الفهرس 
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Abstract
Blind randomized field clinical trials were conducted to elucidate and evaluate the efficiency of some prophylactic antenatal approaches of
retained after birth in dairy cows.
The experiment was performed on 150 pregnant Friesian-Holstein and crossbred cows, 3 - 7 year old belonging to a farm at Fakous-Sharkia
Province.
The study was done during the period from September 1989 to January 1993. All cows having apparentally good condition, and were houred under the same system of management and nutrition.
The eligible cows were about one month before the expected date of parturition. These cows under investigation were randomly divided into 5
groups.
Group I: did not have any injection and served as control.
Group II: was given IM injections of Dexamethasone, 5 mg then repeated 15 days later.
Group III: was injected IM with 5 mg estradiol benzoate about one month before the expected date of birth then repeated 15 days
later.
Group IV: Each animal was given 5 mg estradiol benzoate and 5 mg Dexamethasone then repeated 15 days later.
Group V: was given IM injections of 2.5 mg of estradiol benzoate and 10 ml turline AD3E then repeated 15 days later.
The results indicate that the rate of dropped placenta was 70.0% for the control group compared to 80%, 86.7%, 90% and 83.3% for Dexamethasone, Estradiol, Dexamethasone with Estradiol and Estradiol with vitamin AD3E treated group respectively. The mean time from
parturition to expulsion of the fetal membranes was significantly shorter for the group treated with simultaneous injection of Dexamethasone and Estradiol (3.63 ± 0.22 hours) compared to the control group (6.74 ± 0.50 hours), Dexamethasone treated group (4.35 ± 0.23 hours), Estradiol treated group (3.92 ± 0.24 hours) and. Estradiol with vitamin AD3E treated
group (4.80 ± 0.24 hours).
Overall, it could be deduced that simultaneous injection of estradiol, vitamin AD3E and dexamethasone according to the
aforementioned regimen seems useful, satisfactory, less labour-consuming and easily applicable procedure for reducing the retained fetal membrane syndrome in dairy cows.