Ömer Orkun DEMİRAL, MURAT ABAY, ESRA CANOOĞLU, Rabia Gözde ÖZALP, ALİ RIŞVANLI

The combined effect of prostaglandin administration and ram introduction in multiparous and nulliparous sheep in anestrous period on prolificacy

Bu çalışmada, üreme sezonu dışında multipar ve nullipar Kangal Akkaraman ırkı koyunlarda koç katımı (koç etkisi) ve prostaglandin F2α (PGF2α) uygulaması kombinasyonunun etkinliğinin karşılaştırılması ve araştırılması amaçlandı. Koyunlar öncelikle, laktasyonda olmayan multipar (n=104, Grup M) ve nullipar (n=101, Grup N) koyunlar olmak üzere iki ana gruba ayrıldı. Daha sonra multipar ve nullipar koyunlar iki alt gruba ayrıldı. Grup MRP (n=50 multipar) ve Grup NRP ye (n=51 nullipar) koç katımının ilk günü, tek doz PGF2α enjekte edildi. Grup MR (n= 54) and NR (n= 50) ise PGF2α enjekte edilmeden sadece koç katımı yapılarak kontrol grubu olarak seçildi. Tüm gruplarda fertil, ergin ve safkan koçlar 45 gün süre ile sürüde kaldı. Kan progesteron düzeylerinin izlenmesi amacıyla her bir grup için oluşturulan subsetgruplardan (n= 17) 18 gün boyunca, üç gün aralıklarla kan alındı. Multipar ve nullipar hayvanlarda total kuzulama oranları sırasıyla %72.1 (75/104) ve %44.6 (45/101) olarak belirlendi (P

Anöstrus dönemindeki multipar ve nullipar koyunlarda koç etkisi ve prostaglandin uygulamalarının dölverimi üzerine kombine etkisi

In the study it was aimed to investigate and compare the combined efectiveness of ram introduction (ram efect) and prostaglandin F2 alpha (PGF2α) administration in multiparous and nulliparous Kangal White Karaman ewes during the out of breeding season. The ewes were frst divided into two main groups: non-lactating multiparous (Group M, n=104) and nulliparous (Group N, n=101). The multiparous and nulliparous animals were further divided in to two subgroups. Group MRP (n=50 multiparous) and NRP (n=51 nulliparous) were injected with a single dose of PGF2α on the first day of ram introduction. And the Group MR (n= 54) and NR (n= 50) served as controls with ram introduction but no PGF2α injection. In all of the groups, adult, purebred and fertile rams stayed with the ewes for 45 days. The blood samples were collected at 3-day intervals for 18 days after ram introduction from subsets of ewes (n=17 per group) to monitor the serum progesterone concentration. The total lambing ratios in multiparous and nulliparous animals were 72.1% (75/104) and 44.6% (45/101), respectively (P<0.001). Among the PGF2α and non-PGF2α subgroups of multiparous and nulliparous ewes, the lowest lambing rate was observed in Group NR (36.0%). In multiparous ewes (Groups MR and MRP), the mean progesterone level varied significantly among the days (P<0.001). In contrast, in Group NRP, the progesterone levels varied significantly over the tested time course (P<0.001), but no diferences were detected in Group NR (P>0.05). We concluded that being multiparous contributes to the success of PGF2α administration in combination with ram introduction in the anestrous period in ewes. Furthermore, PGF2α administration together with ram introduction positively afects the lambing rate in nulliparous ewes.

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