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- W2004359743 abstract "Concentrations of plasma testosterone (T) and luteinizing hormone (LH) were measured by radioimmunoassay in captive male willow ptarmigan (Lagopus lagopus lagopus) in Tromsø (69°40′ N) during an annual cycle and while maintained for up to 22 months on permanent short days (6L, 18D). In birds exposed to natural changes in day lengths, the concentrations of T and LH were at their lowest between July and October and increased slightly during December and January. The concentration of plasma LH began to increase steeply in late March when the day length was between 14 and 16 hr and was associated with a temporary depression in the concentration of plasma T. Plasma T began to increase steeply in late March when the day length was between 14 and 16 hr and was associated with a temporary depression in the concentration of plasma T. Plasma T began to increase steeply in late April, about 1 month later than the increase in plasma LH, and the concentrations of both hormones reached seasonal maximum values in May. In late May and early June the concentrations of plasma T and LH fell, with the concentration of T falling before that of LH. The rate of fall in T and LH during June was not modified by the presence of a mate. In birds maintained on a permanent short day length for up to 22 months, the concentrations of plasma T and LH did not show seasonal or cyclical variations; they were similar to the values observed in December and January in birds exposed to seasonal changes in day length." @default.
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- W2004359743 date "1980-01-01" @default.
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- W2004359743 title "Seasonal changes in the concentrations of plasma luteinizing hormone and testosterone in willow ptarmigan (Lagopus lagopus lagopus) with observations on the effects of permanent short days" @default.
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- W2004359743 doi "https://doi.org/10.1016/0016-6480(80)90101-x" @default.
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