In the current study, treatment with eCG increased
rates of ovarian follicular growth and ovulation after
implant removal, treatment with GnRH improved the
synchrony of ovulation, and treatment with either
hormone significantly improved pregnancy rates in
suckled Nelore cows submitted to TAI. Therefore,
hypotheses that eCG treatment increases ovarian
responses and pregnancy rates and that GnRH improved
the synchrony of ovulation and pregnancy rates were
supported. However, it was noteworthy that the effects
of eCG and GnRH were not additive (no significant
interaction)