An investigation to determine the source of the outbreak is underway, as health officials say the birds will be "humanely culled."
"It was terrible to see," said swan rescuer Caroline Sim.
China is currently the epicenter of an outbreak of the new 2019-nCov virus.
The 73,500 birds will be culled to prevent the virus from hitting the food system.
Wild birds that spread the virus will very likely carry it when they begin migrating south in the fall.
Birds were dying in greater than normal numbers at the breeding farm.
Report details numerous accidents at labs handling potentially dangerous viruses