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Oestrus synchronization and fertility in romanov crossbred ewes using GnRH and PGF₂a [electronic resource].

By:

Sallam, A. S

Contributor(s):

Language: English Summary language: Arabic Description: p.575-586Other title:

تنظيم الشياع والخصوبة فى نعاج الرومانوف الخليط باستخدام الهرمون المحرر للجردنادوترفينات والبروستاجلاندين F₂a [Added title page title]

Uniform titles:

Journal of agricultural research Tanta University, 2004 v.30 (3) [electronic resource].

Subject(s):

Ewes -- Fertility

Online resources:

Full Text Article

In: Journal of Agricultural Research Tanta Univeristy 2004.v.30(3)Summary: Sixty Romanov crossbred ewes aged 2.5-3 years and weighing 40-50 kg, were used to compare three method of estrus synchronization. The ewes were divided randomly into three similar groups. The first group (PFP) received intravenous two injections each of 125 μg PGF2a (cloprostenol-estrumate) II d apart and a single intravenous injection of20 flg GnRH (Fertagyl) 5 d prior to the second PGF2a injection. The second group (PF) was given intravenous 20 μg Fertagyl followed 5 days later by intravenous injection of 125 μg cloprostenol. The third group (PP) was intravenous injected with 250 μg cloprostenol, 11 d apart, and served as control. All ewes were naturally inseminated (NI) on observed standing estrus or on fixed time 72-80 hrs after the 2nd PGF₂a administration if ewes that failed to display standing estrus. Pregnancy was diagnosed 50 d post Nl using ultrasonic technique. The percentage of exhibition estrus was 55.0; 36.8 and 16.7% for the PFP; FP and PP treatments, respectively. The synchronized pregnancy rate by ultrasonic technique was 54.6; 71.4 and 100% for ewes displayed standing estrus in different three treated groups (PFP; FP and PP, respectively), while it was 44.4, 25.0 and 0.0% for ewes inseminated at fixed time in the corresponding three groups. The lambing rate was 45.0; 52.6 and 16.7% and the litter size was 1.89. 1.3 and 1.0 in PFP; FP and PP treatments. respectively.

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Sixty Romanov crossbred ewes aged 2.5-3 years and weighing 40-50 kg, were used to compare three method of estrus synchronization. The ewes were divided randomly into three similar groups. The first group (PFP) received intravenous two injections each of 125 μg PGF2a (cloprostenol-estrumate) II d apart and a single intravenous injection of20 flg GnRH (Fertagyl) 5 d prior to the second PGF2a injection. The second group (PF) was given intravenous 20 μg Fertagyl followed 5 days later by intravenous injection of 125 μg cloprostenol. The third group (PP) was intravenous injected with 250 μg cloprostenol, 11 d apart, and served as control. All ewes were naturally inseminated (NI) on observed standing estrus or on fixed time 72-80 hrs after the 2nd PGF₂a administration if ewes that failed to display standing estrus. Pregnancy was diagnosed 50 d post Nl using ultrasonic technique. The percentage of exhibition estrus was 55.0; 36.8 and 16.7% for the PFP; FP and PP treatments, respectively. The synchronized pregnancy rate by ultrasonic technique was 54.6; 71.4 and 100% for ewes displayed standing estrus in different three treated groups (PFP; FP and PP, respectively), while it was 44.4, 25.0 and 0.0% for ewes inseminated at fixed time in the corresponding three groups. The lambing rate was 45.0; 52.6 and 16.7% and the litter size was 1.89. 1.3 and 1.0 in PFP; FP and PP treatments. respectively.

Summary in Arabic.

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