الفهرس 
Non genetic factorsOnly 14 pages are availabe for public view
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Abstract
Genetic analysis of lactation traits in a comnercial herd of Holstein Friesian cattle kept at Dalla fan11 were carried out 011 data of 4200 records of I0 I0 cow sired by 308 balls Data were collected ill the period liom 19x7 lo 1004 . Yield of milk of 90 day milk yield (90 dMY ) . 180 day milk yield ( I XOtlMY ) . 305 (lily milk yield (305 dMY ) and annual milk yield ( AMY ) were tralits examined.