Pregnancy Rate in Synchronized Iraqi Awassi Ewes Inseminated Artificially and Naturally
Keywords:Ewe, Artificial insemination, Natural mating, Frozen semen.
This study was carried out to evaluate the efficacy of imported Australian frozen semen straws in
achieving successful artificial insemination program in estrus synchronized ewes. This study conducted
on twenty-one Awassi ewes, aged 2 - 4 years, and four fertile rams (two rams for natural mating and two
for detecting of estrous by using apron) in Baghdad province (Rumintia Research station, department
of animal resource research, state Board for Agriculture Research, Ministry of Agriculture/ Abu
Ghraib district), for the period from November 2020 to March 2021. Pregnancy diagnosis was done
by ultrasound to detect reproductive status of the ewes, then all non-pregnant ewes were synchronized
by using vaginal sponges (60 mg of Medroxy acetate Progesterone / MAP) for 10days plus 500IU of
Pregnant Mare Serum Gonadotropin (PMSG) in day 10, all animals were divided randomly into three
equal groups each of seven ewes according to the type of insemination, G1 (1straw) and G2 (2 straws/
8 hrs. interval) and G3 serviced naturally by fertile rams then the females were isolated from the males.
The response of animals to hormonal treatment was 21, with a response rate of 100% in all groups with
no significant difference with mean durations of response recorded 63.6± 11.7, 66.7± 12.2, and 62.8±
10.7 for the three groups, respectively. The pregnancy rate with single, double AI and natural mating
was 41.86 and 71.41 and 71.42 percent, respectively with a highly significant difference (P<0.01)
between G1 and G2. In conclusion, under field conditions, double AI with 20 ×106 sperm proved to be
suitable for generating high pregnancy rates in Iraqi Awassi ewes.
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