Efecto de la eCG en tratamientos super ovulatorios subsecuentes, sobre la fertilidad en la coneja y la viabilidad en los gazapos

Abstract

Nowadays, the use of exogenous hormones is an increasingly preferred alternative by producers of all farm species, where through it they manage to obtain a greater number of benefits, versus using traditional production methods. In this investigation, the effect and use of equine Chorionic Gonadotropin (eCG) in superovulatory treatments was verified, on established parameters: such as fertility, through follicular and oocyte quality, serum E2 levels and receptivity to the male, in addition to measuring the viability of the rabbits resulting from this protocol through the number of pups per birth, mortality rate and daily weight gain. For this investigation, 27 large hybrid breed multiparous rabbits were considered, and 4 fertile male rabbits, which were treated under the same environmental and nutritional standard, the females were randomly distributed, in a random design, with three completely different treatments ( 9 females per treatment) and each treatment was repeated twice. The treatments consisted of: T0 (control 25UI for synchronization), T1 (medium dose 50UI for superovulation) and T2 (high dose 100UI for superovulation) these doses were administered intramuscularly. The use of eCG for superovulatory treatments in rabbits resulted in an increase in receptivity, ovulation rate and follicular growth, however, it was shown to show no differences in weight gain and number of pups per birth.