Effect of GnRH 7 Days Before Presynchronization With Simultaneous PGF and GnRH on Reproductive Outcomes in Holstein Dairy Cows.

We evaluated if an additional GnRH injection 7 days before pre-synchronization with simultaneous PGF and GnRH (PG+G) would improve responses to presynchronization, synchronization, and pregnancy per AI (P/AI). We hypothesized that administering GnRH 7 days before PG+G would increase ovulation and corpus luteum (CL) presence at the PG+G, improve response to OvSynch treatments and P/AI. Holstein cows were blocked by parity and randomly assigned to either a PG+G (Control, = 205); or to GnRH followed 7 days later by PG+G (ExtG, = 201).

Clinical disease associated with epizootic hemorrhagic disease virus in cattle in Illinois.

Objective: To describe the clinical manifestation of epizootic hemorrhagic disease virus (EHDV) in cattle during an outbreak in northwestern Illinois in the fall of 2013.

Design: Outbreak survey.

Sample: 18 EHDV-affected cattle herds.