Pre-Selection test to identify high responder donor goats

The aim of the study was to evaluate the feasibility of pre-selection of high or low responder does prior to the superovulatory protocols. Twenty Saanen does received 800 IU of equine chorionic gonadotropin (eCG) at the end of long-term progestogen treatment. Fourteen days later, a second progestogen protocol associated with a multiple-dose follicle stimulation hormone (FSH) treatment (5 IU/kg of FSH, in six decreasing doses between days 4 to 6 of the protocol) was administered. Transrectal ultrasound was used to assess the follicular status at the beginning of superovulatory treatments, at the oestrous onset and on the seventh day of the oestrous cycle for counting corpora lutea (CL). A significant lower number of CL was obtained in eCG-treated in comparision with FSH-treated does (p 0.05). In conclusion, the screening test with eCG has the potential to identify Saanen does that will better respond to the superovulatory protocol with FSH. In addition, it highlighted the importance of an ultrasound evaluation prior to the beginning of superovulatory treatments with FSH to characterize the follicular status and identify the potential donors of high ovulatory response in MOET programmes in goats.EEA BarilocheFil: Balaro, Mario Felipe Alvarez. Universidade Federal Fluminense. Faculdade de Veterinária. Departamento de Patologia e Clínica Veterinaria; BrasilFil: Brandao, Felipe Zandonadi. Universidade Federal Fluminense. Faculdade de Veterinária. Departamento de Patologia e Clínica Veterinaria; BrasilFil: Maia, A.L.R.S. Universidade Federal Fluminense. Faculdade de Veterinária. Departamento de Patologia e Clínica Veterinaria; BrasilFil: Cueto, Marcela Isabel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; ArgentinaFil: Gibbons, Alejandro Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; ArgentinaFil: Fonseca, Jeferson Ferreira. Embrapa Caprinos e Ovinos. Núcleo Regional Sudeste; Brasi