Compared in a bull a bullock is docile because of

Options

A. Lower levels of adrenalin/noradrenalin in its blood
B. Higher levels of thyroxin
C. Higher levels of cortisone
D. lower levels of blood testosterone

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks why a bullock (a castrated male bovine) is more docile compared to a bull (an intact male bovine).

2. **Identifying Key Terms**: The key term here is "docile," which means calm and easy to control. The docility of the bullock is likely related to hormonal differences between the two animals.

3. **Analyzing the Options**:
- **Option A**: Lower levels of adrenaline or noradrenaline in its blood. While these hormones can affect behavior, they are not the primary reason for the docility of a bullock.
- **Option B**: Higher levels of thyroxine. Thyroxine is related to metabolism and energy levels, not directly to aggression or docility.
- **Option C**: Higher levels of cortisone. Cortisone is a stress hormone; higher levels would likely increase stress rather than decrease aggressiveness.
- **Option D**: Lower levels of blood testosterone. Testosterone is known to influence aggression and sexual behavior in males.

4. **Conclusion**: Since bullocks are castrated, they have lower levels of testosterone compared to bulls. This reduction in testosterone leads to decreased sexual drive and aggression, making bullocks more docile.

5. **Final Answer**: Therefore, the correct answer is **Option D: lower levels of blood testosterone**.

---