Syncrostim 500 IU lyophilisate and solvent for solution for injection for cattle and sheep Dosage and administration Cattle and sheep: Intramuscular use. 500 IU of Equine serum gonadotrophin (eCG) per animal in one administration corresponding to 2 ml of the reconstituted solution. Dissolve the lyophilisate with 2 ml of solvent. Mix until completely dissolved to obtain a homogenous solution. The reconstituted solution should be used immediately. The product should be administered at the time of the progestagen device withdrawal.