Sedat YILDIZ, Metehan UZUN, Fikret ÇELEBİ, ARMAĞAN ÇOLAK

Effects of prepubertal nutrition on birth ratio of tuj ewe-lambs induced to ovulate in the fırst breeding season

Bu araştırmanın amacı, dişi Tuj kuzularına doğdukları yıl farklı beslenme programlan uygulamak ve üreme sezonunun sonunda ovulasyonlarının uyarımını müteakip doğum oranını ortaya koymaktır. Bu amaçla 18 kuzu dört ayrı gruba ayrıldı ve 3-11. aylar arasında içerikleri farklı rasyonlarla beslendi. Diyetler, arpa (Grup I, n=5) by-pass yağ (Grup II, n=4), by-pass protein (Grup III, n=4) ve by-pass yağ ve by-pass protein (Grup IV, n=5) içermekteydi. Kuzular 12 aylık olduklarında 40 mg florogeston asetat emdirilmiş süngerler 13 gün kalacak şekilde intravajinal uygulandı ve süngerlerin çıkarıldığı gün her bir kuzuya 400 IU Gebe Kısrak Serum Gonadotropini kas içi uygulandı. Östrüs gösteren kuzular koçlarla çiftleştirildi. Doğum dönemi kuzular takip edilerek yavrulama oranlan belirlendi. Doğum oranı I, II, III ve IV. gruplarda sırası ile; % 60, 0, 100 ve 66 olarak belirlendi. Sonuç olarak Tuj kuzularının doğdukları yıl iyi bir besleme programı uygulanarak ve yumurtlamalan uyarılarak gebe kalmalarının sağlanabileceği ve yavru elde edilebileceği anlaşıldı. Ayrıca by-pass proteine dayalı rasyonun bu amaçla kullanılabilecek en uygun rasyon olduğu belirlendi.

Anahtar Kelimeler:

koyun ırkları, kuzulama oranı, kuzulama, diyetler, hayvan besleme, Tuj, progestojenler, beslenme

İlk üreme sezonunda ovulasyonları uyarılmış tuj kuzularının kuzulama oranı üzerine prepuberal beslemenin etkileri

The aim of this study was to evaluate different feeding regiments in Tuj ewe-lambs during the first year of their life and to determine rate of birth following ovulation induction at the end of the breeding season. Eighteen Tuj ewe-lambs were divided into four dietary groups and they were fed with the diets between the 3rd and 1 lth months of age. Diets consisted of barley (Group I, n=5), by-pass fat (Group II, n=4), by-pass protein (Group III, n=4) and by-pass fat plus by-pass protein (Group IV, n=5). At the end of the dietary treatments at 12th months of age, 40 mg florogeston acetate impreganted sponges were inserted into the vagina for 13 days and on the day of sponge removal each lamb was injected intramuscularly with 400 IU pregnant mare serum gonadotropin. Lambs showing oestrous behaviour were inseminated by rams. Experimental lambs were followed for births during the lambing season. Birth rates were 60, 0, 100 and 66 % for Groups I, II, III, and IV, respectively. In conclusion, it has been observed that implementation of a good nutritional programme and induction of ovulation of ewe-lambs during the first breeding season of their life results in successful pregnancies and births. In addition, by-pass protein based ration appears to be the most suitable for the fulfilment of this purpose.

Keywords:

sheep breeds, lambing rate, lambing, diets, animal nutrition, Tuj, progestogens, nutrition,

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