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Author |
Boesch C; Boesch H |
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Title |
Tool use and tool making in wild chimpanzees |
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Year |
1990 |
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Folia Primatol. |
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54 |
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86 |
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Equine Behaviour @ team @ |
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2983 |
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Author |
Cheney DL; Seyfarth RM |
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Title |
Attending to behaviour versus attending to knowledge: examining monkeys' attribution of mental states |
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Journal Article |
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Year |
1990 |
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Animal Behaviour. |
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Anim. Behav. |
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40 |
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742 |
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Equine Behaviour @ team @ |
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2987 |
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Author |
Heyes CM; Dawson GR |
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Title |
A demonstration of observational learning using a bidirectional control |
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Year |
1990 |
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Q. J. Exp. Psychol. |
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42 |
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59 |
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Equine Behaviour @ team @ |
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3008 |
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Author |
Povinelli DJ; Nelson KE; Boysen ST |
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Title |
Inferences about guessing and knowing in chimpanzees (Pan troglodytes) |
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Journal Article |
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Year |
1990 |
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J. Comp. Psychol. |
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104 |
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203 |
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Equine Behaviour @ team @ |
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3030 |
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Author |
Visalberghi E |
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Title |
Tool use in Cebus |
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Journal Article |
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Year |
1990 |
Publication |
Folia Primatol. |
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54 |
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146 |
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Equine Behaviour @ team @ |
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3045 |
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Author |
Spear, N.E.; Miller, J.S.; Jagielo, J.A. |
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Title |
Animal Memory and Learning |
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Journal Article |
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Year |
1990 |
Publication |
Annual Review of Psychology |
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41 |
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1 |
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169-211 |
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refbase @ user @ |
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3538 |
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Author |
Huizinga, H.A.; Boukamp, M.; Smolders, G. |
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Title |
Estimated parameters of field performance testing of mares from the Dutch Warmblood riding horse population |
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Journal Article |
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Year |
1990 |
Publication |
Livestock Production Science |
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Volume |
26 |
Issue |
4 |
Pages |
291-299 |
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Keywords |
competition; genetic parameters; horse breeding; mares; performance test |
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The field performance testing (FPT) of mares of the Dutch Warmblood riding horse population is evaluated. Phenotypic and genetic parameters of scored traits are estimated and the genetic relationship with performance of half-sibs in dressage and jumping competition are estimated. Data from 1984 to 1987 are used, covering scores from 2023 at least 3-year-old mares. Seven subjectively scored traits are considered, walk, trot, canter, riding ability, character, jumping ability and total score. Analysis of data is according to a sire model. Variance and covariance components are estimated by Restricted Maximum Likelihood (REML) procedures. Estimates of heritability are moderately low for gaits (average 0.19), jumping ability (0.15) and total score (0.17) and extremely low for riding ability (0.03) and character (0.06). Dressage in competition is most correlated with riding ability (0.83) and is moderately correlated with total score (0.41) from FPT of mares. Jumping competition is most correlated with jumping ability (0.48) and not correlated with total score (0.05) from field test of mares. Some possible bias owing to previous knowledge and preselection is discussed. It is concluded that efficiency of present FPT of mares is limited for selection of broodmares for dressage and jumping ability in competition. |
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refbase @ user @ |
Serial |
3964 |
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Author |
Philipsson, J.; Arnason, T.; Bergsten, K. |
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Title |
Alternative selection strategies for performance of the Swedish warmblood horse |
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Year |
1990 |
Publication |
Livestock Production Science |
Abbreviated Journal |
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Volume |
24 |
Issue |
3 |
Pages |
273-285 |
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Abstract |
The Swedish riding horse population includes about 6000 broodmares and 150 breeding stallions. The overall breeding goal is to produce riding horses competitive in several disciplines, i.e. dressage as well as showjumping and eventing. The effectiveness of this multi-purpose objective was studied in alternative strategies for selecting stallions and mares as candidate dams for them. The alternative selection strategies for stallions included 1-stage (conformation), 2-stage (conformation and performance test) and 3-stage (conformation, performance test and competition results at advanced levels) selection schemes. The mare selection schemes included the corresponding 1- and 2-stage selection schemes. The results clearly showed the 2-stage selection procedure to be most efficient, especially for stallions. It is important that the intensity in selection after the performance test is kept high. Differences in defining the breeding objective are less important, provided the selection is based on a performance test including both dressage and jumping. According to the results, the development of the Swedish performance testing scheme, in which now only 30% of the tested stallions are selected for breeding, seems justified. In mare selection schemes, performance tests also seem to be justified, especially if jumping ability is to be improved. Differences between field and station tests are only minor and since the volume of testing can be much higher in the field this would allow a much stronger selection and should thus be preferred. |
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refbase @ user @ |
Serial |
3965 |
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Author |
Potter, G.D.; Yeates, B.F. |
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Title |
Behavioral principles of training and management |
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1990 |
Publication |
The Horse, 2nd Edn |
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665-682 |
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Cited By (since 1996): 4; Export Date: 21 October 2008 |
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Equine Behaviour @ team @ |
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4540 |
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Author |
Cheney, D.L.; Seyfarth, R.M. |
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Title |
How Monkeys See the World |
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Miscellaneous |
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1990 |
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Equine Behaviour @ team @ |
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4866 |
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