الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The present study was conducted for one major objective to improve the reproductive performance of high- producing holstein dairy cows by decreasing their days open and calving interval, improving conception and pregnancy rates to Al and ultimately improving the econoics of the dairy farm under study utilizing the ultrasound technology along with the ovulation synchronization protocols.