Bull, Bullock (see Cattle).

Bulls like all cows are a big bulky animal that can cause you damage if they get too close to you. But bulls are the male of the species, and they are especially aggressive. The idea of a bull is one of power, energy and strength.

Bulls were preferred in the temple sacrifices because they were more of a symbol of this strength and power. For a farmer, they were good cattle for them. Lots of meat, good for when they are slaughtered and sold. But this good value was sacrificed to the Lord.

Source: [Anon-Animals]