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Next week: Proof Day - what is changing in the UK?

The August UK dairy bull proofs will see some big changes to the profitable lifetime index (PLI) as well as the introduction of a new economic index for spring calving herds (SCI).

Having last been updated in 2007, DairyCo and The Genetic Advisory Forum made the decision to reassess the index to take into account the changes in input costs and milk price that have occurred in the past seven years.

Follow the link to the DairyCo website to download a £PLI Factsheet with more information about the new PLI as it will affect the ranking of the bulls in the UK.

Click on this link to download the £SCI Factsheet to learn more about the Spring Calving Index (SCI)

Base Change
Every five years, the national genetic average for every trait is recalculated and reset to zero to account for the genetic progress made. In August 2014 the base is reset. Whenever there is a base change, there will be a noticeable change in PTA values across the board, although the base change itself causes no change in ranking

The genetic base for all breeds is reset to the average genetic merit of cows born in 2010, and the changes compared to the previous base are given in the table below for the different breeds.