Yazar "Say, Erkan" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim
    Öğe
    Effect of combined or separate administration of beta carotene-vitamin E and hCG on fertility in sheep lambs
    (Ankara Üniversitesi, 2022) Özmen, Mehmet Ferit; Say, Erkan; Cirit, Ümüt
    This study was performed to investigate the effect of beta carotene- vitamin E and hCG treatments alone or a combination of both on fertility in estrus synchronized Awassi ewe lambs. A total of 103 Awassi ewe lambs were divided into four groups before the study. Lambs were treated with a progesterone sponge for 12 days, PGF2α two days before sponge removal, 600 IU PMSG on sponge removal day, and 150 IU hCG on the day of mating. The control group (n: 25) did not receive any additional treatment. The Vitamin group (β carotene + vitamin E) (n: 26) was treated twice with vitamin combination. The first treatment was on the 7th day before the sponge insertion and the second treatment was on the day of mating. The hCG group (n: 24) was treated with 150 IU hCG on day 12 after mating. The HCG + vitamin group (n: 28) was treated with both β carotene-vitamin E and hCG. Ewe lambs standing to be mounted were considered in estrus and mated. Pregnancy was determined by ultrasound the 30th day after the mating. There were no significant differences between the control and hCG, vitamin and hCG + vitamin groups concerning estrus, conception, lambing, abortion, twinning, fecundity rate, and litter size (P>0.05). It was concluded that the treatments with β- carotene-vitamin E and hCG or both, in addition to estrus synchronization out of the breeding season in Awassi ewe lambs did not improve the investigated fertility indices.
  • Küçük Resim
    Öğe
    The influence of corpus luteum size on the conception in embryo transfer recipient cows
    (Uluslararası Hayvancılık Araştırma ve Eğitim Merkezi Müdürlüğü, 2021) Say, Erkan; Özmen, Mehmet Ferit; Sağırkaya, Hakan
    The aim of study was to investigate the effect of corpus luteums (CL) size that detected before embryo transfer on conception in recipient Holstein cows. The recipient cows utilized had at least one birth and aged 3-8 years old. PGF2α was injected 2 times space 14 days apart to cows and 87 cows which show estrous symptoms were determined as recipient. Fresh embryos were transferred after estrous in 6th-8th days. Ovaries were examined by ultrasound before transfer and CL sizes were measured. A scale of ‘++++’ were set as a result of measurements. Recipient cows were into 3 groups. The first group was named as CL2+ (n=25) and consisted of cows with ‘++’ (≥15-20< mm) size CL. The second group was named as CL3+ (n=52) and consisted of cows with ‘+++’ (≥20-25< mm) size CL. The third group was named as CL4+ (n=10) and consisted of cows with ‘++++’ (≥25 mm) size CL. The embryos were transferred to the uterine horn on the side of the CL (ipsilateral). Pregnancy rate was respectively 36%, 46.2% and 40% for groups. No statistically significant difference was found between groups in terms of the effect of CL on conception (P>0.05). As a result, it was concluded that the size of the corpus luteum has no effect on the conception of cows utilized as recipients in embryo transfer.
  • [ X ]
    Öğe
    Mevsim dışında östrus senkronizasyonu uygulanmış kilis çebiçlerinde eCG uygulama zamanının fertilite üzerindeki etkileri
    (2021) Çınar, Elif Merve; Özmen, Mehmet Ferit; Say, Erkan; Şireli, Halit Deniz; Cirit, Ümüt
    Bu çalışmada, östrus senkronizasyonu uygulanan genç kilis keçilerinde (çebiç) iki farklı zamanda eCG (500 IU) uygulamasının östrus ve gebelik oranları ile yavru sayıları üzerindeki etkileri araştırılmıştır. Daha önce hiç çiftleşmemiş olan 13-15 aylık 23 çebiçe, üreme sezonu dışında 11 gün süre ile progesteron emdirilmiş süngerler (20 mg flugestone acetate) ve sünger uzaklaştırılmasından 2 gün önce PGF2? (125 mcg cloprostenol) uygulandı. eCG; 1. gruptaki çebiçlere (n:11, -48. saat grubu) sünger uzaklaştırılmasından 2 gün önce uygulanırken, 2. gruptaki çebiçlere (n:12, 0. saat grubu) sünger uzaklaştırma gününde uygulandı. Tekelerin atlamasına izin veren çebiçler östrusta kabul edildi ve çiftleştirildi. Her iki gruptaki tüm çebiçler östrus gösterdi. Birinci (-48. saat) grubun gebelik (oğlaklama) oranı (sırasıyla %54,6 ve %25.0, P>0.05) ve toplam yavru sayısı (sırasıyla 7 ve 3, P>0.05) ikinci (0. saat) gruptan sayısal olarak daha yüksek bulundu, ancak gruplar arasındaki farklılıklar istatistiksel olarak önemsiz bulundu. Çalışmada; gebelik oranı ve toplam yavru sayısındaki sayısal artışın ekonomik değerleri göz önüne alındığında, Kilis çebiçlerinde üreme mevsimi dışında eCG’nin sünger uzaklaştırılma zamanından ziyade, sünger çıkarılmasından 48 saat önce uygulanmasının daha faydalı olabileceği sonucuna varılmıştır.