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Efficacy of ovulation synchronization with GnRH and pgf2a in subfertile dairy cows [electronic resource].

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Hussein, H. A

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Language: English Summary language: Arabic Description: p.280-292Other title:

كفاءة استخدام الهرمون المحرر للحاثة المنسلية و هرمون البروستاجلاندين في توافق الشبق في الابقار الحلابة منخفضة الخصوبة [Added title page title]

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Assiut veterinary medical journal, 2004 v. 50 (101) [electronic resource].

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In: Assiut Veterinary Medical Journal 2004.v.50(101)Summary: The object of this study is to evaluate protocols for synchronizing ovulation in dairy cows suffering from some infertility problems. In this experiment, dairy cows with open period between 120 and 250 days at random stages of estrus cycle were assigned to one of the following treatments: Group I (n = 6) received GnRH agonist (buserelin in Day 1), PGF2a (cloprostenol in Day 7) and GnRH agonist (Day 9) then blindly mated within 24h after the second GnRH injection. In Group II (n = 6), one GnRH agonist was applied (Day 1) then PGF2a (Day 7) then was mated at observed estrus. While group III (n = 6) remained without treatments and mated at observed estrus. Three weeks before treatment, the ovarian changes were monitored twice weekly by trans-rectal, B¬mode ultrasonography. After the beginning of the program, the examination was undertaken daily until mating. Pregnancy was determined by ultrasonography and rectal palpation 30 to 45 days after natural mating. In the treated groups, the percentage of animals detected in heat was 3/6 (50 %) and 6/6 (100 %) for group I and II, respectively. The conception rate reached 66.6 % (4/6) in group I and 50.0 % (3/6) in group II. The percentage of animals in control group (group III), which conceived after mating during the experiment was 33.3 % (2/6). Conception rate was higher in animals which were in the first half of the estrus cycle at the beginning of the programs. It was concluded that, in dairy subfertile cows, application of GnRH/PGF2a program was potentially effective to improve the conception rate. Key words: Ovulation synchronization, GnRH, PGF2a., Subfertile Cows, Conceptin Rate.

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The object of this study is to evaluate protocols for synchronizing ovulation in dairy cows suffering from some infertility problems. In this experiment, dairy cows with open period between 120 and 250 days at random stages of estrus cycle were assigned to one of the following treatments: Group I (n = 6) received GnRH agonist (buserelin in Day 1), PGF2a (cloprostenol in Day 7) and GnRH agonist (Day 9) then blindly mated within 24h after the second GnRH injection. In Group II (n = 6), one GnRH agonist was applied (Day 1) then PGF2a (Day 7) then was mated at observed estrus. While group III (n = 6) remained without treatments and mated at observed estrus. Three weeks before treatment, the ovarian changes were monitored twice weekly by trans-rectal, B¬mode ultrasonography. After the beginning of the program, the examination was undertaken daily until mating. Pregnancy was determined by ultrasonography and rectal palpation 30 to 45 days after natural mating. In the treated groups, the percentage of animals detected in heat was 3/6 (50 %) and 6/6 (100 %) for group I and II, respectively. The conception rate reached 66.6 % (4/6) in group I and 50.0 % (3/6) in group II. The percentage of animals in control group (group III), which conceived after mating during the experiment was 33.3 % (2/6). Conception rate was higher in animals which were in the first half of the estrus cycle at the beginning of the programs. It was concluded that, in dairy subfertile cows, application of GnRH/PGF2a program was potentially effective to improve the conception rate. Key words: Ovulation synchronization, GnRH, PGF2a., Subfertile Cows, Conceptin Rate.

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