Abstract

CAMPERO-CRUZ, Angel et al. Importance of the corpus luteum at the beginning of the protocols to syncronize estrus in sheep. Ecosistemas y recur. agropecuarios [online]. 2023, vol.10, n.3, e3312.  Epub Apr 26, 2024. ISSN 2007-901X.  https://doi.org/10.19136/era.a10n3.3312.

The aim was to examine the exogenous supply of progesterone, and the influence of the corpus luteum (CL) at the beginning of the estrus synchronization protocols in sheep, for 6 and 11 days, on reproductive variables. The sheep were presynchronized to obtain a premature or functional CL at the beginning of the synchronization period to be evaluated. Estrus presentation was lower in short treatments; This triggered a difference (p < 0.05) in pregnancy rate between short and conventional treatments. On the day of estrus, steroid concentration was different: progesterone was higher in short treatments; while estradiol was lower in the short treatment with CL. The presence of a premature or functional CL at the initiation of the treatments commonly used to synchronize estrus does not modify the expression of the reproductive variables; Nevertheless, in short treatments the expression is affected. It is important to use ultrasonography to corroborate what happened at the ovarian level.

Keywords : Estradiol; follicular wave; progesterone; prostaglandin; reproduction.