Researchers from Colorado State University and Brazil analyzed records on 43,511 heifers and young bulls to determine heritability of yearling heifer pregnancy and scrotal circumference, and the genetic correlation between the two traits. The heritability estimates for heifer pregnancy and scrotal circumference averaged 0.69 and 0.57, respectively. Genetic correlation between heifer pregnancy and scrotal circumference, however, was relatively low, averaging 0.20. Based on the results of this study, the researchers concluded that EPDs for heifer pregnancy could help select bulls for the production of fertile daughters, and would be more effective than selecting on scrotal circumference EPDs. The analysis also indicates scrotal circumference could be incorporated in a two-trait analysis for more accurate prediction of heifer fertility.