İneklerde Tohumlama Esnasındaki Bazı Östrus Belirtilerinin Yaş ve Gebe Kalma Oranı ile İlişkisi

Öz

Sunulan araştırmada saha şartlarında östrus gösteren ineklerde gebelik üzerine tohumlama esnasındaki bazı östrus belirtilerinin yaşa göre etkisini karşılaştırmak amaçlanmıştır. Bu çalışmada 96 Holştayn inek kullanıldı, bazı östrus bulguları gözle muayene ve klinik testlerle değerlendirildikten sonra tüm ineklere dondurulmuş-çözdürülmüş sperma ile suni tohumlama yapıldı. Bütün hayvanlarda dominant follikülün soldan (%38.54) çok sağ (%61.46) ovaryumda yerleştiği ancak yerleşimin gebelik oranı üzerine etkisinin gözlenmediği belirlendi (p<0.01). Bununla beraber, bütün hayvanlarda gebelik oranları ile vaginal sıcaklıklar (r=0.661, P<0.05) ve mukus kristalizasyonu (r=0.732, P<0.01) ayrıca mukus kristalizasyonu ile dominant follikül büyüklükleri ve vaginal sıcaklıklar arasındaki (P<0.05) pozitif yöndeki ilişkiler önemli bulundu. Bununla birlikte önemli derecede (P<0.01) yüksek gebelik oranları 4 ile 7 yaş arasındaki 14-18 mm arasında follikül çapına sahip kendiliğinden östrus gösteren ineklerin tohumlanmalarıyla elde edildi. Sonuç olarak, vaginal sıcaklık ile mukus kristalizasyonu yüksek ve orta büyüklükte folliküle sahip olan 4-7 yaşlı ineklerin tohumlanmalarıyla gebelik şansı yüksek bulunduğundan dominant follikül büyüklüğü ve mukus kristalizasyonun yaş ile birlikte değerlendirilerek tohumlama zamanının ayarlanmasıyla gebelik şansının arttırılabileceği kanaatine varıldı.

Anahtar Kelimeler

• Yaş,İnek,Tohumlama,Östrus,Gebelik

Relationships Age and Pregnancy Rates with Certain Oestrus Characteristics at the Insemination Time in Holstein Cows

Öz

The study was conducted to compare the age with respect to some oestrus signs on pregnancy success in spontaneously oestrus signed 96 Holstein cows under field conditions. Some oestrus findings were examined by visual observation and some clinical tests then all cows were artificially inseminated by frozen-thawing semen. The dominant follicle was located more often (P<0.01) on the right (61.46%) than the left ovary (38.54%) in all animals, but there was no effect of location of the ovulatory follicle on the pregnancy rate. However, it was observed positive correlations between pregnancy rates and vaginal temperatures (r=0.661, P<0.05), and the ferning of cervical mucus (r=0.732, P<0.01), and also between the ferning of cervical mucus and OFS, and vaginal temperatures (P<0.05) in all animals. In addition, the significantly (P<0.01) high pregnancy rates were achieved in spontaneously oestrus occurred 4-7 years aged cows that ovulatory follicle sizes (OFS) were ranged from 14 mm to 18 mm. It was concluded that should be oestrus signs evaluated together with age, OFS and ferning of cervical mucus why pregnancy success were bigger in cows whose vaginal temperature and ferning of cervical mucus were maximum and OFS was moderate, pregnancy chance may be improved by means of optimizing insemination time in 4-7 years olded cows.

Anahtar Kelimeler

• Age,Cow,ınsemination,Oestrus,Pregnancy

Kaynakça

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