Change mare to colt in 5 steps?

Several ways have been suggested:-

5 steps: mare to

1. more
2. core
3. cord
4. cold
5. colt

5 steps: mare to

1. more
2. move
3. cove
4. cole
5. colt

4 steps: mare to

1. care
2. core
3. cole
4. colt

4 steps: mare to

1. mart
2. malt
3. molt
4. colt

'Alternative' suggestion, two steps! ...

1. sell mare
2. buy colt