Shukra, Venus, owns Vrishabha, and the house that Vrishabha occupies in a given chart is read through Shukra's condition wherever he happens to sit. This is the ordinary logic of rashi lordship in jyotisha and it applies before any characterisation of the sign is brought in.
Chandra, the Moon, is exalted in Vrishabha, and the texts give the exact degree as the third. This is the highest point of the Moon in the whole zodiac, and it is one of the more heavily used facts in the system, because the Moon carries far more weight in jyotisha than in Western practice: the birth Moon determines the janma nakshatra, sets the starting point of the vimshottari dasha sequence, and is often used as an alternative ascendant for reading the chart a second time. A Moon near three degrees of Vrishabha therefore affects the reading in several places at once. No planet is assigned debilitation in Vrishabha, which makes it one of the signs with an exaltation and no matching fall.
The nakshatras crossing the sign are Krittika in its last three quarters, Rohini entire, and Mrigashira in its first two. Rohini is the mansion in which the Moon is exalted, and the two facts reinforce one another: the exaltation degree of the Moon falls inside Rohini, so the sign, the mansion and the planet all point the same way at that part of the zodiac. That convergence is unusual, and it is why this arc receives so much attention in practice.