Reproductive Performance and Progesterone Concentration Changes on Mamasani Goats, using Human Chorionic Gonadotropin during 1.5, 2 and 7 Days after Mating on the Spring Season

Subject Areas :

M. Ghaedi ¹ , J. Habibizad ² , M. Meamar ³ , M. Muhaghegh-Dolatabady ⁴

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Received: 2025-01-07 Accepted : 2025-05-30 Published : 2025-09-01

Keywords: eCG, hCG, Mamasani goats, prolificacy rate, reproductive performance, twining rate,

Abstract :

Present study was conducted to investigate the effect of different times of using human Chorionic Gonad-otropin (hCG) during different days after mating on the reproductive performance and serum progesterone concentration of superovulated Mamasani goats. In this study, 60 goats (3-4 years) with the weight range of 46 ± 2.1 kg were used. The goats were synchronized for a period of 15 days and one day before sponge removal, 400 international units of equine chorionic gonadotropin (eCG) were injected to them. The goats were divided into 4 treatment groups based on not receiving (control) or receiving (350 international units of hCG) on one and a half, two, and 7 days after mating. Blood samples were collected on day 2 before sponging and days 19 and 40 after mating. The results showed that fecundity and prolificacy rate were sig-nificantly (P<0.0001) higher in the groups receiving hCG during days 1.5 and 2 after mating compared to the other groups. Serum progesterone concentration of pregnant, delivered, single birth and multiple births goats on 19 and 40 days after mating were significantly higher in the groups receiving hCG compared to the control group (P<0.05). Serum progesterone concentration of multiple births goats in all groups receiving hCG significantly (P<0.05) increased compared to control group in 19 and 40 days of sampling. The results generally showed that reproductive performance and serum progesterone concentration were affected by different times of using hCG and these parameters increased in goats receiving hCG in days 1.5 and 2 after mating.

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