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- W2160329054 abstract "In total, 120 Thai-native pullets (Gallus domesticus) aged 18 wk were housed in floor pens, located in a conventional open-sided shed under natural daylight (12L:12D) and randomly divided into 3 groups; Groups 1 (DF) and 2 (DR) were reared under natural daylight and supplemented with fluorescent or red light, respectively, whereas group 3 (R) was maintained in light-controlled pens and exposed only to red light. The red light was produced by light-emitting diodes. All treatments were provided with 16 h of light per day (16L:8D) during a 26-wk egg-laying period, and there were 4 replicate pens of 10 hens for each treatment. Photostimulation of these light sources was initiated at 18 wk of age and subsequent effects on reproductive performance were observed during the experimental period. Morphological characteristics of the eyes and eggshell microstructure were examined at the end of the study. Feed and water were provided ad libitum. There were no significant differences in BW, feed intake, egg weight, egg quality, or mortality rate due to the treatment. Pullets in the R and DR treatment groups commenced egg production significantly earlier than those in the DF treatment group. In early-season egg production (0–8 wk), cumulative egg number was significantly (P < 0.05) higher for the R treatment (25.9 eggs/hen) than for the DR (20.9) and DF (19.5) treatment groups. No significant differences in total egg production per hen occurred among the treatment groups. At 2 wk following photostimulation, hens in the R treatment group had significantly (P < 0.05) higher serum estradiol concentrations compared with hens in the other treatment groups. Neither eggshell structure nor eye morphology was affected by the treatments. It was concluded that the spectrum of red light did not affect live performance, egg production, egg quality, eggshell microstructure, or eye morphology of Thai-native hens, except for in accelerating sexual development. The light-emitting diode lighting system would be beneficial for energy savings and the reduction of rearing costs." @default.
- W2160329054 created "2016-06-24" @default.
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- W2160329054 date "2011-12-01" @default.
- W2160329054 modified "2023-09-26" @default.
- W2160329054 title "Influence of red light on reproductive performance, eggshell ultrastructure, and eye morphology in Thai-native hens" @default.
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- W2160329054 doi "https://doi.org/10.3382/ps.2011-01652" @default.
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