Statistics addicts can feast their eyes on these tables: they present the actual production figures of the most important and most popular bulls. A lower limit of at least 75 milk records per lactation applies.
Transmission of +750 for kilos of milk, –0.10% for fat and +45 for kilos of protein. CRV publishes new breeding values for bulls three times a year. These breeding values are based on hard figures. Delta Potter P, for instance, owes his high breeding value for protein to the performance of his offspring. And L W Crescendo’s daughters ensure their sire is known for the generous quantities of milk he passes on.
These raw, uncorrected production figures form the basis of the estimated breeding values. The rule for all bulls is that daughter productions are only published if at least 75 milk records are available per lactation. Generally speaking, the more daughters a bull has, the closer the actual production figures correspond to the breeding values. Take Bouw Rocky and Apina Malcolm, for example. The duo shows a clearly different inheritance pattern for kilograms of milk. On paper Malcolm passes on around 1100 kilos more than Rocky. Half of that, about 550 kg, should be apparent in the milk production of his daughters. The practice confirms this quite well: as heifers, Rocky daughters produce 8011 kg and Malcolm’s daughters nearly 8500 kg.
|Name bull||Birth year||Breed. val. kg milk||305 day prod. as heifer (kg m.)|
|Apina Malcolm rf||2012||+1291||8499|
Table 1 – Comparison of breeding value for milk production and actual daughter productions for a number of bulls
However the raw, uncorrected production figures and breeding values do not always dovetail so neatly. Sometimes, for example, a particular bull has been mainly used on high-productive cows and/or farms. Variations in the age at calving, or the year of calving, can also lead to differences between raw production figures and breeding values. To avoid creating a distorted picture, this effect is factored into the estimated breeding value.
Differences between breeding values and actual production figures
Sometimes daughters of bulls with almost equal breeding values for milk production can still have a very different production average. The bull’s year of birth and the period when the daughters started lactating can also play a role in the imbalance between breeding values and actual production figures. Kodak and Maiko – with an age difference of nine years – have a virtually identical breeding value for kilos of milk. Despite this, production of Maiko’s daughters in their first milk record is more than 400 kg higher than Kodak’s daughters. This could be linked to the different year of birth. When Kodak’s daughters started lactating, the national production figure was lower than now.
Milk, fat and protein in 305 days
|List. No. (Lactation)||Number of lactations||kg milk||%fat||% protein||kg fat||kg protein|
|Double W Ranger|
|Batenburg G. Stellando rf|
|Horst Allard rf|
|Kingfarm Holsteins Anreli|
|Delta Potter P|
Table 2: Uncorrected 305-day milk records of daughters of the most popular bulls in the Netherlands, ranked by category per number of first inseminations in the 2019-2020 financial year.