Efecto de la progesterona más estradiol sobre la sincronización, ovulación y calidad de embriones en yeguas de la raza árabe

Abstract

An intravaginal device containing progesterone (P4) plus estradiol benzoate (E2) was inserted into 10 Arabian mares to synchronize estrus and ovulation and evaluate the quantity and quality of embryos. A 1g P4 device and 2 mg of estradiol benzoate were inserted on day zero. On day 10, the device was removed, and 150 µg of sodium cloprostenol was administered. It was compared with a control treatment where cloprostenol at the same dose plus human chorionic gonadotropin (HCG) was administered on day 10. Using the device with estradiol and a luteinizing hormone proved effective in inducing ovulation in mares. On day 15, follicular monitoring determined that the size of the preovulatory follicle was >39 mm. The size of the follicle and corpus luteum was observed, with the follicle being more prominent in the primary treatment, with an average ovulatory follicle size of 41.55 mm compared to 40.8 mm in the control. The mean size of the corpus luteum was 30.92 mm in the primary treatment versus 29.7 mm in the control. However, no statistical difference between variables was observed, but there was a 40% correlation between follicle size and corpus luteum diameter. Follicular and corpus luteum irrigation was higher in the P4 treatment at 75%, compared to 38% in the prostaglandin treatment. Higher quality and quantity of structures were observed in the P4 treatment, reflecting a p-value of (p=0.55), indicating a statistical difference between variables by treatment.