Effect of day length and reproductive st
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Wingfield, John C. ;Vleck, Carol M. ;Farner, Donald S.
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Article
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1981
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John Wiley and Sons
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English
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## Abstract Plasma levels of LH were measured through the course of 24 hours in photosensitive and photorefractory, adult male whiteβcrowned sparrows, __Zonotrichia leucophrys gambelii__, exposed to both long (20L, 4D) and short (8L, 16D) days. In photorefractory birds held on both long and short d