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British Poultry Science|May 1, 1997
Effect of size and timing of photoperiod increase on age at first egg and subsequent performance of two breeds of laying henP D Lewis, G C Perry, T R MorrisBritish Poultry Science|February 22, 2011
Reproductive status in broiler breeder males is minimally affected by a mid-cycle increase in photoperiodN C Tyler, P D Lewis, R M GousBritish Poultry Science|May 6, 1998
A model for the effect of constant photoperiods on the rate of sexual maturation in pulletsP D Lewis, T R Morris, G C PerryBritish Poultry Science|February 12, 2000
Effects of environmental enrichment, fluorescent and intermittent lighting on injurious pecking amongst male turkey poultsC M Sherwin, P D Lewis, G C PerryThe British Journal of Dermatology|July 24, 2009
A study of mitochondrial DNA D-loop mutations and p53 status in nonmelanoma skin cancerS L Prior, A P Griffiths, P D LewisChild'S Nervous System : Chns : Official Journal of the International Society for Pediatric Neurosurgery|February 10, 1998
Cerebello-pontine angle epithelioid haemangioendothelioma in a 4-year-old boyA G Tammam, P D Lewis, H A CrockardPoultry Science|September 3, 1999
Light intensity and age at first egg in pulletsP D Lewis, T R Morris, G C PerryBritish Poultry Science|March 1, 1995
Effect of photoperiod on the mean oviposition time of two breeds of laying henP D Lewis, G C Perry, T R MorrisBritish Poultry Science|December 1, 1996
Effect of constant and of changing photoperiods on age at first egg and related traits in pulletsP D Lewis, G C Perry, T R MorrisBritish Journal of Neurosurgery|December 1, 1996
Posterior fast craniopharyngiomaE M Bashir, P D Lewis, M R EdwardsPageof 22