Spanish scale

Sire search on the Spanish scale

More Genomic Breeding Values on the Spanish scale

What is ICO and gICO?

The ICO for “Production and Functionality” is the total merit index that is used in Spain for ranking bulls according to the Spanish breeding goal. As soon as genomic information is available, gICO can be computed.

What are the benefits of using gICO?

gICO is a breeding goal that aims for the most profitable animals in the future economic circumstances. Spain is producing annually 6 Million of tons of milk and consumes 9 Million of tons of Milk. Therefor gICO is first focused on production and type. Nevertheless, the definition of gICO has been changed in June 2015 to give more and more importance to the functional traits (fertility, longevity, udder health).

How to understand gICO?

  • Official national breeding values for bulls on the Spanish scale have an average of 1614 and a standard deviation of 1000.
  • 99% of all bulls with official national proof at CONAFE have breeding values below +3178.
  • This means that bulls with a proof higher or equal to +3178 represent the top 1% of all bulls with official national breeding values.
  • Mean and  percentiles are shown at the following link:

Who is responsible for estimation and publication of breeding values?

CONAFE is responsible for the computation of genomic breeding values, 10 times a year, for traits included into gICO as well as calving and workability traits. CONAFE is also responsible for the offical publication of national and international breeding values.

Where do you search for the gICO of a specific sire?

gICO and all other breeding values calculated by CONAFE can be found on CONAFE Bull Search (official website).

Where do you find more information on Spanish proof?



gICO: 5 groups of traits

The gGICO is composed of breeding values for 5 groups of traits with their respective weights:



Press publication

Press publication of the CONAFE and Interbull breeding values takes place 3 times a year on the following dates:

  • Tuesday 23th of January 2018

  • Tuesday 13th of March 2018

  • Tuesday 27th of March 2018

  • Tuesday 3rd of April 2018 (Rankings update*)

  • Tuesday 24th of April 2018

  • Tuesday 22nd of May 2018

  • Tuesday 3rd of July 2018

  • Tuesday 31st of July 2018

  • Tuesday 7th of August 2018 (Rankings update*)

  • Tuesday 4th of September 2018

  • Tuesday 2nd of October 2018

  • Tuesday 13th of November 2018

  • Tuesday 27th of November 2018

  • Tuesday 4th of December 2018 (Rankings update*)

  • Tuesday 18th of December 2018

* including National Bulls, EuroGenomics, MACE, GMACE and Fee System Bulls