الفهرس 
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Abstract
This study was carried out on three private dairy farms at
Sharkeya province in addition to individual cases belonged to the
peasants at Hehia city and some villages . This work included three
experiment:
J- First experiment: Reproductive traits of Egyptian buffaloes
cows.
In this experiment three private specialised dairy farms were
monitored in addition to 100 individual cases belonged to the peasants
at Hehia city and some villages for collecting the data to explain the
main causes of infertility problem in Egyptian dairy buffaloes m
relation to management system.
The obtained results could be summarized as the following:
1- There was a non significance variation in age at first oestrous,
insemination, first calving and calving interval between
specialised dairy farms and village system although, these
results were higher at specialised dairy farms with intensive
management compared with village systems(P<0.05).
2- The time of post partum oestrous, conception and insemination
times improved with specialised dairy farms than village system
and the difference was highly significance. As the dairy
buffaloes reared at specialised dairy farms came to post partum
oestrous and insemination faster than those reared at village
system.