Effect of GnRH Treatment During/After Insemination for Increasing Fertility of Dairy Cows

Öz

The most important problem in dairy farms is that optimal conception rates cannot be obtained from artificial inseminations. Optimal conception rates cannot be obtained due to ovulation problems and early/ late embryonic losses. Therefore, different hormones and strategies are conducted in the solution process. One of these hormones, which is gonadotropin-releasing hormone (GnRH), is widely used during and / or after artificial insemination. It is aimed to prevent / reduce delay in ovulation or anovulation with GnRH that is administrated during artificial insemination. When GnRH is administrated on different days, progesterone level is increased, therefore it is aimed to prevent/ reduce early/ late embryonic losses. According to obtained results, it can be stated that conception rate has been increased after both administrations. In addition, it is stated that GnRH hormone has many vital advantages such as its practical applicability, common availability, no side effects and no residue in meat / milk. Therefore, GnRH treatment can always be suggested during / after artificial insemination due to the effects on conception. This review summarizes the effects of GnRH, which is conducted during and / or after artificial insemination, on fertilization has been indicated.

Anahtar Kelimeler

• After artidical inseminations
• Dairy Cow
• During artifical inseminations fertility
• GnRH

Sütçü İneklerde Döl Veriminin Artırılmasına Yönelik Tohumlama Sırası/Sonrası GnRH Uygulamaları

Öz

Süt sığırcılığı işletmelerinde en önemli sorun, suni tohumlamalardan optimal gebe kalma oranlarının elde edilememesidir. Optimal gebe kalma oranı başlıca ovulasyon mekanizmasındaki aksaklıklar ve erken/geç embriyonik ölümler nedeniyle elde edilememektedir. Bu sorunun çözümünde ise değişik hormonlar ve stratejiler uygulanmaktadır. Bu hormonlardan gonadotropin salgılatıcı hormon (GnRH) suni tohumlama sırası ve/veya sonrasında yaygın olarak kullanılmaktadır. Suni tohumlama sırasında uygulanan GnRH ile ovulasyonun gecikmesi veya anovulasyon gibi durumların engellenmesi/azaltılması amaçlanmaktadır. Suni tohumlama sonrasında ise değişik günlerde uygulanan GnRH ile progesteron seviyesi yükseltilerek, erken/geç embriyonik ölümlerin önlenmesi/azaltılması amaçlanmaktadır. Elde edilen sonuçlara göre her iki uygulama sonrasında gebe kalma oranının arttığı belirtilmektedir. Buna ilaveten, pratik uygulanabilirliği ve kolaylıkla temin edilebilmesi, bilinen yan etkilerinin ve et/sütte kalıntı sorununun olmaması önemli avantajları olarak kabul edilmektedir. Dolayısıyla her bir gebelik çok büyük değer taşıdığı için, GnRH uygulaması suni tohumlama sırasında/sonrasında her zaman önerilebilir. Sunulan derlemede suni tohumlama sırasında ve/veya sonrasında GnRH uygulamasının döl verimi üzerine yaptığı katkı değerlendirilmiştir.

Anahtar Kelimeler

• Fertilite
• GnRH
• İnek
• Suni tohumlama sırası
• Suni tohumlama sonrası

Kaynakça

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