IPA: //ˈblʌdstɒk//
KK: /ˈblʌdˌstɑk/
The lineage or breeding of thoroughbred horses or other animals, especially those used for racing or competition.
The bloodstock at the auction included some of the finest thoroughbred horses in the country.
Bloodstock is formed from "blood" (from Old English "blōd", meaning the red liquid that circulates in the bodies of humans and animals) and "stock" (from Old English "stoc", meaning a group or lineage). The term refers to the breeding stock of horses or livestock, emphasizing the lineage or bloodline of the animals.
Think of 'blood' as the vital essence of life and 'stock' as a group or lineage — together, they remind you that bloodstock refers to the breeding lineage of animals.
No commonly confused words.