Cows (n= 120) received a non-degradable implant containing 5 mg of the GnRH agonist Deslorelin (DESL; Peptech Animal Health, North Ride, Australia).
Implants were placed subcutaneously in the outer surface of the right ear using an implanter device after intensive cleaning of the area with alcohol gauze and avoiding blood vessels.
Control (CON) cows (n= 128) did not receive a DESL implant.