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GoerlichDaniel NättMagnus ElfwingBarry Macdonald and Per Jensen    Transgenerational effects of early experience on acute stress reactions in behaviour, steroid hormones and gene expression in the precocial chicken   Hormones and Behavior,61 5 Beatrix Eklund and Per Jensen    Domestication effects on behavioural synchronization and individual distances in chickens Gallus gallus   Behavioural Processes,86 2 I flera studier har man sett att det finns skillnader mellan raserna hos vuxna hundar när det gäller lekbeteenden men inga studier är gjorda gällande valpar. To test significant differences Kruskal-Wallis test were used. Biological Sciences, Genes, Genomes, Genetics,6 2

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Genes, Genomes, Genetics,6 2

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Jennie HåkanssonCarl Bratt and Per Jensen    Behavioural differences between two captive populations of red junglefowl Gallus gallus with different genetic background, raised under identical conditions   Applied Animal Behaviour Science, Biological Sciences, Johanna Väisänen and Per Jensen    Social versus exploration and foraging motivation in young red junglefowl Gallus gallus and White Leghorn layers   Applied Animal Behaviour Science,84 2 Per JensenB. To test significant differences Kruskal-Wallis test were used. In several studies there have been differences between breeds among adult dogs when it comes to play behaviour but no studies have been done regarding puppies.

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