Some ideas to make the Toro beneficial and introduce a risk-reward for keeping him around, rather than killing him from a distance and removing all added gameplay elements:

• presence of Toro decreases other cows' DTF meter
• alternatively, the Toro could be ready for breeding 30 seconds after the last breeding, but could not breed with another Toro (or he COULD breed with another Toro, but it wouldn't produce a baby, which could introduce a balance so you don't keep too many Toros around)
• Toros will attack hostile mobs that get too close to a cow (could cause issues if they attack creepers, though...)

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