Assuming that the transformer secondary is directly connected to a parallel LC circuit, then the transformer secondary inductance would have to be taken in parallel with the inductance of the load. Since the transformer inductance is much higher than the load, it wouldn't likely have much effect on the circuit. However, the actual inductance of the transformer secondary, in operation, will likely be less than what you would measure under open circuit conditions. The admittance of the circuit on the primary side of the transformer is reflected into the secondary, which would have the effect of reducing the secondary inductance.