Summary This study was conducted on rabbits (Oryctolagus cuniculus) of different breeds at experimental chamber belonging to Faculty of Veterinary Medicine, Zagazig University through the period of June, 2013 till the end of May, 2014. This work included five experiments to detect the effect of stocking density, season and breed, cage enrichment and cage floor type on behaviour and productive performance of growing rabbits and to estimate the effect of remating interval on productive and reproductive performance of does. First experiment:- The effect of stocking density and group size on the behaviour and performance of growing rabbits: The obtained results could be summarized the following: 1-The feeding behaviour (time and frequency) decreased significantly with increasing the stocking density. Rabbits housed at 5/cage and had 10rabbits/ m2 stocking density had the highest feeding time and frequency (1099.65 ± 99.13a sec and 7.21±0.66 a bout, respectively) than other treatments. Moreover, drinking and caecotrophy behaviour were not significantly affected by stocking density. 2-Stocking density did not significantly influence on exploratory and social behaviour. 3-Rabbits housed at 3 and 5 rabbits/cage (6 and 10rabbits/ m2) had significantly lower body care behaviour (duration and frequency) than that housed at 7 and 9rabbits / cage (14 and 18rabbits/ m2) as well as stretching frequency was significantly higher in T3 than other groups. 4-Resting time and frequency was increased significantly with increasing stocking density but on the contrary, locomotion and decreased significantly with increasing stocking density. 5-Increasing stocking density had adverse effect on aggression and abnormal behaviour (time and frequency) as they were higher in higher stocking density. 6-6-Stocking density had no significant effect on productive performance of growing rabbits. 7-Body and ear lesions were higher at rabbits reared at 9 animals/ cage (18 rabbits/ m2). 8-Cortisol level was significantly (P≤0.01) higher at highest stocking density. Second experiment:- Effect of remating interval on the reproductive performance of rabbits: The obtained results from this experiment explained the following: 1-There was a highly significant effect on the doe receptivity where does were highly receptive on the first day after parturition and acceptance of mating decreased with increasing postpartum remating interval. 2- The conception and kindling rate were decreased with increasing the remating interval after parturition. 3-Neither gestation period nor average daily milk yield affected by remating interval significantly. 4-Parturitions intervals were increased with increasing the remating interval post partum. 5-Does remated at 21 day post partum were heavier at mating and along the pregnancy period than other that remated 1,7 and14 day after parturition. 6-Remating interval had no significant effect on litter size at birth (LSB) and at weaning (LSW) although does remated at 21 day pp had the lowest litter size at weaning (4±2.3). 7-Stillbirth percent was not affected by remating interval although it was decreased with increasing the period between parturition and remating while the pre mortality rate was higher at longer remating interval group (51.3±28.9 %). 8-Litter weight from birth till weaning age (28 day of age) was not affected by time of remating after parturition but the litter from does remated at 21 pp had the lowest weight from birth till weaning. 9-Kit weight was at birth, 21 day and at weaning was not differed between different remating interval while at 7 and 14 day of age, kit weight was the highest for does remated 1 day pp and the lowest for does remated at 21 day pp. 10- The level of blood oestrogen hormone was significantly higher for does remated at 1 day pp while the progesterone level was lower for does remated at 14 and 21 day pp. 11-Leptin level was increased with increasing the remating interval. Third experiment The effect of breed and season on the behaviour and performance of growing rabbits: The obtained results could be summarized the following: 1-Season had a significant effect on all productive traits measured (Average body weight, daily weight gain, relative growth rate, feed consumption, feed conversion ratio and feed efficiency) of growing rabbits as summer season recorded the worst values while the winter gave the best results. 2- Breed had no significant effect on productive traits of growing rabbits except the relative growth rate which was significantly lower in Rex rabbits breed (80.86±1.44). 3- The interaction between season and breed had no detectable influence on all on all productive traits growing rabbits measured. Forth experiment The effect of cage enrichment on the behaviour and performance of growing rabbits: The obtained results from this experiment could be summarized as the following:- 1-There was no significant difference in feeding, drinking and caecotrophy behaviour (time and frequency) between rabbits housed in cages with gnawing sticks or without. 2-The comfort behaviour with its two forms and social behaviour were higher in enriched cages with gnawing sticks than unenriched ones without significant difference. 3-Growing rabbits housed in enriched cages had more investigatory behaviour (sniffing and rearing) than others in unenriched cages. 4-Resting and locomotion behaviour (duration and frequency) were higher in cages without gnawing sticks) without significant difference while standing behaviour (duration and frequency) was increased significantly in cages without gnawing sticks. 5-Enrichment of growing rabbit's cages with gnawing sticks had a significant positive effect in reducing aggression and abnormal behaviour of growing rabbits. 6-The body weight, relative growth rate and daily feed consumption of rabbits housed in enriched cages with gnawing stick were higher than that in unenriched cages without significant difference. 7-The daily body weight gain and feed conversion rate were significantly better for rabbits housed in enriched cages (26.19±0.31 and 4.12±0.05 respectively). 8-The level of cortisol of rabbits was insignificantly lower in caged with gnawing stick than that without gnawing sticks (0.34±0.08 vs. 0.62±0.10 ɱg/dl). 9-Placing gnawing stick in rabbits' cages had no influence of most carcass traits. Fifth experiment: The effect of floor type of the cage on the behaviour and performance of growing rabbits:- The obtained results could be explained as the following:- 1-The feeding frequency was significantly (P≤0.05) lowest for rabbits housed on wire cage floor while the feeding time was not significantly differed between groups. 2-On other hand, the time of drinking was the highest for rabbits reared on plastic cage floor. 3-The type of cage floor had no significant influence on drinking frequency and caecotrophy behaviour (time and frequency). 4-Exploratory behaviour (sniffing and rearing), social, comfort (body care and stretching) locomotion and standing behaviour were not significantly affected by type of cage floor. 5-Growing rabbits reared on rubber floor rest more than others reared on wire or plastic floor. 6-The time of aggressive and abnormal behaviour was significantly higher in cage with wire floor (9.33±4.2a sec and 89.16±28.80a sec/h respectively) than cages had rubber and plastic mat on floor. 7-Application of rubber or plastic mat on the floor of rabbits' cage had no significant effect on body weight, relative growth rate and feed consumption of growing rabbits although, the body weight gain, feed conversion rate and feed efficiency were significantly better for rabbits reared on plastic floor. 8-Placing plastic or rubber mat on wire cage floor significantly decreased the cortisol level of growing rabbits. 9-The type of cage floor had no significant effect on carcass traits.