| Study site | Global Positioning System Location | No. of horses (%) |
| Hobonil | 20˚00'54"N, 89˚01'15"W | 22 (22%) |
| Mérida | 20˚58'04"N, 89˚37'18"W | 39 (39%) |
| Tizimín | 21˚08'32"N, 88˚09'03"W | 24 (24%) |
| Umán | 20˚49'38"N, 89˚41'08"W | 15 (15%) |
Total |
|
| 100 (100%) |