16-Title: Reproductive response and progesterone profile of aged Corriedale ewes following different hormone based oestrous synchronization schemes

Authors: F Rasool, FA Lone and MN Banday

Source: Ruminant Science (2020)-9(1):77-82.


How to cite this manuscript: Rasool F, Lone FA and Banday MN (2020). Reproductive response and progesterone profile of aged Corriedale ewes following different hormone based oestrous synchronization schemes. Ruminant Science 9(1):77-82.


The aim of this study was to determine the impact of various oestrous synchronization schemes on the reproductive response and progesterone (P4) profile of aged Corriedale ewes. Twenty four (n=24) healthy aged Corriedale ewes (8-9 years) were selected randomly and equally divided into three groups designated as SP, SPG and SE. Ewes in group SP and SPG received intravaginal P4 sponges for a period of 9 days followed by an intramuscular injection of PGF2alpha (250 µg Cloprostenol sodium; Pragma-Intas India) at 24 hours before sponge. However, the SPG group did also receive an intramuscular injection of GnRH (8.2 µg Buserelin acetate; Receptal Vet-MSD India)) on day 12 post breeding. Ewes in group SE also received intravaginal P4 sponges for a period of 9 days followed by an intramuscular injection of eCG (500IU; Folligon, Intervet India) at the time of sponge removal. The pregnancy rate (PR) and lambing rate (LR) were significantly (P<0.05) higher in the SP group as compared to SPG and SE. Time of blood collection affected P4 concentration which was significantly (P<0.05) higher at day 35 in the SP group than SE but non-significantly (P>0.05) higher than the SPG group. Pooled P4 concentration was significantly (P<0.05) higher in pregnant compared with non-pregnant ewes at day 15 and 35. Further, significant (P<0.05) decline in serum P4 concentration was observed from day 0 to 35 in non-pregnant ewes, from day 0 to breeding in pregnant ewes followed by significant (P<0.05) increase from breeding to day 15 and 35. The scheme of oestrous synchronization used in the SP group showed better fertility in older ewes, hence could be used as a valuable tool for better reproductive outcome in aged ewes.


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