{S}$) by 25 free-roaming feral horses (Equus caballus) was measured by radioimmunoassay applied to extracts of urine-soaked soil. Twelve of 15 mares having $\text{E}{1}\text{S}$ concentrations >1.0 mg/mg creatinine (x = 2.64 +- 1.02 [SD]) produced foals. All 10 mares with $\text{E}{1}\text{S}$ concentrations <1.0 mg/mg creatinine (x = 0.44 +- 0.26) did not foal. Extracting urine from soil and measuring $\text{E}{1}\text{S}$ and creatinine can be used to determine pregnancy in free-roaming feral horses without the stress of capture or immobilization.  
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  Call Number Equine Behaviour @ team @ Serial 2290  
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Author Berger, J.; Cunningham, C. doi  openurl
  Title Size-Related Effects on Search Times in North American Grassland Female Ungulates Type Journal Article
  Year 1988 Publication Ecology Abbreviated Journal  
  Volume 69 Issue 1 Pages 177-183  
  Keywords no keywords available  
  Abstract Feeding and searching (&#61; vigilance) rates arise as a result of many interrelated factors including trophic level, diet, reproductive condition, sex, habitat, body mass, and potential predation pressure. Because of unique ecological conditions in which the confounding influences of all but two of these variables could be minimized, we examined the hypothesis that body mass alone accounts for interspecific differences in search times, and tested it with females of four sympatric native North American ungulates (Bison bison, Antilocapra americana, Ovis canadensis, and Odocoileus hemionus). When the effects of group size were controlled, smaller bodied species were more vigilant (per unit body mass) than larger ones. However, search times (ST) also scaled to body mass, and between 81 and 97&#37; of the ST variance was explained by either exponential or power functions. To remove the potential bias that predators exert different influences on species of varying size, search times of bison in areas with and without their major predator, wolves (Canis lupus), were contrasted; search times did not differ between sites. Our results highlight the importance of designing field research that controls for confounding variables prior to attempting to scale behavioral processes to ecological events. See full-text article at JSTOR  
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  Publisher Ecological Society of America Place of Publication Editor  
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  ISSN 0012-9658 ISBN Medium  
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  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 2233  
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Author Westlin-van Aarde, L.M.; van Aarde, R. J.; Skinner, J. D. doi  openurl
  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 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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  Notes from Professor Hans Klingels Equine Reference List Approved yes  
  Call Number Serial 1705  
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Author Penzhorn, B. L.; van der Merwe, N. J. doi  openurl
  Title Testis size and onset of spermatogenesis in Cape mountain zebras (Equus zebra zebra) Type Journal Article
  Year 1988 Publication Journal of Reproduction and Fertility Abbreviated Journal J Reprod Fert  
  Volume 83 Issue Pages 371-375  
  Keywords mountain zebra; testis size; spermatogenesis  
  Abstract Testis mass of adult Cape mountain zebra stallions (mean 70·0 g) was appreciably less than that of other zebra species and domestic horses. The histological appearance of the testes of 11-, 24- and 29-month-old colts was typically prepubertal. Spermatogenic activity of a 4-year-old stallion obtained at the end of summer was at a very low level, while a 4·5-year-old stallion obtained 6 weeks after the winter solstice showed a marked increase in spermatogenesis compared with the 4-year-old. Stallions 6·5-19 years of age collected in different seasons all showed active spermatogenesis.  
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  Notes from Professor Hans Klingels Equine Reference List Approved yes  
  Call Number Serial 1463  
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Author Schilder, M.B.H. doi  openurl
  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  
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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  
  Call Number Serial 1564  
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