Laktasyondaki İneklerde Tohumlama Anında Azaltılan GnRH Dozunun Gebelik Oranı Üzerine Etkisi

Year 2017, Volume: 6 Issue: 1, 46 - 50, 30.06.2017

Ramazan Sertkol Mustafa Kemal Sarıbay

Abstract

Çalışma
laktasyondaki ineklerde tohumlama anında uygulanan GnRH dozunun yarıya
indirilmesinin gebelik oranı üzerine etkisini belirlemek amacıyla yapıldı. Araştırmada yaşları 3-6 arasında
değişen, postpartum 80-120 günler arasında olan ve klinik olarak herhangi bir
reprodüktif probleme rastlanılmayan 50 Holstayn ırkı inek kullanıldı. İneklerin
östrüs göstermeleri için herhangi bir hormonal uygulama yapılmadı. Çalışma
süresince östrüs belirtileri gösteren ineklerin ovaryum muayeneleri 6-8 MHz
lineer problu real-time ultrason  ile
yapıldı ve ovaryumdaki mevcut foliküllerin çapı kaydedildi. Daha sonra bir
gruba (grup I,  n=25) suni tohumlama (ST)
anında bir gonadotropin
salgılatıcı hormon (GnRH)
analoğu olan Buserelin asetat (Receptal^®, İntervet) 2.5 mL kas içi
uygulandı.  Diğer
gruba (grup II, n=25) ise ST anında 1.25 mL Buserelin asetat kas içi uygulandı.
Folikül çapları grup
I ve II’de sırasıyla 12.28±0.37 mm, 12.24±0.44 mm olarak kaydedildi. Gebelik
oranları grup I ve II’de sırasıyla %80 (20/25), %72 (18/25) olarak belirlendi
(P>0.05). Sonuç olarak, ineklerde gebelik oranlarının artırılması amacıyla
ST sırasında uygulanan GnRH’nın dozunun yarıya indirilmesinin gebelik
oranlarını etkilemediği görüldü.

Keywords

İnek, GnRH, Gebelik oran

The Effect of Reduced Dose of GnRH Administered at the Time of Insemination on Pregnancy Rate in Lactating Dairy Cows

Abstract

This study was carried out to determine
the effect of reducing half dose of GnRH performed immediately at the time of
artificial insemination on pregnancy rate in lactating dairy cows.  The study was conducted on 50 Holstein cows
aging between 3-6 years old, and on 80-120 days postpartum without reproductive
problems. No hormonal application was
carried out for ensuring estrous in cows. The ovarian examinations of the cows
showing estrous symptoms were performed by real-time ultrasound with 6–8
MHz lineer probe and the diameters of the follicles were recorded. The cows in
Group I (n=25), a gonadotropin releasing
hormone (GnRH) analogue,
buserelin acetate (Receptal^®, İntervet) recieved 2.5 ml of GnRH intramucularly  just at the time of artificial
insemination. Group II recieved 1.25 mL of GnRH,
intramuscularly immediately at
the same time.  The diameters of
follicles at the time of inseminations were detected as 12.28±0.37 mm, 12.24±0.44 mm in the group I and
group II respectively. The pregnancy rates were 80% (20/25) and 72% (18/25), in
group I and group II respectively (P>0.05). It was concluded that reducing
the half dose of GnRH, which is performed to increase the pregnancy rate in
cows immediately at the time of insemination, did not affect the pregnancy
rate.

Keywords

Cow, GnRH, Pregnancy rate

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