| Records |
| Author |
Wimmer H; Hogrefe GJ; Perner J |
| Title |
Children's understanding of informational access as a source of knowledge |
Type |
Journal Article |
| Year |
1988 |
Publication |
Child Dev. |
Abbreviated Journal |
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| Volume |
59 |
Issue |
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Pages  |
386 |
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no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
3050 |
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| Author |
Penzhorn, B. L.; van der Merwe, N. J. |
| 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 |
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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 |
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Serial |
1463 |
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| Author |
Brennan, J.; Anderson, J. |
| Title |
Varying responses to feeding competition in a group of rhesus monkeys (Macaca mulatta) |
Type |
Journal Article |
| Year |
1988 |
Publication |
Primates |
Abbreviated Journal |
Primates |
| Volume |
29 |
Issue |
3 |
Pages |
353-360 |
| Keywords |
Macaca mulatta – Dominance – Feeding – Agonistic behaviour – Snakes |
| Abstract |
The behaviour of members of a group of rhesus monkeys was observed in experimentally created, competitive feeding situations. Socially dominant members of the group tended to start eating before lower-ranking subjects, and generally ate more. Dominants sometimes used aggression to control access to food, but overall, intermediate-ranking monkeys were involved in most agonistic episodes. Non-dominant subjects improved their feeding performance when food was presented in three piles rather than one pile, often by snatching food and consuming it away from the pile. These general patterns were less evident when realistic snake models were placed on some of the food piles. Feeding was disrupted by the presence of snakes, but notably, subordinates risked feeding in these conditions. Piles containing preferred foods and snakes were eaten from, but a low-preference food (carrot) under snakes went untouched by all subjects. The results suggest that group-members evaluate potential risks and benefits of competing for a restricted resource, and that dominance status, while an important factor, is only one element in the equation. |
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no |
| Call Number |
refbase @ user @ |
Serial |
809 |
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| Author |
KOTERBA AM et al, |
| Title |
Brathing strategy of the adult horse at rest |
Type |
Journal Article |
| Year |
1988 |
Publication |
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Abbreviated Journal |
J Appl Physiol |
| Volume |
64 |
Issue |
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Pages |
337-346 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
| Call Number |
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Serial |
1327 |
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| Author |
Smuts, M.M.S.; Penzhorn, B. L. |
| Title |
Descriptions of antomical differences between skulls and mandibles of Equus zebra and E. burchelli from southern Africa |
Type |
Journal Article |
| Year |
1988 |
Publication |
South African Journal of Zoology |
Abbreviated Journal |
South African Journal of Zoology |
| Volume |
23 |
Issue |
(4)3 |
Pages |
328-336 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
yes |
| Call Number |
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Serial |
1617 |
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| Author |
Hauser M.D |
| Title |
Invention and social transmission: new data from wild vervet monkeys |
Type |
Book Chapter |
| Year |
1988 |
Publication |
Machiavellian Intelligence |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
327-343 |
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| Publisher |
Oxford Univ Press |
Place of Publication |
Oxford |
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ISBN |
0-19-852175-8 |
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no |
| Call Number |
Equine Behaviour @ team @ Byrne1988 |
Serial |
4794 |
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| Author |
Steinhoff, H.J. |
| 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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English |
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0165-022X |
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| Notes |
PMID:3379245 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
3804 |
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| Author |
Geyer Cj, T.E. |
| Title |
Gene survival in the Asian wild horse: I. Dependence of gene survival in the Calgary breeding group pedigree |
Type |
Journal Article |
| Year |
1988 |
Publication |
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Abbreviated Journal |
Zoo Biol |
| Volume |
7 |
Issue |
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Pages |
313-327 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
| Call Number |
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Serial |
1107 |
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| Author |
Kirkpatrick, J. F.; Kasman, L. H.; Lasley,; B. L.; Turner, J. W. Jr. |
| 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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no |
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Equine Behaviour @ team @ |
Serial |
2290 |
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| Author |
Schilder, M.B.H. |
| 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 |
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Serial |
1564 |
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