en_tn_lite_do_not_use/exo/09/03.md

then Yahweh's hand will bring

The word "hand" here represents Yahweh's power to afflict their animals with disease. Alternate translation: "then the power of Yahweh will bring" (See: rc://en/ta/man/translate/figs-metonymy)

will bring a terrible plague on your livestock ... flocks

"will cause your livestock ... flocks—to die from a terrible plague"

on your cattle

The word "your" here refers to all the people of Egypt who owned cattle.