Journals / Veteriner Bilimleri Dergisi . Eurasian Journal of Veterinary Sciences / 2004 / Cilt: 20 - Sayı: 2

The effect of GnRH administration after insemination on fertility of pubertal heifers synchronized with $PGF _{2 alpha}$

$PGF _{2 alpha}$ ile östrusları senkronize edilen düvelerde tohumlama sonrası uygulanan GnRH'nın fertilite üzerine etkisi

Pages
47–52
DOI
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⚡ TL;DR(Too Long; Didn't Read)

These results indicate thai there was a significant decrease in conception rate at first service for pubertal heifers synchronized with PGF2a.

📌 3 Key Takeaways

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Objective & Hypothesis:The objectives of this study were conducted to compare pregnancy rates of pubertal heifers inseminated at natural estrus and senchronized estrus with PGF2«, and to determine whether the positive effect of GnRH administrations after insemination on fertility of pubertal heifers.
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Key Findings & Data:A total of 114 pubertal heifers at the age of 11-13 months were used.
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Conclusion & Impact:These results indicate thai there was a significant decrease in conception rate at first service for pubertal heifers synchronized with PGF2a.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:suni tohumlama · GnRH · düve

Abstract

The objectives of this study were conducted to compare pregnancy rates of pubertal heifers inseminated at natural estrus and senchronized estrus with PGF2«, and to determine whether the positive effect of GnRH administrations after insemination on fertility of pubertal heifers. A total of 114 pubertal heifers at the age of 11-13 months were used. Heifers were randomly allocated to four groups. Pubertal heifers in Group NE (n=29) and Group NE+G (n=28) were inseminated artificially approximately 12 h after the onset of natural estrus. Pubertal heifers in Group SN (n=29) and Group SN+G (n=28) were synchronized using two injections of 0.5 mg cloprostenole (Estrumate®) given 11 d apart and were observed from 36 to 108 h after second injection of PGF2«- They wqre inseminated artificially approximately 12 h after detection of estrus. In addition, heifers in Group NE+G and group SN+G were given 0.1 mg gonadorelin (Ovarelin®) immediately after insemination. Heifers were observed for estrus between 19 and 21 d after insemination. Estrus rate of sencronized pubertal heifers was determined as 78.9%. First service conception rate was observed to be significantly lower (P=0.011) in heifers in group SN than the heifers in group NE (45.8% vs 79.3%). Although sencronized pubertal heifer treated with GnRH (group SN+G) showed a increase in pregnancy rate compared with group SN, there was no significant difference (P=0.083) in conception rate between group SN+G and Group SN (71.4% vs 45.8%). These results indicate thai there was a significant decrease in conception rate at first service for pubertal heifers synchronized with PGF2a. However, GnRH given after insemination to senchronized pubertal heifers might affect positively on fertility, though it did not significantly increase conception rate.

Özet

Bu çalışma, PGF20C ile senkronize edilerek tohumlanan pubertal düvelerle doğal östruslarında tohumlanan pubertal düvelerin gebelik oranlarını karşılaştırılmak ve bu hayvanlara tohumlamadan hemen sonra GnRH uygulanmasının fertilite üzerine olumlu bir etkisinin olup olmadığını belirlemek amacıyla yapıldı. Araştırmada, materyal olarak yaşları 11-13 ay arasında değişen, 114 düve kullanıldı. Düveler tesadüfi olarak 4 gruba ayrıldı. Grup NE (n=29) ve grup NE+G (n=28)'deki düveler doğal östruslarında kızgınlık belirtilerinin tespitinden yaklaşık 12 saat sonra tohumlandı. Grup SN (n=29) ve grup SN+G (n=28)'deki düvelere ise 11 gün arayla 2 kez 0.5 mg cloprostenole (Estrumate®) uygulanarak östrusları senkronize edildi. Hayvanlar ikinci enjeksiyonu takip eden 36-108. saatler arasında kontrol edilerek kızgınlığın tespit edilmesinden yaklaşık 12 saat sonra tohumlandı. Tohumlamadan hemen sonra grup NE+G ve grup SN+G'deki düvelere 0.1 mg gonadorelin (Ovarelin®) enjekte edildi. Yapılan çalışmada, senkronize edilen pubertal düvelerde östrus görülme oranı %78.9 olarak belirlendi. Senkronize edilerek tohumlanan düvelerin gebelik oranında (%45.8), doğal östruslarında tohumlanan düvelerin gebelik oranına (%79.3) göre önemli bir azalma olduğu (P=0.011) tespit edildi. Senkronize edilen hayvanlara tohumlamadan hemen sonra GnRH uygulanması (Grup SN+G) sonucu elde edilen gebelik oranı (%71.4), GnRH uygulanmayan senkronize edilmiş düvelerin (Grup SN) gebelik oranlarına göre (%45.8) artış göstermesine rağmen aradaki fark istatiştiki olarak önemsiz (P=0.083) bulundu. Sonuç olarak, PGF20C ile senkronize edilen pubertal düvelerde ilk tohumlama sonucu elde edilen gebelik oranı azalmıştır. Bununla birlikte, senkronize edilen pubertal düvelere tohumlamadan hemen sonra GnRH uygulanması gebelik oranını önemli derecede artırmamasına rağmen fertiliteyi olumlu yönde etkileyebilir.

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Cite This Article

SÖNMEZ, M., GÜR, S. (2004). The effect of GnRH administration after insemination on fertility of pubertal heifers synchronized with $PGF _{2 alpha}$. Veteriner Bilimleri Dergisi . Eurasian Journal of Veterinary Sciences, Cilt: 20 - Sayı: 2, 47–52. https://ajindex.com/articles/333319

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