Midrash for Bekhorot 67:1
אלא שלא יתן בו מום
only that he must not cause a blemish directly; whence is it learnt that he must not bring a case of pressed figs or dough and put it on the ear so that a dog may come and eat it, [with the possibility of a blemish being caused]?
Sifrei Devarim
(Devarim 14:3) "You shall not eat any abomination": R. Eliezer says: Whence is it derived that if one slit the ear of a bechor (a first-born beast, thus blemishing it) and ate of it (the beast, after slaughtering it), he transgresses a negative commandment? From "You shall not eat any abomination."
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