Bekhorot 35: Intent, Testimony, and Expertise

3 mishnayot! 1 - Beginning with a story about a Roman soldier intentionally blemishing a first-born ram, and how the sages approved that case as a blemish, but not when others attempted the same. Likewise, kids who tied the tails of lambs together, including first-borns, and one lost a tail, and that case was also permitted, but not as a general rule. Intent would ruin that. 2 - One who kicks a first-born and causes a blemish. 3 - Who can testify about the blemish to a first-born, when it's brought to an expert to adjudicate the blemish?