Table 4 compares the new TPI for the sires with the most sons in active AI to their old TPI values. Some sires have increased their TPI values, while at the same time there is a notable decrease in others. Part of the change reflects changing the numbers used as constant values in the formula. The change in ranks is the result of the extra weight given to fat in the index as well as the addition of Productive Life and SCS to the index. It is important for producers to focus on is the change in ranking rather than the actual decrease in TPI points.
Rankings give a good indication of how bulls compare relative to one another.
We can see in table 4 that there is some re-ranking among sires. Bellwood, despite dropping 73 points, is still the number one ranked sire. This is an example of why rankings are more important than the actual increase or decrease. We can see that Mascot and Luke suffered a considerable drop in rankings, again due to their unfavorable PTAs for fat. Re-ranking for other sires is less obvious, but Converse and Blackstar moved up three and four places respectively.