Plasma steroid profiles and ovarian response in llamas treated with eCG for superovulation combined with exogenous progesterone during early luteal phase.

The objective of this study was to evaluate the effects of plasma progesterone (P) concentrations during eCG-ovarian follicular superstimulatory treatment performed in early luteal phase and estradiol concentrations during peri-ovulatory period on ovarian response, number and embryo quality. On Day -2, females (n = 75) having a follicle ≥7 mm were treated with GnRH to induce ovulation. On Day 0, females that had ovulations (n = 54) were treated with 1000 IU eCG and were assigned to one of two treatments: (1) intravaginal device (ID) containing 0.

Effect of GnRH analogue administration on Day 7 after natural mating on formation accessory corpus luteum, progesterone concentration and conception rate in llamas (Lama glama).

The objectives of the present study were to determine the effects of exogenous GnRH administered 7 days after breeding on the formation of an accessory corpus luteum (ACL), plasma progesterone (P) concentrations and pregnancy rates. Adult females (n = 71) having a follicle ≥ 7 mm in diameter in the ovary were naturally mated (Day 0). On Day 7, ultrasonic examination was performed to confirm the occurrence of ovulation as evidenced by presence of an induced corpus luteum (ICL).