Effect of early administration of progesterone on the function of the corpus luteum of llamas

ROSSETTO L; GALLELLI, M. FLORENCIA; FRANCO G.F; ABA, MARCELO; MIRAGAYA, MARCELO H.; BIANCHI, CAROLINA

ANIMAL REPRODUCTION SCIENCE

ELSEVIER SCIENCE BV

Año: 2023

0378-4320

The aim of the present study was to evaluate if early administration of progesterone immediately after ovulation affects corpus luteum lifespan in llamas. Female llamas (n=16) were induced to ovulate by Buserelin injection in the presence of an ovulatory follicle (Day 0). On Day 2, ovulation was confirmed and animals were randomly divided into two groups: treated animals (n=8) received an intravaginal device containing 0.3 g of progesterone from Day 2 to Day 6 post-induction of ovulation and control group (n=8) received a device with 0 g of progesterone. Blood samples were collected daily to determine plasma progesterone concentration and transrectal ultrasonographies were performed from Day 7 to Day 12 post-induction of ovulation.