When training my 2 ES around birds I made sure they were able to burn off some energy in the front yard first so they weren't as prone to over excitement in the chicken yard.
Also, when young my 2 were trained for some basic commands. ..."STOP" was a priority, done on leash in yard, near road, and anywhere else at random. They learned me yelling that word meant to halt immediately and wait for next command. Initially done on leash, then while loose but close, eventually from a distance.
..."DROP IT"... self explanatory, but good to train so if they are mouthing something dangerous to them you can hopefully intervene.
...."LEAVE IT"... this one frustrates Dillon to no end, lol... but they have been taught no matter how tempting they are expected to ignore some items if the human says so.
..."NEVER YOU MIND THAT"... I know, odd phrasing, but just a saying I used to tell them that what was going on off property wasn't something they needed to worry about or bark about. Basically the phrase tells them their services aren't needed for that issue. They now recognize it as basically letting them 'off duty' for whatever they thought they needed to worry about. Now once said they seem to be fine to relax and walk away. I guess they trust my judgement, lol.
My dogs are also taught from day one that food can be taken away by a human at any time. Doing this and always praising and rewarding their patience and lack of reaction has resulted in them not being food aggressive and they will now even allow cats and chickens to share their bowl. I stressed this especially with Dillon who isn't as patient with the birds (Mindy adores the birds and is the least food driven dog I've ever known). Dillon can now lay in the yard and ignore birds eating all around him and even under him and he may nudge a bird away from his dish but if a bird persists he backs up, sits and gives me a pitiful look....
I know everyone has different priorities in their training, I have just found these manners to be very helpful when having dogs around chickens. And I have found ES to be VERY smart with training and excellent at recognizing many, many simple command words and phrases.