South African Journal of Animal Science
On-line version ISSN 2221-4062
Print version ISSN 0375-1589
LEWIS, P.D.; GOUS, R.M. and TUMOVA, E.. Broiler performance and bone strength minimally affected by either a simulated dusk or night-interruption photoperiod. S. Afr. j. anim. sci. [online]. 2010, vol.40, n.1. ISSN 2221-4062.
Two genotypes of male broilers were given 12 h of daily illumination; as a conventional photoperiod, with the final hour at reduced illuminance to simulate dusk, or with 1 h of the light given during the middle of the night. The lighting modifications had no significant effect on any performance variable or on tibial breaking strength. Feed intake was unaffected by the lighting treatments during either the 1-h dusk period or the night, but was inexplicably stimulated in the both experimental groups during the main photoperiod.
Keywords : Photoperiod; dusk; broiler growth; bone strength.