Oestrus synchronisation with progesterone-containing sponge and equine chorionic gonadotropin in Pirlak ewes during the non-breeding season: can Toryum improve fertility parameters?

Abstract

IntroductionThe aim of the study was to determine the effect of the vitamins, omega-3 polyunsaturated fatty acid and minerals in the supplement Toryum administered before and during oestrus synchronisation on some fertility parameters of ewes during the non-breeding season.Material and MethodsThe experimental animals were clinically healthy Pirlak ewes, 55–75 days postpartum, aged 2–4 years and weighing 40–50 kg. A sponge was inserted into the vagina for 10 d (G1, n = 30; G2, n = 30) or 14 d (G3, n = 30; G4, n = 30) for oestrus synchronisation, and on the day of removal, 400 IU equine chorionic gonadotropin was injected. Toryum soft capsules were administered individually (1 capsule/ewe p.o.) to G1 and G3 ewes seven days before the sponge was inserted and on the day it was removed. Oestrus detection was started 12 h after sponge removal. Pregnancy was diagnosed by transrectal ultrasonography on the 30th day after mating.ResultsThe pregnancy rate was statistically different between G1 and G4 (P < 0.05). The onset of oestrus was statistically different (P < 0.001) between the 10-d groups (G1 and G2) and the 14-d groups (G3 and G4). The litter size and oestrus, conception, lambing, multiple birth, and survival rates were not significantly different between the groups (P > 0.05).ConclusionToryum administered to Pirlak ewes during progesterone-based oestrus synchronisation protocols during the non-breeding season may increase pregnancy rates. The relationship between Toryum and fertility parameters in ewes would be better understood by comprehensive studies.

Effect of oestrus synchronization with different lengths of progesterone-impregnated sponges and equine chorionic gonadotropin on reproductive efficiency in Romanov ewes during the non-breeding season

“…In addition, eCG treatment increases reproductive efficiency in such protocols (Kuru et al 2018a). In recent years, many studies have reported on the duration of the sponge in the vagina (Texeira et al 2016;Kuru et al 2017Kuru et al , 2018aKuru et al , 2020. Shortening of the sponge treatment length had no negative effect on fertility (Kuru et al 2018a).…”

“…At 24 h after sponge removal, ewes were housed with rams for 4 d at a female:male ratio of 6:1. In a 4-d period, heat detection was made every 8 h. When the ewe mated, it was determined to be in heat and removed from the group (Kuru et al 2020).…”

“…The main purpose of these protocols is to increase reproductive efficiency by administering various hormones (Stevenson and Britt 2017;Kuru et al 2018a). Sheep are seasonally polyoestrous and generally, there is no sexual activity during the non-breeding season; therefore, hormonal manipulation is needed to stimulate oestrus during this period (Abecia et al 2012;Kuru et al 2018aKuru et al , 2020.…”

“…Progesterone and its analogues are used effectively in induction and synchronization of oestrus in ewes (Kuru et al 2018a). The progesterone-impregnated sponge is inserted intravaginally for 10 to 14 d. Oestrus is detected approximately 30 to 37 h after removal of the progesterone-impregnated sponge (Kuru et al 2020). Progesterone treatment should be combined with equine chorionic gonadotropin (eCG) (Abecia et al 2012;Garoussi et al 2020), a hormone with simultaneous follicle-stimulating-hormone-and luteinizinghormone-like activities.…”

Gebe Kısrak Serum Gonadotropini (PMSG)’nin Sütçü İneklerde Senkronizasyon ve Gebelik Oranları Üzerine Etkileri

“…26 Bu becerisi ile koyun ve keçilerde progesteron ile birlikte östrus senkronizasyonu ve ikizliği artırmak amacıyla sıklıkla kullanılmaktadır. [27][28][29] PMSG'nin sığırlarda kullanımı genel olarak ovulasyon oranını arttırmak üzerine denenmiş ve ovulasyon senkronizasyonu üzerine pozitif etkileri tespit edilmiştir. [30][31][32] Bu çalışmaların ortak yaklaşımı, ovulasyonu elde etmek amacıyla gerekli olan LH pikinin sağlanması amacıyla, PMSG'nin de kullanılabileceği üzerinde yoğunlaşmaktadır.…”