Abstract
Different schemes of PMSG treatment on some reproductive parameters in sheep were studied. Two groups of 6 sheep each at the end of the non breeding season were treated with vaginal sponges Chrono-gest (Intervet, Holland) containing 30 mg fluorogeston acetate (FGA). The sponges were removed 12 days after insertion. Sheep of the experimental group were injected with 500UI Folligon (Intervet, Holland) 48 hours before sponge removal whilst the corresponding control sheep were treated with the same dose Folligon at the day of of sponge withdrawal. The clinical signs of oestrus, plasma progesterone concentrations and changes in the ovarian morphology during the observation period were registered. The conception rate, fertility and twinning rate were also recorded. The results show that the earlier application of the gonadotropin influence positively the reproductive traits in ewes.
Highlights
Most of the sheep breeds reared in Bulgaria exhibit seasonal reproductive rhythmicity associated with changes in the natural dark-light cycle
The aim of the current study was to evaluate the effect of the various schemes of PMSG treatment on estrous synchronization, fertility and conception rate in sheep treated with progestagen, at the end of anestrus
The experimental sheep were injected with 500 UI Folligon (Intervet, Holland), 48 hour before sponge removal whereas the controls received the same treatment on the day of sponge withdrawal
Summary
Most of the sheep breeds reared in Bulgaria exhibit seasonal reproductive rhythmicity associated with changes in the natural dark-light cycle. Different schemes of estrous synchronization has been studied in order to improve reproductive efficiency (Kusina et al, 2000) adjusting the lambing time to the most favorable time of the year in relation to the forage availability, climatic conditions and market trends (Karaca et al, 2009). According to Jainudeen et al (2000) reproductive photoperiodicity may successfully be modified by progesterone treatment which would be expected to lengthen the luteal phase of the cycle. It was found that gonadotropins stimulate follicular growth, increase the ovulation rate and fertility and improve synchronization (Cline et al, 2001; Maurel et al, 2003; Ralchev et al, 2008). The aim of the current study was to evaluate the effect of the various schemes of PMSG treatment on estrous synchronization, fertility and conception rate in sheep treated with progestagen, at the end of anestrus
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