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Author |
Anderson B. |
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Title |
Dendrites and cognition: A negative pilot study in the rat |
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1995 |
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Intelligence |
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20 |
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291-308 |
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3453 |
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Author |
Gärdenfors P. |
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Title |
Cued and detached representations in animal cognition |
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Journal Article |
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1995 |
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Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
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35 |
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263-273 |
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3454 |
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Author |
Beer C.G. |
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Title |
Trial and error in the evolution of cognition |
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Journal Article |
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1995 |
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Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
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35 |
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215-224 |
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3455 |
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Laughlin N.K.; Lasky R.E.; Luck M.L.; Kluender K.R.; Hecox K.E. |
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Title |
Early lead exposure alters behavioral and electrophysiological indices of auditory processing in the rhesus monkey |
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Year |
1995 |
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Neurotoxicology and Teratology |
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17 |
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374-374 |
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3456 |
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Author |
Koenen, E.P.C.; van Veldhuizen, A.E.; Brascamp, E.W. |
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Title |
Genetic parameters of linear scored conformation traits and their relation to dressage and show-jumping performance in the Dutch Warmblood Riding Horse population |
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Journal Article |
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Year |
1995 |
Publication |
Livestock Production Science |
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43 |
Issue |
1 |
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85-94 |
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Horse; Heritability; Conformation; Dressage; Show jumping |
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In this study genetic parameters of linear scored conformation traits of the Dutch Warmblood Riding Horse were estimated in relation to performance in competition. Observations on 10 665 mares were analyzed with an animal model including the fixed effects age, classifier, location and percentage of thoroughbred. Using restricted maximum likelihood algorithms, heritabilities of 26 linear scored conformation traits were estimated in the range 0.09-0.28. Several conformation traits had high up to very high mutual genetic correlations. Competition results of 3476 horses with performance in dressage and 3220 horses with performance in show-jumping were linked to the conformation data to estimate the genetic relationship between conformation and performance in competition. The model for the evaluation of the competition results included the fixed effects riding club, age and sex. Estimated heritabilities for dressage and show-jumping were 0.17 +/- 0.05 and 0.19 +/- 0.04, respectively. Genetic correlations between conformation and performance were low to moderate. The length of the neck, length and position of the shoulders, shape and length of croup and muscularity of the haunches had a significant moderate genetic correlation with dressage. Muscularity of the neck, shape of the croup and muscularity of the haunches had a significant genetic correlation with show-jumping. The results indicate that, due to the low genetic correlations with performance traits, indirect selection for performance using conformation results is of limited value. |
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no |
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refbase @ user @ |
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3961 |
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Author |
McDonnell, S.M.; Haviland, J.C.S. |
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Title |
Agonistic ethogram of the equid bachelor band |
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Journal Article |
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Year |
1995 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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43 |
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3 |
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147-188 |
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Equid; Horse; Bachelor; Agonistic; Social behavior; Ethogram |
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An ethogram of agonistic and related behaviors among equid bachelor band members was developed. Several key English-language studies on equids were reviewed to derive a preliminary inventory of specific behaviors to be included in the ethogram. A bachelor band of domestic pony stallions pastured together was observed for approximately 50 daylight hours to obtain detailed descriptions of each behavior, enable photographic and video documentation of behaviors, and identify any behaviors to be added to the preliminary inventory. An initial draft of the ethogram was sent to 65 equine researchers for review. Twenty-eight critical reviews were received and their suggestions considered for the final draft. A total of 49 elemental behaviors including five distinct vocalizations was included in the ethogram. Three complex behavioral sequences were also included. Most of the behaviors catalogued from the direct observation of pastured pony stallions were also found in the equid literature. For many, references to these behaviors specifically among males or bachelor band members were not found. The results offer a practical tool for quantitative research and other studies of equid inter-male behavior as well as for teaching of equid behavior, and should facilitate progress toward development of a complete ethogram for the horse and other equids. |
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refbase @ user @ ; Equine Behaviour @ team @ room B 3.029 |
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749 |
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