| Records |
| Author |
Zentall, T.R; Hogan, D.E. |
| Title |
Key pecking in pigeons produced by pairing keylight with inaccessible grain |
Type |
Journal Article |
| Year |
1975 |
Publication |
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Abbreviated Journal |
J Exp Anal Behav |
| Volume |
23 |
Issue |
2 |
Pages |
199-206 |
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| Abstract |
In Experiment I, keylight was paired with inaccessible grain delivery (under two conditions of keylight intensity) to determine if autoshaping would occur in the absence of primary reinforcement. In Experiment II, the procedure was repeated with accessible grain, for comparison. In Experiment III, the procedures were repeated with explicitly unpaired presentations of keylight and either inaccessible or accessible grain. The results indicated that key pecking occurred as quickly in the presence of keylight pairings with inaccessible grain as with accessible grain, though (except for one bird) key pecking was not maintained with inaccessible grain. Furthermore, compared to the dim keylight, the bright keylight greatly suppressed key pecking when paired with inaccessible grain, and reduced the rate of key pecking when paired with accessible grain. Little key pecking occurred in groups exposed to explicitly unpaired presentations of keylight (whether bright or dim) and grain (whether accessible or inaccessible). When the birds in Experiment III were retested with explicitly paired presentations of keylight and grain, little key pecking was observed, suggesting suppressive effects of prior explicitly unpaired presentations. It is suggested that the effects of key-brightness manipulation were produced by the association of grain with cues other than the response key, or by distraction produced by partial illumination of the grain hopper. |
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| Language |
English |
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0022-5002 |
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| Notes |
PMID:16811840 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
273 |
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| Author |
Ayeni, J.S.O. |
| Title |
Utilization of waterholes in Tsavo National Park (East) |
Type |
Journal Article |
| Year |
1975 |
Publication |
African Journal of Ecology |
Abbreviated Journal |
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| Volume |
13 |
Issue |
3-4 |
Pages |
305-323 |
| Keywords |
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| Abstract |
Summary Utilization of waterholes by wildlife was studied between April, 1973 and July, 1974 in Tsavo National Park (East), south of the Voi river. Seasonality was an important factor which influenced the various aspects of waterhole utilization. The numbers of the herbivores utilizing the waterholes increased during the dry season but fell during the rains. Some ungulates also moved near to the artificial waterholes in the dry season but moved away from them during the rains when they drank from natural water-holes formed in clay pans filled with rain water. A basic pattern of waterhole utilization dominated by small (adult-size) species during day-time 06.00–18.00 hours and larger species at night 18.00–06.00 hours is described. The separation in times of arrival and deparature peaks of waterhole utilization, and average coincidence of percentages of paired species populations are used to show that big-game attained a measure of time-spaced ecological separation at the waterholes. The water relations of some day-time and night-time drinkers are discussed. From the baseline study the management implications of the development of additional waterholes in the park are discussed. |
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| Publisher |
Blackwell Publishing Ltd |
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| ISSN |
1365-2028 |
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no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5364 |
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| Author |
Douglas Rh, G.O. |
| Title |
Development of the equine fetus and placenta |
Type |
Journal Article |
| Year |
1975 |
Publication |
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Abbreviated Journal |
J Reprod Fert (Suppl) |
| Volume |
23 |
Issue |
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Pages |
495-498 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1023 |
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| Author |
Imesh Gd, S.G. |
| Title |
Gross and microscopic observations of ovarian abnormalities from five Burchell's zebra |
Type |
Journal Article |
| Year |
1975 |
Publication |
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Abbreviated Journal |
Onderstepoort J vet Res |
| Volume |
42 |
Issue |
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Pages |
109-116 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
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Serial |
1213 |
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| Author |
Welsh Da, |
| Title |
Population, behavioural, and grazing ecology of the Sable Island, Nova Scotia. |
Type |
Manuscript |
| Year |
1975 |
Publication |
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Thesis |
Ph.D. thesis |
| Publisher |
Dalhousie University |
Place of Publication |
Halifax |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
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Serial |
1702 |
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| Author |
Syme, G.J.; Syme, L.A. |
| Title |
The concept of spatial leadership in farm animals: An experiment with sheep |
Type |
Journal Article |
| Year |
1975 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
23 |
Issue |
Part 4 |
Pages |
921-925 |
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| Abstract |
The concept of spatial leadership as applied to farm animals is discussed with particular emphasis on methodological problems. Using three experimental procedures forced spatial leadership orders were measured in a group of Romney ewes. Comparisons between orders showed the effects of both the different experimental tasks and the social context on leadership structure. Both these variables were found to affect the orders obtained. The results are interpreted in terms of the utility of the concept of spatial leadership in domestic animals and the necessity for more systematic procedural investigations in this area. |
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no |
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Serial |
2039 |
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| Author |
Bannikov, A.G. |
| Title |
Recent status of the wild ass in Mongolia |
Type |
Journal Article |
| Year |
1975 |
Publication |
IUCN Bulletin |
Abbreviated Journal |
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| Volume |
6 |
Issue |
4 |
Pages |
16 |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
2219 |
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| Author |
Mitchell, D.; Allen, W. R. |
| Title |
Observations on reproductive performance in the yearling mare |
Type |
Journal Article |
| Year |
1975 |
Publication |
Journal of Reproduction and Fertility |
Abbreviated Journal |
J. Reprod. Fert., |
| Volume |
(Suppl. 23) |
Issue |
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Pages |
531-536 |
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| Abstract |
Reproductive performance was studied in 137 yearling mares run with stallions in small groups for 3 months between June and August in 1968 to 1971 (four breeding seasons). Pregnancy diagnosis by repeated rectal palpation and qualitative tests for PMSG, showed that ninety-five mares conceived of which forty-four aborted spontaneously between days 30 and 160 of gestation. Laboratory examination of twenty-one aborted fetuses failed to show any infectious agents. Serial quantitative and qualitative tests for PMSG in aborting animals gave results similar to those observed in mares with normal pregnancies. Plasma progestagen assays showed marked individual variations although the loss of the conceptus was always associated with a drop in progestagen level. The high incidence of early pregnancy loss in these pubertal mares may also be related to immaturity, inadequate nutrition and physical stress. |
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no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
2378 |
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| Author |
Zimen, E. |
| Title |
Social dynamics of the wolf pack |
Type |
Book Chapter |
| Year |
1975 |
Publication |
The wild canids |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
336-362 |
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| Publisher |
Van Nostrand Reinhold |
Place of Publication |
New York |
Editor |
Fox, M.W. |
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no |
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Equine Behaviour @ team @ |
Serial |
5231 |
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| Author |
Eisenmann V, |
| Title |
Nouvelles interpretations des restes d`équides de Nihowan Equus teilhardi Nov.Sp |
Type |
Journal Article |
| Year |
1975 |
Publication |
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Abbreviated Journal |
Geobios |
| Volume |
8 |
Issue |
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Pages |
125-134 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
| Call Number |
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Serial |
1047 |
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