In general terms, a negative variation of the genetic base highlights an improvement of a certain characteristic.
For example, the Milk base has varied by 125 kg, increasing the population zero value to 10,928.75 kg of milk at 305 days. In order to correctly read the milk data of a certain bull, it will be necessary to add the value of the population base (10,928.75 kg) to half of the bull’s data: to keep it simple, in Pegasus’ case, half of his data (+1751 kg) should be added to the population average of 10,928.75 kg. That means Pegasus’ daughters have a prediction at 305 days of 11,804.25 kg of milk.
The productive data of fat and protein are read in the same way.
Looking at the general trend, there is an increase in milk production in the Italian Holstein population. The selection has also reach excellent results in terms of functional traits: somatic cells have descresed from 2.82 to 2.79 (linear score), with a variation of -0.48 on the SCS index. Longevity (-0.72) and ferility (-0.22) have also improved.
Instead, like the last year, the BCS is experiencing a continuous worsening, due to the fact that it is not yet considered in the selection programs, even though Intermizoo has been working on it for some years.