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A Factor Analysis of Seasonal, Behavioral, Hormonal and Body Weight Changes in Adult Male Barheaded Geese, Anser Indicus

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Individual measurements of courting, aggression, pairbond displays, body weights and the circulating levels of testosterone, LH, T4 and prolactin in male barheaded geese were subjected to a factoral analysis. Data from the whole year were analysed and then broken up into pre-breeding and post-breeding components and re-analysed. Some parameters remained clumped in the same factors throughout like aggression and pair-bond displays, LH and testosterone, and prolactin and body weight. Others, especially behavioral and endocrinological parameters were only linked on either an annual or seasonal basis.

Affiliations: 1: Max-Planck-Institut für Verhaltensphysiologie, Seewiesen and Andechs, F.R.G.


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