i've brined store bought and fresh-killed, i'e gone with kosher birds and i've cooked butterballs. with the exception of the fresh killed bird, the cooking technique was more important than the bird itself in the final outcome. the fresh-killed birds smoked or not were just better.
i would still marinate a butterball and sometimes i inject (rasberry vinagrette salad dressing) and sometimes i don't. you can taste the diffrence, but i can't tell you it's better.
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