الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
A total of 1863 normal lactation records relevant to 748 holstein- friesian cows herd kept at nubaria region. Located in the desert road. K 51 Alex Cairo. The herd under this investigation belongs to private project. The records covered the period from 1995 to 2005.