Muscovy duck that was poisoned now has wry neck

[newbie ducks]

so a few weeks ago a bunch of muscovy ducks were poisoned & my friend saved this guy life, however his poo was yellow then green & had a little bit of yellow again, but now green again. he showing signs of wry neck this is what she gives him, is there anything else she can do?
she said still no progress with control of his body and neck , though he moves his neck well he has strength in it his ones eye is still closed he is bathing and preening himself , eating and drinking . He is very strong physically and mentally . He is also very smart . I see him cleaning himself and flapping his wings as if he just went swimming in his cage area and very independent when it comes to eating and drinking and as soon as he sees me he stops

 

[newbie ducks]

so a few weeks ago a bunch of muscovy ducks were poisoned & my friend saved this guy life, however his poo was yellow then green & had a little bit of yellow again, but now green again. he showing signs of wry neck this is what she gives him, is there anything else she can do?
she said still no progress with control of his body and neck , though he moves his neck well he has strength in it his ones eye is still closed he is bathing and preening himself , eating and drinking . He is very strong physically and mentally . He is also very smart . I see him cleaning himself and flapping his wings as if he just went swimming in his cage area and very independent when it comes to eating and drinking and as soon as he sees me he stops

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giving him niacin , vitamin E and selenium as well as nutri drench