what are some Vedic verses which glorify the bull?
In AtharvaVeda Kanda 4 -Sukta -11
Anagvaan Sukta. Supreme Brahman ( Ishwara) is symbolically called as bull ,who carries the cart load of this universe.
अङ्गवान दाधार पृथिवीमु द्यामनडवान दाधारोर्वSन्तरिक्षम् ।
दाधार प्रदिश: षडूर्विरङ्गवान विश्वं भुवनमा विवेश ।।1।।
Prithivi (earth) is held by Ishwara ,who is pulling a cart of this
universe and who is in the form of bull. He also holding Swarga Loka
(Heaven), Antariksha (Space) as well as all the six directions like
east etc. In this way this way this Anagvaan (puller of cart) ishwara
is incusive in all the worlds (Universe).
Here Ishwara( Brahman) is said to be a bull who is pulling cart of universe. Here he is compared with bull , who is having power to pull cart of load.