الفهرس 
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Abstract
This study carried out on laying hens (Bovans strain) at
the Research Farm, Faculty of Veterinary Medicine, Zagazig
University in the period between the first of November (2009)
till end of October (2010).
This work included three experiments to detect the effect
of housing system, stocking density and light duration on the
behaviour and performance of laying hens
I-First experiment:-
Behavioural, productive and physiological responses
of laying hens in relation to housing systems.
In this experiment 100 laying hens 19 weeks aged under
two housing systems (battery system and floor housing system).
The obtained results of this experiment could be
summarized the followings:
1- There was no significantly difference (p < 0.05)in the feeding
behaviour (time and frequency) of laying hens housed in
battery or floor systems, while drinking frequency
significantl y higher in battery system (15.7 ± 1.1 bout) than
floor system (10.5±0.9 bout).
2- The standing time and sitting frequency were significantly
higher in battery housed hens than those housed in the floor