Pigeon damage: replant cabbages?

This morning my garden got visited by pigeons. Result: almost all of my cabbage plants are severely damaged. They are covered up now by glass jars, but I'm not sure if the plants will recover. Should I immediately plant new ones instead so as not to lose any time, or should I wait and see if they will pull through?

How big were/are the plants?  If they are only a few days to a couple of weeks old it might be better to start again, but if they are older and so long as the growing tip was not pecked I would keep them if the growing tip is damaged then out with them no matter the age. Do be careful of the temperature under the glass it can easily get hot enough to cook the plants in the sun.