Progesterone concentrations and pregnancy rates of repeat breeder cows following postinsemination PRID and GnRH treatments

Bu çalışmada, repeat breeder ineklerde tohumlama sonrası progesteron uygulamalarının ve progesteron üretimini stimüle eden GnRH enjeksiyonunun serum progesteron konsantrasyonu ve gebelik oranları üzerine etkileri araştırıldı. Grup 1’deki hayvanlara tohumlamayı izleyen 12. günde GnRH enjeksiyonu yapıldı. Grup 2’deki hayvanlara tohumlama sonrası 4-11. günler arası PRID uygulandı. Grup 3’deki hayvanlara ise tohumlama sonrası 11-18. günler arası PRID uygulaması yapıldı. Tüm hayvanlardan uygulama günü, uygulama gününü izleyen 7. gün ve suni tohumlamayı izleyen 21. günde progesteron analizi için kan örnekleri toplandı. Kontrol grubundaki hayvanlara ise herhangi bir uygulama yapılmadı. Bu gruptaki ineklerden progesteron ölçümü için düzenli olarak kan örnekleri toplandı. Gebelik oranları; grup 1’de % 20, grup 2’de % 26,6, grup 3’de % 40 ve kontrol grubunda % 20 olarak hesaplandı. Uygulamayı izleyen 7. gündeki progesteron değerlendirmelerinde, grup 1 ve grup 3’deki progesteron konsantrasyon artışının kontrol grubuna oranla istatistiksel olarak önemli olduğu belirlendi (P < 0,05). Sonuç olarak, tedavi gruplarındaki uygulama girişimlerinin, materyal olarak alınan repeat breeder ineklerde endogen progesteron hormonu düzeylerini yükseltmesine rağmen, gebe kalma oranları üzerinde istatistiksel anlamda önemli bir etkisi olmadığı görüldü.

Tohumlamayı izleyen farklı günlerde PRID ve GnRH uygulanan repeat breeder ineklerde progesterone konsantrasyonları ve gebelik oranları

The objective of this study was to determine the effects of progesterone (PRID) application and gonadotropinreleasing hormone (GnRH) injection after artificial insemination on serum progesterone concentration and pregnancy rates in repeat breeder cows. In group 1, repeat breeder cows received an injection of GnRH on day 12 after artificial insemination. In group 2, repeat breeder cows received PRID from day 4 to day 11; group 3 received PRID from day 11 to day 18. Blood samples were obtained from all treated cows to assay serum progesterone concentrations on application days, 7 days after application, and 21 days aft er artificial insemination. In the control group repeat breeder cows did not receive any treatment. Blood samples were obtained from all control repeat breeder cows periodically after artificial insemination. Pregnancy rates were 20% in group 1, 26.6% in group 2, 40% in group 3, and 20% in the control group. Serum progesterone concentrations were significantly higher in group 1 and group 3 (P < 0.05) than the control group, 7 days after application. Application of PRID and GnRH after artificial insemination did not significantly improve pregnancy rates, despite the fact that serum progesterone concentrations were higher in treatment groups.

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