Ugaritic

šḫp - colostrum (DUL 813)

Would be acceptable as a cognate for Proto-MSA *ŝVḫāp- ‘milk’, but the hypothetical attestations of this lexeme in KTU 1.10 iii 25‒26 are highly doubtful. Its interpetation depends on Syr. šḥāpā ‘first milk after calving’ which is also very sparsely attested.