الفهرس 
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Abstract
The present investigation carried out to study the effect of seasonal changes on the rate of Meiotic divisiot it the local Baladi strain of rabbits.The effect of seasonal variation on some fitness conip— onents in Baladi and other imported breed,namelly Bou— scat ,were also studied. The fitness components were litter size,body weight,viability,and gtstation period. The crosses between the two breeds i.e. Baladi and Bouscat were carried out and average body weight, viability and sex ratio were recorded for the offspring. The fitness components were estimated at different periods of animal ages. The results obtained in this investigation indicated that :—
1 — The frequencies of different meiotic stages indicated that Pachytene, diplotene and diakinesis of prophase I recorded the other stages . The metaphase I and anaphase I of the first meiotic divisions and also metaphasell and anaphasell of the second meiotic division were observed in very low frequenceies.
2 — The frequencies of the diffrent Meiotic stages showed cosidrable reduction in the different Meiotjc stages show. ed considerable reduction in the percentage of different stages during the summer than the winter season
3 — mean litter size was generally kigher in Bouscat than in Baladi rabbit
4 — seasonal changes had little effect on litter size in Bouscat rabbits.