Commentary for Avodah Zarah 68:14
איבעית אימא סברא גבי עגלי עבודת כוכבים ניחא ליה בנפחיה אבל גבי שור הנסקל לא ניחא ליה בנפחיה
You can say that this can be proved by logic — in the case of calves to be offered to idols it pleases [the owner] that they be fattened, whereas in the case of the ox to be stoned he is not pleased that it be fattened.
Daf Shevui to Avodah Zarah
The Talmud first attempts to explain this with logic. When it comes to the animals offered as idols, the owner would want them fatter—more food for the gods. Therefore, there dung is something he wanted and it has value. But when it comes to an ox sentenced to be stoned, the owner certainly does not care that they be fattened. Therefore, this dung is unwanted and has no value.
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