Explanation of terms

Relative breeding values
On the recommendation of the German Livestock Association (BRS), former 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.

In 2014, the breeding values were completed by the RZRobot. It is an independent breeding value and is not included in the calculation of the total merit index (RZG). The RZRobot makes it easier to select the bulls suitable for farms with automatic milking systems.

The RZhealth will be introduced in April 2019 which is a health breeding value that is concerned with the most important health traits. As the RZRobot, the RZhealth is an independent breeding value, too.

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

67%

Fat-kg

33%


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

RZN relative breeding value longevity
The breeding value for longevity (RZN) has been published based on nine survival breeding values since April. These survival breeding values themselves represent nine phases of life. From first to fourth calving, the 3 lactations resulting from them are divided in three phases. So first, real survival information will be already available on the 50th day of the first lactation marking the end of the first phase. So all bulls will get – at the same time – longevity breeding values based on daughter information with the first daughter proven breeding values for milk production/cell score. In line with other relative breeding values, a RZN for A.I. bulls is published if daughter information (1st phase 1st lactation) is based 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.

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.

RZcalfhealth


In addition to the new health breeding values and the already existing breeding value for stillbirths, it is now possible to develop a breeding value for the fitness and vitality of calves in the rearing period on the basis of the comprehensive data basis. Based on the data of approximately 8 million female calves born since 2006, the new RZcalfhealth describes the genetic ability to survive the rearing period from day 2 to 15 months of age. Only female calves are considered here as male calves usually are sold to fattening farms with 14 days of age. As losses within the different age segments are caused by different diseases, a distinction is made in the estimation model between five age segments (days 3-14, 15-60, 61-120, 121-200, 201-458). The RZcalfhealth is shown on the usual relative scale with an average of 100 and a genetic spread of 12. The reliability of the pure genomic RZcalfhealth is 51 %.

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

Catálogo de Toros 2019/2020

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