الفهرس 
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Abstract
The present study suggested in. order exploring the Effect of Crossing on Productive Performance of Rabbits by using three breeds of rabbits which are : New Zealand White ( NZW ) , Giant Grey Flanders ( FF ) , and Belgian ( BB ) breeds for measuring of body weights , relative body weight , average. daily gain, blood parameters , immune status against sheep red. Blood cells , and carcass characters
The results can be summarized as following:
1- Purebreds showed higher body weight than crossbreds. Males and females of the purebreds were the heaviest at the market age.
2- Purebreds showed. The highest level of total protein and albumin level
3- Reciprocal crossbreds were the highest for globulin level while Crossbreds were the highest for glucose
4- Purebreds were the highest for cholesterol level
5- Purebreds showed the highest immune response to sheep red blood cells at first dose, but crossbreds showed the highest response at the 12 ”d doge.
6 Purebreds had the heaviest live body weight.
- So the crossing of Flanders with NZW is used for improvement of body weight, carcass traits , and organ weight % of both sexes. Using Belgian breed in crossing lead to decrease immune level *in the offspring produced.