For the source text click/tap here: Beitzah 33
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Rava rules that one may not use a piece of wood from a broken utensil as firewood on Yom Tov since the wood was not prepared for such use before Yom Tov. The Gemara infers from here that Rava must follow the view of Rebbi Yehudah, who prohibits objects like this as Muktzah on Yom Tov.
The Gemara questions this assumption from another statement of Rava. The Gemara relates that on Yom Tov, Rava told his servant to roast a goose and throw the intestines to a cat. The Gemara understands from this statement that Rava follows the view of Rebbi Shimon, who argues with Rebbi Yehudah and permits one to move an object on Yom Tov for the sake of animals, even though the object was designated for human use and not for animals before Yom Tov.
Rashi (DH Kivan d'Mesrechi) writes that the goose intestines were still fit for human consumption on Yom Tov.
We examine the cultural and culinary history of goose gizzard and giblets and the human desire to stuff geese...for the sake of foie gras...