Estrus and fertility responses in acyclic ewes treated with short, medium or long-term GnRH-PGF2α-GnRH protocols supplemented with intra-vaginal progesterone therapy

HARIOM HARIOM; HARPREET SINGH; RAVI DUTT; L C RANGA

doi:10.56093/ijans.v91i12.119820

Authors

HARIOM HARIOM Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, Haryana 125 004 India
HARPREET SINGH Haryana Pashu Vigyan Kendra, Karnal, Haryana
RAVI DUTT Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, Haryana 125 004 India
L C RANGA Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, Haryana 125 004 India

https://doi.org/10.56093/ijans.v91i12.119820

Keywords:

AVIKESIL-SÂ®, Crossbred ewes, Ovsynch, Progesterone sponge, Seasonal anestrus

Abstract

The present study was conducted with the aim to compare the effectiveness of the short-term (5 days), moderateterm (8 days) and long-term (12 days) progesterone therapy in the form of intravaginal AVIKESIL-S® progesterone sponge developed by CSWRI, Avikanagar (Rajasthan), during modified GnRH-PGF2α-GnRH treatments during non-breeding season (May-July) in crossbred (Nali×Rambuillet) ewes. The seasonal anestrus ewes were enrolled into four groups. In Group 1 (n=50), ewes were treated with GnRH on day 0, PGF2α on day 5, and second GnRH on day 7 plus progesterone supplementation with intravaginal progesterone sponge from day 0 to day 5 while in Group-2 (n=50), ewes were treated with GnRH on day 0, PGF2α on day 8, and second GnRH on day 9 plus
progesterone supplementation with intravaginal progesterone sponge from day 0 to day 8. Further, in Group 3
(n=50), ewes were treated with GnRH on day 0 and PGF2α on day 12 and second GnRH on day 13 plus progesterone
supplementation with intravaginal AVIKESIL-S® sponge from day 0 to day 12. Group 4 (n=50), comprised of
untreated control animals. Results showed that estrus synchronization rate (%) was significantly higher in Group 2
and Group 3 in comparison to Group 4 (control). There was significant difference in the duration of estrus, pregnancy rate, lambing rate in Group 2 as compared to Group 4 (control) but prolificacy and fecundity were not statistically significant (p>0.01) among the groups during out of breeding season. Thus, modified Ovsynch protocol with 8-day progesterone therapy is better for augmenting fertility in crossbred ewes during non-breeding season.

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