Effect of prostaglandin F2α dosage and route of administration on estrus induction in remanov crossbred ewes during the end of breeding season
Abstract: Romanov crossbred ewes (n = 35) aged 22 months and weighing 40 kg live body weight were used to determine the influence of prostaglandin F2α (Cloprostenol) dosage and route of administration on proportion of ewes showing estrus, interval to estrus, duration of estrus, conception rate and litter size. Ewes were randomly assigned. to five groups (each of seven). Group I was intramuscular (1M) injected with 250 /lg Cloprostenol (PGF2a). Groups 2, 3 and 4 were received 100 /1g cloprostenol per ewe, administrated either deep cervical (DC), intravulvo-submucosa (IYSM) or intravenous (IV), respectively, while G5 was served as control without any hormonal treatment. Ewes didn't show estrus after the first PGF2α treatment, they were retreated with a second dose, 10 days apart, by the same route of PG administration. Ewes of groups 1, 2 and 4 were intramuscular injected with 450 lU pregnant mare serum at the 2nd PG treatment while the 3rd group was intramuscular injected with 4 μg GnRH at the beginning of estrus. Ewes were observed three times daily for signs of behavioural estrus over 5 days Percentage. of ewes exhibiting estrus within 23 to 32 .7 hrs following the application of prostaglandin via IVSM or IV was similar (100%) and higher than those [IM] injected (83.7%). DC (50%) or untreated ewes (28.6%) The time elapsed from treatment to estrus was significantly shorter (P < 0.05) in IVSM ewes (36.9 hrs) compared with 40.6 hrs in IV; 44.7 hr in DC and 47.7 hrs in 1M group The corresponding duration of the induced estrus was 23.1, 32.7. 41.3 and 34 hrs, respectively responded ewes were mated and observed for estrus 25 days post insemination. The lambing rate was higher in IVSM ewes than the other treated groups. The present study, indicated that 100 μg cloprostenol administration via IVSM route should be an effective method for estrus synchronization and improved lambing rate in Romanov crossbred ewes.
Publication year 2003
Availability location معهد بحوث الانتاج الحيوانى-7 شارع نادى الصيد- الدقى - الجيزة
Availability number
Organization Name
City طنطا
serial title Journal Agricultural Research Tanta University
Author(s) from ARC
External authors (outside ARC)
    ابراهيم سعد الشماع جامعة طنطا
    ابراهيم محمود عبد الرازق جامعة طنطا
Agris Categories Animal physiology - Reproduction
AGROVOC
TERMS		 Administration. Breeding seasons. Crossbreds. Ewes. Prostaglandins. Reproductive performance.
Publication Type Journal
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