DIÂMETRO FOLICULAR E FERTILIDADE DE VACAS MESTIÇAS LEITEIRAS SUBMETIDAS A PROTOCOLO DE IATF COM AJUSTES NO PROESTRO.

The objective of this study was to compare synchronization protocols with one and two applications of a luteolytic, simultaneous or not, to equine chorionic gonadotrophin (eCG) on the diameter of the ovulatory follicle (DFOL) and the conception rate of cyclic dairy crossbred females. For this, on D0 the protocol was initiated by means of insertion of progesterone device (P4) and application of 2.0mg of estradiol benzoate. In D7 they received 12.5mg of dinoprost tromethamine. In D9 performed removal of P4 and applied 0.6mg of estradiol cypionate. At this time, females were subdivided into the following treatments: Control Group - 2.5mL of saline solution, Group 2PGF - 12.5mg of dinoprost tromethamine, eCG, Group eCG - 300UI eCG, Group 2PGF + eCG - 300UI eCG and 12.5mg of dinoprost tromethamine. In D11 transrectal ultrasonography (US) was performed to determine the DFOL and the animals were inseminated. The diagnosis of gestation was performed for 55 days after. The obtained data were evaluated by the SPSS considering P=0.05. The DFOL and conception rate were similar between synchronization protocols. It was concluded that in cyclic animals the use of protocol with a single PGF2a dose and without gonadotropic support of eCG seems to provide adequate follicular response and satisfactory fertility indexes. [ABSTRACT FROM AUTHOR]