A study was conducted to evaluate the effect of monochromatic light on sexual maturity, production performance, and egg quality of laying hens. A total of 144 14-week-old Hy-Line Brown chickens were reared in cages and illuminated under four different light treatment groups with three
replicates (12 birds per replication, n = 12) for 14 to 60 weeks. A 60 W incandescent light bulb (IL) was used as a control, and white light (WL), blue light (BL), and red light (RL) were produced using light emitting diode lamps. The four light treatment groups each had an intensity
of 20 lux. A significant delay in laying was observed when pullets were reared under BL compared to all the other light treatments. By contrast, pullets reared under RL laid significantly earlier than those under IL and BL. Hens reared under RL produced significantly higher number of eggs
than those under IL and BL, and hens reared under WL produced more eggs than those under BL from 18 to 60 weeks. Feed intake was significantly increased when birds were reared under RL compared to WL and BL. The egg weight was significantly higher in BL compared to WL and RL from 41 to 50
weeks. The FCR was significantly increased when birds were reared under RL compared to other light treatments from 31 to 40 weeks and from 18 to 60 weeks. By contrast, birds reared under RL exhibited significantly increased egg shell thickness compared to birds reared under IL and BL. The
ovary weight of laying pullets grown under WL was significantly higher compared to other treatments at 16 weeks of age. It is concluded that birds reared under RL matured earlier, increased egg production and egg shell thickness, but feed conversion rate was not improved under RL.
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EGG SHELL QUALITY;
Document Type: Research Article
Publication date: 2012-06-01
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Avian Biology Research provides a forum for the publication of research in every field of ornithology. It covers all aspects of pure and applied ornithology for wild or captive species as well as research that does not readily fit within the publication objectives of other ornithological journals. By considering a wide range of research fields for publication, Avian Biology Research provides a forum for people working in every field of ornithology. The journal also includes sections on avian news, conference diary and book reviews.
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Cover image:Grey Hypocolius (Hypocolius ampelinus) chicks in their nest. Photo by Dr Masoud Moosavi.
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