Breeding Values
Black/Red/Local
Breeding values for bulls are expressed in relation to a base. In The Netherlands and Flanders, three bases for breeding values are defined, Black & White, Red & White and Local. Breeding values can be converted from one basis to another base by adding or subtracting a certain value to a breeding value.
The conversion factors to convert breeding values from one base to another can be found in the Basedifference PDF here.
Calculating breeding values for % fat and % protein per base
The following two formulaes are used:
F%fat = ((Fkgf * 100) – (Fkgm * P%fat)) / (Fkgm + Pkgm)
F%protein = ((Fkgp * 100) – (Fkgm * P%protein)) / (Fkgm + Pkgm)
in which:
P = average production of the animals of that base for the indicated traits.
F = breeding value for the indicated traits.
The factors Pkgm, P%fat and P%protein are indicated per lactation in the following table:
[table width=”600″]
Base/Lactation/Pkgm/P%fat/P%protein
Black & White/1/7304/4,30/3,41
/2/8615/4,31/3,47
/3/9217/4,32/3,44
/overall/8234/4,31/3,44
Red & White/1/6707/4,51/3,50
/2/7871/4,52/3,55
/3/8518/4,53/3,52
/overall/7562/4,52/3,52
Local/1/5280/4,46/3,60
/2/6141/4,46/3,67
/3/6694/4,42/3,63
/overall/5932/4,45/3,63
[/table]