Resumen de Efecto de la gonadotropina coriónica equina (ecg) en la tasa de fertilidad en vacas de leche cruzadas bajo condiciones de altitud en Ecuador
Joaquín Garnica, C. Sagbay, M.C. Brito, J.L. Masache, P.G. Webster, C. Mínguez
An experiment was carried out to estimate the effect of eCG in fertility rate of crossbred dairy cows (25% Brown Swiss x 75% Holstein) subjected to high altitude conditions in Ecuador. These conditions could produce a syndrome of right-sided heart failure produced by elevated blood pressure in the pulmonary arterial tree and, as consequence, it produces a decrease in productivity and fertility. In the experiment, the data were derived from 100 lactating cows, randomly divided into two groups (50 cows per group). The cows were subjected to a protocol of synchronization for ovulation timed artificial insemination (IATF). One group of them was treated with 400 UI of eCG in the IATF protocol and the other was the control group. The IATF was: Day0 (D0)-a progesterone releasing intravaginal device and 2mg of estradiol benzoate, D7-progesterone releasing intravaginal device removed and 25mg PGF2Į, D8-2mg of estradiol benzoate, D9AM-IATF, D14-400mg eCG (only for group 1), D45-Pregnancy diagnosis by ultrasonography examination. A Chisquare test reported non-significant differences between the two groups (P-value = 0.13). Thus, adding 400 UI of eCG into the IATF protocol was inefficient to improve the fertility rate in crossbred cows subjected to high altitude in crossbred dairy cattle in Ecuador.
