الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
 |  | from | 156 |  |  |
| | | from | 156 | | |
Abstract
the sources of data was collected from the records of freisian herd at sakha station farm, belonging to the animal production research insitute, ministry of agriculutre. the data was covered the period from1986to1992. the total number of calves in this study were1350.