Compared to LPI, using Pro$ as your primary selection tool will maximize production yields and the other functional traits (Graph 1). On the other hand, using LPI as your primary selection tool will lead to a herd with exceptional conformation, fat and protein deviations without sacrificing Daughter Fertility or Mastitis Resistance. No matter which index you align yourself with, you can be confident that all of the information that feeds the traits in each index is sourced directly from Canadian dairy farms. Table 1 (see table, right) examines two herds of a similar genetic merit. Herd A decides to select sires exclusively for Pro$ while Herd B chooses to select bulls exclusively based on LPI. After three generations of selection for Pro$, you can expect the daughters resulting from selection in Herd A to produce 256 kg (i.e.: 1744-1488) more than resulting daughters in Herd B. However, you can expect 4% more of the cows in Herd B to be scored Good Plus or better than the cows in Herd A. It is important to note that the results seen in the Graph 1 are only achieved when selection occurs exclusively for each of the indexes. If, for instance, an index like LPI is used as a primary selection tool and then a secondary filter, such as >10 for Conformation is applied, the selection response trend will be altered for all traits.

LPI-VS-PROdollar