Kemal AK, Cumhur SÖNMEZ, Serhat ALKAN, Huriye HOROZ, Güven KAŞIKÇI

Kısraklarda üreme mevsiminin farklı dönemlerinde vaginal progesteron uygulamalarının fertilitiye etkisi

Çalışmada kısraklarda üreme mevsiminin farklı dönemlerinde vaginal progesteron uygulamalarının östrus ve ovulasyonun uyarılmasına etkisi araştırıldı. Tedavi gününe kadar östrus göstermeyen 8-20 yaş arasında en az bir yıl gebe kalmamış 136 safkan İngiliz kısrak kullanıldı. Kısraklara 14 gün süreyle vaginal progesteronve progesteron uygulamasının bittiği gün (0. gün) tek doz PGF2a uygulandı. Uygulamalar 15 Şubat-15 Mart (n=59), 16 Mart-16 Nisan (n=49) ve 17 Nisan-30 Mayıs (n=28) tarihlerinde yapıldı. Tedavi sonrası uygulama zamanı ilerledikçe istatistiksel olarak önemsiz de olsa ortalama östrus günü (3.54 ± 2.98; 2.90 ± 2.47; 1.89 ± 1.25 gün) ve ovulasyon günü (5.52 ± 3.62; 5.19 ± 2.79; 4.32 ± 2.09 gün) azaldı ve östrus gösterme oranı (%71.19; %85.71; %96.55) arttı. Yine uygulama zamanına göre sırasıyla; gebelik oranlan %35.6; %42.6; %65.5 ve tedaviye cevap vermeyen kısrakların oranı %28.8; %14.3, %3.4 oldu. 17 Nisan sonrası tedaviye alınan grupta gebelik oranı arttı ve tedaviye cevap vermeyen kısrakların oranı azaldı (P

Effects of intravaginal progesterone administration on fertility in mares during different periods of the breeding season

The effect of season on the induction of estrus and ovulation by vaginal progesterone at different stages of the breeding season was investigated in the study. Total 136 purebred English mares at between 8-20 age that had no estrus untill the treatment day and have not been pregnant for at least a year were used. Vaginal progesteron was administered to the mares for 14 days and a single dose of $PGF_{2/alpha}$ was injected at the withdrawal day.The administrations were done between 15 February- 15 March (n=59), 16 March- 16 April (n=49), and 17 April 30 May (n=28). At the end of the treatment estrus and ovulation were observed in 81.75% of mare^ in 2.89 ± 2.51 and 5.09 ±3.0 days respectively, 44.52 % of these mares conceived. Better results were scored in later months after February. In later months there have been a decrease in post-treatment estrus (3.54 ± 2.98; 2.90 ± 2.47; 1.89 ± 1.25 days) and ovulation (5.52 ± 3.62; 5.1 ± 92.79; 4.32 ± 2.09 days) days and an increase in estrus rates (71.19 %; 85.71%; 96.55%) and pregnancy rates (35.6 %; 42.6 %; 65.5 %). A marked decrease was observed in the rate of mares that have not responded treatment between 17 April-30 May (3.4%) relating to the other months (28.8%; 14.3%) (P

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