Mishnayos Chullin Perek 6 Mishnah 1

The mitzva of covering the blood after slaughter is in effect both in Eretz Yisrael and outside of Eretz Yisrael, both in the presence, i.e., the time, of the Temple and not in the presence of the Temple. And it is in effect with regard to non-sacred animals, but it is not in effect with regard to sacrificial ones. And it is in effect with regard to the slaughter of an undomesticated animal and a bird, with regard to animals and birds that are readily available in his home, and with regard to those that are not readily available and are hunted in the wild. And it is in effect with regard to a koy, because it is uncertain whether a koy is a domesticated animal and one is exempt from the covering of its blood or whether it is an undomesticated animal and one is obligated to cover it. And one may not slaughter a koy on a Festival, because covering its blood entails the performance of prohibited labor that is permitted only if there is a definite obligation to cover the blood. And if one slaughtered a koy on a Festival after the fact, one does not cover its blood until after the Festival.