Influence of Intensity of Lighting on Egg Production Rate and Oviposition Rhythm in Japanese Quail Under 14 L: 10 D Light and Dark Cycle.
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This study was designed to investigate the influence of intensity of lighting on egg production rate and oviposition rhythm in Japanese quail (Coturnix coturnix japonica) under a 14L: 10D light regime.In experiment 1, hens of three groups were exposed to 77Lux (Group name, 80L), 770Lux (770L) and 1490Lux (1500L) for 12 weeks. In experiment 2, four groups were exposed to light intensities of 59Lux (60L), 181Lux (180L), 442Lux (440L) and 847Lux (850L) for 20 weeks. In experiment 3, two groups of hens were exposed to 55Lux and 75Lux respectively for 4 weeks. The intensities were then lowered to 25Lux for one group (25L) and 6Lux for the other group (6L) for 6 weeks. When the experiments began, birds in experiments 1 and 2 were 13-14 weeks of age and birds in experiment 3 were 33 weeks of age. All hens used in those experiments had been exposed to light intensities of 65Lux in average and a 14L: 10D regime. For all three experiments, oviposition times of each hen were recorded daily.In experiment 1, egg production rates of 770L and 1500L were 94.5 and 94.8% respectively, and significantly(P<.05) higher than that of 80L (88.7%).The interval hours between consecutive oviposition of 770L and 1500L birds were both 24.1 and significantly shorter(P<.05) than for the 80L birds by 0.5 hour. In experiment 2, egg production rates of all four groups were over 90% with no significant differences among groups. Hens exposed to 440L and 850L laid eggs significantly shorter in the intervals(24.3 and 24.1, respectively) than those of 60L and 180L (24.5 and 24.4, respectively). In experiment 3, egg production rate was over 92% before changing to the lower intensities and the rate were significantly (P<.01)decreased by 5-6 percentage after changing to 25 or 6Lux. The oviposition intervals after changing were 25.3 hours for both groups and significantly (P<.01) longer than those before the change by 0.4-0.8h.Based on the results of these experiment, the intensity of light appears to be an important photo-factor for egg production and for influencing the oviposition rhythm in Japanese quail.
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日本家禽学会 | 論文
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