What are "Tzoneh va'Alafim"?
Rashi: They are Tzon and cattle. Alafim is like "Shegar Alafecha" (Devarim 7:13). Tzoneh is like "u'Gederos l'Tzona'achem 1 " (Bamidbar 32:24). Radak - these are mentioned [after "Kol Shatah Sachas Raglav" - verse 7] because they grow with man and are available to work for him, and for his food and clothing (e.g. wool). Tzon is sheep and goats.
Radak: The Aleph in 'Tzon' is omitted in Tzoneh, and the Hei is converted to an Aleph in Tzona'achem. Gur Aryeh (Bamidbar 32:24) - "Tzoneh" refers to abundance of flock.
Why does it say "Kulam"?
Radak: This includes other animals that grow with man - horses, donkeys and camels.
Malbim: Man uses all of Tzon and cattle, constantly. Refer to 8:8:3:2.
Why does it say "v'Gam Behemos Sadai"?
Radak: Behemos Sadai are Chayos of the field. It says v'Gam, for they do not grow with him in settled areas. He rules over them with his intellect and strategies (e.g. to trap them).
Malbim (7-8): What is closer to man, he benefits more from it. Animals were created on day six; they are warm-blooded and give birth, like man. He uses them more than birds and fish, which were created on day five. Behemos are closer to man than Chayos, and he uses them more. He also makes use of wild animals (Chayos), but not as much as Behemos; they are at a lower level.
