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Hormone Implants Affecting Territory Size and Aggressive and Sexual Behaviour in Red Grouse

Adam Watson and Raymond Parr
Ornis Scandinavica (Scandinavian Journal of Ornithology)
Vol. 12, No. 1 (Feb., 1981), pp. 55-61
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3675905
Stable URL: http://www.jstor.org/stable/3675905
Page Count: 7
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Hormone Implants Affecting Territory Size and Aggressive and Sexual Behaviour in Red Grouse
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Abstract

After androgen implants, territorial Red Grouse cocks sang more than before, had more encounters with neighbours, and chased hens more, and did so more than unimplanted cocks. They moved more often on to adjacent territories, and took ground there despite the neighbours being initially dominant. Androgen-implanted non-territorial cocks challenged territorial cocks and eventually got small territories despite losing most encounters. After an oestrogen implant, a territorial cock with a big territory and two hens was deserted by hens, sang less, had fewer encounters with neighbours, and eventually gave up his territory.

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