17 A. S. Jatoi M. K. Khan A. W. Sahota M. Akram K. Javed M. H. Jaspal S. H. Khan Journal of Animal and Plant Sciences JAPS 20132013/06/01 23 3 727-730 1018-7081 NA <p>A study was conducted at Avian Research and Training Centre, University of Veterinary and Animal Sciences, Lahore to investigate earlier effect of continuous and intermittent lights in 3 local and one imported close-bred flocks of Japanese quails (Coturnix coturnix japonica) on their post-peak egg production. Day-old quails were provided continuous 24 hours light up to first 2 weeks and were maintained under 5 different light treatments, A (16L: 8D), B (8L: 6D: 2L: 8D), C (8L: 7D: 1L: 8D), D (8L :7.5D: 0.5L: 8D) and E (8L: 16D) from 3rd to 14th weeks and from 15th weeks onward provided light 16L: 8D. In this trial, 22 weeks-old 240 quails of the same treatments were kept from 23 to 34 weeks under factorial arrangements (5 lights x 4 close bred flocks x 3 replicates of 1 male: 3 females each in a 5 tier battery) under same management. The results showed significant effect of light treatments on body weight (p&lt;0.01), feed intake (p&lt;0.01), egg production (p&lt;0.05) feed conversion ratio (feed/dozen egg) and FCR (feed/ egg) (p&lt;0.01). The highest body weight was recorded under treatment B, however, A, C, D and E differed non-significantly. Higher feed intake was observed under treatment A, varying non-significantly with treatment D. The birds in group A produced significantly (p&lt;0.05) more eggs than in other experimental treatments. FCR in group E was significantly (p&lt;0.05) better than in all other light treatments. Light and strain interaction was significant (p&lt;0.01). The quail strains differed in the above parameters.</p> Light regimens, body weight, egg production, egg weight, feed intake, FCR Pakistan Agricultural Scientists Forum https://thejaps.org.pk/AbstractView.aspx?mid=2013-JAPS-307