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

Controlling the breeding season using melatonin and progestagen in Kivircik ewes

Melatonin ve progestagen sponj uygulamalarının birlikte ve ayrı ayrı üreme mevsimi başlangıcında kullanımlarının Kıvırcık koyunlarda reproduktif performans. üzerine etkileri araştırıldı. 22 Haziranda, anöstrusta ve laktasyonda olmayan 40 koyuna melatonin (Regulin) implantlar uygulandı. Bu koyunların 20 tanesine ve başka 20 koyuna 14 Temmuzda Progestagen (Synchron) sponj yerleştirildi. 14 gün sonra sponjlar çıkarıldı ve 600 l.Ü pregnant mare serum gonadotropin (PMSG) verildi. 20 koyun ise kontrol olarak bırakıldı. 28 Temmuzda bütün koyunlara koç katıldı. Yavrulama oranı sırasıyla melatonin, progestagen + PMSG, melatonin + progestagen + PMSG ve kontrol gruplarında, % 85, % 90, % 95 ve % 75, ikizlik oranları ise sırayla % 52,9, % 73,7, % 61,1 ve % 43,6 olarak bulundu. Doğumlar koç katımından sonraki 156 ± 6,24, 153 ± 6,07, 155 ± 7,33 ve 164 ± 12,03 günlerde gerçekleşti ve doğumların tedavi gruplarında 17,66 ± 3,51 gün, kontrol grubunda 33,07 ± 2,25 günlerde yoğunlaştığı gözlendi. Koyun başına düşen canlı yavru sayısı sırasıyla l ,47 ± 0,51, 1,44 ± 0,51, l ,47 ± 0,61 ve l ,43 ± 0,50 olarak tespit edildi. Sonuç olarak üreme mevsimi başlangıcında, anöstrus koyunlarda, melatonin ve progestagen tedavileri ayrı ayrı veya birlikte kullanıldığında kuzulama oranını artırmakta ve doğumları toplulaştırmakta ve üreme mevsimi kontrol altına alınabilmektedir. Bunun yanında Melatonin ve melatonin + progestagen + PMSG uygulamaları, klasik progestagen + PMSG uygulamalarına bir alternatif olarak düşünülebilinir.

Melatonin ve progestagen uygulamaları ile Kıvırcık koyunlarda üreme mevsiminin kontrolü

The effect of melatonin and progestagen sponge administrations separately and together on the reproductive performance at the onset of the breeding season were investigated in Kıvırcık ewes. On June 22, to 40 anoestrous and non-lactating ewes were administrated melatonin (Regulin) implants. On July 14, progestagen (Synchron) sponges were inserted in 20 of these ewes and in 20 other ewes. They were removed 14 days later and on the day of removal the ewes were given 600 I.D. pregnant mare's serum gonadotrophin (PMSG). The other 20 ewes served as controls. Rams were introduced on July 28. The lambing percentages of the ewes in the melatonin, progestagen + PMSG, melatonin + progestagen + PMSG and control groups were 85% , 90% , 95% and 75% and the twinning rates were 52.9% , 73.7%, 61.1% and 43.6%, respectively. Lambing days after ram introduction were 156 ± 6.24, 153 ± 6.07, 155 ± 7.33 and 164 ± 12.03 days in the melatonin, progestagen + PMSG, combined and control groups, and lambings were more condensed on 17.66 ± 3.51 days in the treatment groups and 33.07 ± 2.25 days in the control group. The mean numbers of live born lambs per ewe were 1.47 ± 0.51, 1.44 ± 0.51,1.47 ± 0.61 and 1.43 ± 0.50, respectively. We conclude that melatonin and progestagen treatments separately and together at the onset of the breeding season may advance and condense the rates of lambing and the breeding season can be controlled by these treatments. In addition, melatonin treatment may be a viable alternative to traditional hormonal techniques using progestagen and PMSG.

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