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Yes. It's why it's a common ingredient in lawn care products. It has no effect on grasses.

Just wanted to add this info to this thread since it may come up on searches and it's a question practically everyone is misinformed about - the safety of 2-4D where chickens are concerned. Pets and people, too. If you can thrash your way through a scientific paper, read this...

Lawns, sod type grasses, don't stand a chance under the busy action of chicken feet due to the shallow root system. The best thing to do is: 1- Spray the weeds with a generic 2-4D broad-leaf herbicide before the weeds produce seeds, if possible. Yes, it's safe to do where chickens will range...