Does the Kohen burn the body of the bull whole?
Zevachim, 3a: No! We learn via a Gezeirah Shavah 'Rosho u'Kera'av' 'Rosho u'Kera'av' from the Olah that it must be cut-up 1 into pieces. 2
Zevachim (Ibid.): But not skinned (like the Olah) ? since, just as 'Pirsho be'Kirbo' (the dung remains inside it), so too, does the skin remain on the Basar.
Refer to 4:12:1:1.