| Number of Mares Reported Bred to Thoroughbred Stallions in 2021 | |||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | |||||
| Stallion | Mares Bred | State | |||
| K B's Krome | 1 | NM | |||
| K G Cowboy | 6 | MI | |||
| Kafwain | 2 | CA | |||
| Kantharos | 80 | KY | |||
| Karakontie (JPN) | 76 | KY | |||
| Karate | 6 | OK | |||
| Katz My Song | 12 | FL | |||
| Keen Ice | 48 | KY | |||
| Keep Up | 10 | TX | |||
| Kentucky Bear | 6 | MB | |||
| Kentucky Wildcat | 14 | NM | |||
| Kera's Kitten | 4 | PR | |||
| Khozan | 116 | FL | |||
| Kick On | 3 | OK | |||
| Killargue | 3 | FL | |||
| Killybegs Captain | 13 | NY | |||
| King for a Day | 73 | NY | |||
| King of Jazz (ARG) | 14 | CA | |||
| King of the Roxy | 1 | OH | |||
| King Puma | 3 | NJ | |||
| King Zachary | 14 | TX | |||
| King's Empire | 2 | IL | |||
| Kirkendahl | 1 | IA | |||
| Kiss the Ghost | 6 | OH | |||
| Kitten's Joy | 107 | KY | |||
| Klimt | 98 | KY | |||
| Kobe's Back | 25 | MD | |||
| Kumiva | 5 | KS | |||
| Kwontro | 1 | OK | |||