الفهرس 
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Abstract
This study was carried out at Agricultural Research Centre belonging to Minia University, Shosha village, Samalut city, El-Minia Governorate, Egypt throughout the period from November 2017 till July 2018 on a total of 120 ewes and 15 rams to investigate the effect of some factors including age, breed, season, flushing, GnRH and clomiphene citrate administration on the reproductive behaviour and performance of male and female Ossimi and crossbred sheep. The obtained results revealed that Sexual behaviour and consequently sexual performance of Ossimi and crossbred rams may be influenced by some factors such as age, breed and season. Old rams had better sexual performance than young ones. Some variations in sexual behaviour patterns and sexual performance may occur due to breed difference. Seasonal variations had no significant effect on sexual behaviour. A great variation in testosterone level could occur in different breeds of rams in relation to seasonal variations. Scrotal circumference was significantly influenced by age of the rams but there was no clear effect of breed and season in this respect. Flushing slightly improved the reproductive performance of Ossimi ewes. In addition, there was no difference between flushing with energy and protein sources on the reproductive performance of Ossimi ewes. Ewes that received GnRH had non-significant higher reproductive performance than control group. Reproductive performance of Ossimi ewes was negatively influenced by the use of clomiphene citrate.