What is the Pasuk referring to?
Rashi: All four items mentioned in the Pasuk 1 apply both to the Gid and to the Beitzim (testicles).
Targum Yonasan: "Ma'uch" and "Kasus" refer to the Beitzim, and "Natuk" and "Karus" to the Gid.
What is the difference between "Ma'uch", "Kasus", "Natuk" and "Karus"?
Rashi: "Ma'such" means 'squashed by hand', 'crushed', 'severed' by hand, but still intact, and 'fragmented', 1 using an implement, respectively.
Aand "Kasus", "Natuk" and "Karus"
And what does the ramifications of "u've'Artz'chem Lo Sa'asu"?
Rashi: It is a prohibition against castrating any animal. 1
Seforno: After dealing with the blemishes that occur randomly, which are confined to Kodshei Mizbe'ach, the Torah discusses commercial blemishes that one does for profit, which the Torah prohibits from performing even by Chulin.
Seeing as the current prohibition has nothing to do with Eretz Yisrael (in which case it applies equally Chutz la'Aretz too), why does the Pasuk insert the word "u've'Artz'chem"?