The present invention relates to compositions or vaccines for combating Mycoplasma hyopneumoniae (M hyo), Porcine Circovirus type 2 (PCV2), and Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) infections in animals and for increasing the ability of pigs to gain weight and/or improve death loss, methods of vaccination against the infections, and kits for use with such methods and compositions.