Luteotropic effects of human chorionic gonadotropin administered 7.5 days after synchronous estrous induction in Morada Nova ewes

Effect of hCG administration on Day 7 post-mating on accessory corpus luteum development and progesterone concentration in llamas

“…Thus, it is probable that in this group the original CL maintained its morphology but not its function; maybe due to a hemodynamic effect related to the development of the accessory CL (it must be considered that 2/3 non-pregnant llamas showed both original and accessory CL in the same ovary) (data not shown). In sheep, CL diameter and vascularization were greater in hCG treated females compared to the control group, both in pregnant and non-pregnant animals, suggesting a luteotrophic effect on the original CL [34]. On the contrary, no significant differences were found in CL diameter between hCG treated and control cows, although a differentiation between pregnant and non-pregnant animals was not included in the experimental design of this study [15].…”

Luteal function in cyclic goats treated with human chorionic gonadotropin administered by intramuscular or intravaginal routes at the time of artificial insemination

“…Human chorionic gonadotropin (hCG) has been used to improve the reproductive efficiency of small ruminants (da Fonseca et al, 2021). Administered in the presence of functional ovulatory corpora lutea (CL), hCG induces the formation of accessory CL (Côrtes et al, 2021; Fonseca et al, 2018; Rodrigues et al, 2022; Vergani et al, 2020), has a luteotropic effect on original CL, increases circulating progesterone (P 4 ) concentrations (Fonseca et al, 2006; Rodrigues et al, 2022; Vergani et al, 2020) and boosts pregnancy rates in small ruminants (Akif Cam & Kuran, 2004; Côrtes et al, 2021; Gómez‐Brunet et al, 2007; Khan et al, 2009; Rodrigues et al, 2022). Human chorionic gonadotropin can also be used at the time of mating/artificial insemination.…”