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Effect of season and mating system in Awassi ewes superovulated with FSH on fertilization rate and embryo recovery

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Author(s): O. I. Azawi | M. K. M. A. Al-Mola

Journal: Iraqi Journal of Veterinary Sciences
ISSN 1607-3894

Volume: 24;
Issue: 2;
Start page: 75;
Date: 2010;
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Keywords: Sheep | Superovulation | FSH | Embryo recovery | Awassi breed

ABSTRACT
The aim of the present study was to evaluate the contribution of laparoscopic intrauterine insemination to the improvement of fertilization and embryo recovery in Awassi ewes superovulated with FSH in breeding and non-breeding season. Twelve nonpregnant and cycling Awassi ewes of 3-4 years of age were randomly allocated in equal numbers (n = 6) to two groups. Each ewe was treated with a progesterone impregnated intravaginal sponge for 12 days. All ewes were superovulated with FSH in eight reducing doses for four days in the morning and evening from two days prior to sponge withdrawal. Ewes of group 1 were mated naturally at least two times with Awassi rams of proven fertility. Ewes of group 2 had intrauterine insemination and were conducted 44-46 h after sponge removal, under laparoscopic visualization of uterine horns, depositing 1 ml of semen in the distal portion of each uterine horn. Ovarian response was assessed by determining number of corpora lutea by laparoscopy on day 6 after mating. Embryo recovery was performed by hand assisted laparoscopy and by flushing both uterine horns. Ovarian response of the ewes superovulated with FSH was decreased to half in the non-breeding season. High number of unfertilized ova (P
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