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Plasma LH levels following long-term exposure to white, red, or blue light. Drakes raised under red, blue or short day white lights showed significant reduction in plasma LH levels compared to ducks on long day, white. Ducks who were switched from short-day white light, to long-day, red + blue light showed gonadal recrudescence and increased LH levels. **P < 0.01, ***P < 0.001.
