الفهرس 
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Abstract
This study was carried out in the Rabbitry of the Poultry Production Unit, Faculty of Agriculture, Mansoura University within the project (Productive Improvements of Rabbits). This project aimed to improve the productivity of rabbits by crossbreeding and/or incorporating some untraditional agriculture by-products which produced on great amounts in Dakahlia Governorate in rabbit diets.
The present work investigated the effects of using dried tops of sugar beet (SBT) in the diets of growing rabbits. The dried SBT were used instead of clover hay at the levels 0, 10, 20 and 30% SBT, as well as, the free choice of SBT beside the control diet.
Fifty New Zealand White (NZW) rabbits at 5 weeks of age were individually housed in galvanized wire cages, which enable us to record the individual feed intake from 5 to 13 weeks of age.
The obtained results could be summarized as follows :
Live body weight :
The feeding treatment had no significant effects on live body weight at all studied ages from 5 to 13 weeks, except at 9 weeks of age.
Offering SBT with C diet the same time reduced live body weight at 13 weeks of age, where C surpassed CT by about 4.06% in this respect.
Rabbits fed 10% SBT surpassed the other groups in body weight from 11 to 13 weeks of age.
Daily weight gain :
Differences in daily weight gain due to the effect of feeding treatment were significant (P> 0.01) only at the 6th, 7th, 8th and (P> 0.05) at 13th weeks of age.
Daily weight gain at the periods 9 – 13 and 5 – 13 weeks of age was not significantly differed among all treatments. However it was significantly ( P > 0.01 ) differed at the period 5 – 9 week of age.
Offering SPT with C diet in CT group decreased daily weight gain at the periods 5 – 9 and 5 – 13 weeks of age than the C group.