Explanation of terms

Relative breeding values
On the recommendation of the German Holstein Association (DHV), all sires are ranked according to a Total Merit Index (RZG). The RZG includes milk production and the functional traits according to their relative economic importance in the breeding goal. The Total Merit Index RZG as well as its single traits (composites) RZM, RZE, RZS, RZN, RZR and RZKm, are standardized to a mean of 100 and a standard deviation of 12 points.

Since August 2009, there has been the independent breeding value RZFit in Germany. To allow for the high will to milk of Holsteins, a breeding value was developed combining different fitness traits as well as conformation traits and milk production. It serves as a selection tool to easily find bulls with transmission strengths in the field of fitness traits.

In 2014, the breeding values were completed by the RZRobot. Like the RZFit, it is an independent breeding value to make it easier to select the bulls suitable for farms with automatic milking systems.

RZG relative breeding value total merit index

Complex milk production (RZM)

45%

Complex longevity (RZN)

20%

Complex conformation

15%

Complex fertility (RZR)

10%

Complex udder health (RZS)

7%

Complex calving traits (RZKm)

3%

RZM relative breeding value milk production

Protein-kg

75%

Fat-kg

20%

Protein-%

5%


RZM serves as a selection index and is defined as the combined breeding value for milk production traits.

RZN relative breeding value longevity
This breeding value is calculated with the functional longevity and 5 calculation input features. Bulls are only included that have daughters in second lactation on at least 10 farms.

RZR relative breeding value reproduction

Relative breeding value conception rate (KON)

75%

Calving to first insemination

25%


The relative breeding value for reproduction emerges from the relative breeding value conception rate and calving to first insemination. Conception rate is the time period from calving to first insemination. The relative breeding value conception rate comprises the following four traits:
NRR (NRr/NRk): Non-return-rate is published separately for heifers (r) and cows (k). It gives evidence about conception rates. It is noted here whether another insemination takes place during the 56 days after first insemination.
VZ (VZr/VZk): It describes the number of days from the first until a successful insemination. This value is also published separately for heifers (r) and cows (k).

RZS relative breeding value somatic cell count
Cell count results from milk recording are used as a trait for the breeding value estimation of the somatic cell count. Values above RZS 100 are positive with regard to breeding, i.e. imply a lower cell score.

RZE relative breeding value conformation

Dairy type

10%

Body

20%

Feet and legs

30%

Udder

40%


The partial breeding values for dairy type, body, feet & legs and udder consist of the individual indices as well as the complexes from the linear description and are summarized for RZE.

RZD relative breeding value milking speed

Recorded milking speed (kg/min)

50%

Owner’s opinion (fast/normal/difficult)

50%


The recorded milking speed and the owner’s opinion about the temperament are summarized in the RZD.

RZKm relative breeding value calving traits of the daughters (maternal calving ease)

Calving ease of the daughters

50%

Still birth rate of the daughters

50%

RZKd relative breeding value calving ease (direct
calving ease)

Calving ease of the bull’s calves

50%

Still birth rate of the bull’s calves

50%


The characteristic of RZkd is that information on calving ease mainly refers to first calving.

RZFit relative breeding value fitness

Complex fertility (RZR)

20%

Calving traits maternal (RZKm)

20%

Complex longevity (RZN)

15%

Feet and legs

15%

Udder

10%

Complex udder health (RZS)

10%

Complex milk production (RZM)

10%

Relative breeding value RZRobot

Milking speed (RZD) (has to be ≥ 94)

20%

Somatic cell count (RZS)

15%

Feet and legs

15%

Rear teat placement (has to be ≤ 106)

20%

Teat length (has to be ≥ 94)

20%

Udder

10%


The RZRobot is only published if ≥ 100.

Abbreviations

aAa

Triple-A Code by Weeks® Animal Analysis

Triple-A Code by Weeks® Animal Analysis

Betr.

Anzahl Betriebe

No. of herds

BLC

BLAD-Träger

BLAD carrier

BLF

BLAD-frei

BLAD free

BYC

Brachyspina-Träger

Brachyspina carrier

BYF

Brachyspina-frei

Brachyspina free

CVC

CVM-Träger

CVM carrier

CVF

CVM-frei

CVM free

DN

Doppelnutzung Milch und Fleisch

Dual purpose (DP)

ET

aus Embroytransfer

From embryo transfer

EX

exzellent

Excellent

geb.

Geburtsdatum

Date of birth

GP

good plus

Good plus

HB-Nr.

Herdbuchnummer

Herd book number

La

Laktation

Lactation

P

phänotypisch hornlos

Phenotypically polled

PP

homozygot hornlos

Homozygous polled

Pp

heterozygot hornlos

Heterozygous polled

PP*

homozygot hornlos getestet

Tested homozygous polled

Pp*

heterozygot hornlos getestet

Tested heterozygous polled

PS

Wackelhörner

Scurs

RDC

Rotfaktor

Red carrier / Red factor

Si. %

Sicherheit der Zuchtwerte in %

Reliability of breeding value in %

Tö.

Anzahl Töchter

No. of daughters

VG

very good

Very good

VRC

VRC-Träger

VRC carrier

RZF relative breeding value beef

Maternal breeding value

40%

Breeding value for daily weight gain until the age of 365 days

40%

Breeding value for muscularity at the age of 365 days

20%

Abbreviations for beef breeds

B

Bemuskelung

Muscularity

EL

Eigenleistung

Performance test

geb.

Geburtsdatum

Date of birth

GGE

Geburtsgewicht

Birth weight

GV

Geburtsverlauf

Calving ease

HB-Nr.

Herdbuchnummer

Herd book number

Index

Körindex

Index of breed license

KZW

Körzuchtwert

Breed license value

P

phänotypisch hornlos

Phenotypically polled

PP

homozygot hornlos

Homozygous polled

Pp

heterozygot hornlos

Heterozygous polled

PP*

homozygot hornlos getestet

Tested homozygous polled

Pp*

heterozygot hornlos getestet

Tested heterozygous polled

PS

Wackelhörner

Scurs

RZF

Relativ-Zuchtwert Fleisch

Relative breeding value beef

RZFK

Relativ-Zuchtwert Fleisch (Kreuzung)

Relative breeding value beef (cross breeding)

S

Skelett

Skeleton

Si. %

Sicherheit der Zuchtwerte in %

Reliability of breeding value in %

T

Typ

Type

TZ

Tägliche Zunahme

Daily weight gain

Sire catalogue 2017/2018

GGI − German Genetics International GmbH is the international export marketing body of the seven leading German breeding organizations, representing these on the international market. As well as a wide range of sires of beef, dual purpose and other dairy breeds, we offer, in particular, high-class Holstein and Red Holstein genetics. In co-operation with our competent partners worldwide, GGI offers breeders from all over the world access to the entire potential of German Holstein breeding. Moreover, GGI is a reliable partner for all aspects of cattle breeding and management. All sires offered are tested with high reliability and accuracy, based on the worldwide leading estimation model for breeding values. This applies to daughter proven sires as well as to only genomic tested young bulls.

The German breeding philosophy is clearly reflected in GGI’s product range. This includes high milk production with good components, good conformation with excellent feet & legs and functional, healthy udders as well as high fertility and great longevity. The aim is an efficient, healthy, trouble-free cow that gives high production under a variety of housing conditions over many lactations.

Please contact GGI or our international partners because using the best GGI sires you will always be on the right track!

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