الفهرس 
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Abstract
One hundred seventy one pure Holstein dairy cows of about 600-700kg body weight were used in the current work to syudy the influence of the level of rumen undergredable protein on reproductive performance.Our work is divided into two experiments,the 1st experiment was a preliminary study on ninety five Holstein dairy cows from private Egyptian farms to show the relationship between fertility condition and elevation of milk urea nitrogen.