Status as of: 2019-08-12

Form GE

DESCRIPTION OF NATIONAL GENETIC EVALUATION SYSTEMS

Country (or countries)	Czech Republic	
Main trait group1	Udder Health	
Breed(s)	Holstein	
Trait definition(s) and unit(s) of measurement2
Attach an appendix if needed	Unit of measurement: Somatic Cell Count (SCC) (1000cells/1ml)
Trait definition: Somatic Cell Score (SCS)
SCS = log2(SCC/100) + 3
	
Method of measuring and collecting data	Milk recording data. 
24-hour production collected by milk recording organizations 
every four weeks.	
Time period for data inclusion	Lactations with calving since January 1st 1995 and later.
Pedigree information of 4 generations.	
Age groups (e.g. parities) included	First 3 lactations, parities 1 to 3 without weights.	
Other criteria (data edits) for inclusion of records	The breed of cows: Hol >= 75%.	
Criteria for extension of records (if applicable)	No extension of records is required.	
Sire categories	All sires.	
Environmental effects3, pre-adjustments 	None	
Method (model) of genetic evaluation3	ST-ML-RR-TD-BLUP-AM	
Environmental effects3 in the genetic evaluation model	Herd-test day- parity (F)
Regressions on DIM with parity-season-year-service period-age at first calving or calving interval for later lactations (F)	
Adjustment for heterogeneous variance in evaluation model	No	
Use of genetic groups and relationships	Phantom parent groups are defined according to blood of others breeds and birth year.	
Blending of foreign/Interbull information in evaluation	No.	
Genetic parameters in the evaluation	see Appendix	
System validation	Correlations between mothers and daughters.
Interbull trend validation methods I, III.	
Expression of genetic evaluations
If standardised (e.g. RBV), give standardisation formula in the appendix	EBVlact is calculated as sum of test day EBV from 5 day to day 305.
EBVtot is calculated as average of all three lactations without weights.
RBV is used for publication (high values are desirable).
(standardization formula in appendix)	
Definition of genetic reference base
Next base change	Bulls born in 2010.

Calculation of reliability	R = SW / (SW + K) ; SW = effective number of daughters 
                                 K = (1 – h2) / h2	
Criteria for official publication of evaluations	minimum number of herds = 10	
Number of evaluations / publications per year	6	
Use in total merit index4	TMI = 0.49*Production + 0.15*Fertility + 0.07*UdderHealth + 
  + 0.05*Longevity + 0.24*Conformation
TMI = 0.225*ProteinKG + 0.115*FatKG + 0.11*Protein% + 
  + 0.04*Fat% + 0.075* heifersCR+ 0.075*CowCR +   
  + 0.07*SomaticCells + 0.05*Longevity + 0.06*Feet&Legs +
  + 0.0225*FootAngle(#) + 0.01*RearLegRearView(#) 
  + 0.0175* Locomotion(#) + 0.0375*UdderDepth(#)  +
  + 0.025*ForeUdderAttachment(#)  + 0.0225*UdderSupport(#)  +
  + 0.0125*RearTeatPlacement(#)  + 0.01625*RearUdderHeight(#)  +         
  + 0.01625*TeatLength(#)
TMI is standardized to mean 100 and st. dev. 12. Traits marked as (#) are only for purpose of TMI computation reaching highest value in optimum for each trait (since 08/2019).	
Anticipated changes in the near future		
Key reference on methodology applied	Dedkova Ludmila, Nemcova Eva: Metodika odhadu plemenne hodnoty pro mlecnou uzikovost skotu test-day modelem
NAZV QC 1235/2003	
Key organisation: name, address, phone, fax, e-mail, web site	Czech Moravian Breeders’ Corporation
252 09 Hradistko, Benesovska123
Ph.  ++420 257 896 444
Fax. ++420 257 740 491
e-mail: cmsch@cmsch.cz
web-site: www.cmsch.cz
               www.plemdat.cz	
		
1) Either: Production (e.g. milk, fat, protein), Conformation, Health (e.g. mastitis resistance, milk somatic cell, resistance to diseases other than mastitis), Longevity, Calving (e.g. stillbirth, calving ease), Female fertility (e.g. non-return rate, interval between reproductive events, number of AI’s, heat strength), Workability (e.g. milking speed, temperament), Beef production, Efficiency (e.g. body weight, energy balance, body conditioning score), or Other traits.
2) Indicate frequencies per category if the trait is categorical and specify transformation of data if practiced.
3) Use abbreviations for most common effects (see document with list of abbreviations at http://www-interbull.slu.se/service_documentation/General/list_of_abbreviations.rtf) and indicate random (R) or fixed (F).
4) Please give economic weights and indicate how they are expressed (preferably in genetic standard deviation units).

Form GE	Appendix GE

Parameters used in genetic evaluation

Country (or countries):	Czech Republic	
Main trait group:	Udder Health	
Breed (repeat as necessary):	Holstein	

Trait	Definition	ITBa	h2b	genetic
varianceb	official proof
standardisation formulac	
Milk somatic cell	Somatic Cell Score	X	0.301	21 468	See appendix SM	

						

						

						

						

						
						
a	Indicate, with X, traits that are submitted to Interbull for international genetic evaluations.
b	If repeated records are treated as separate traits, provide heritability estimates and genetic variances separately for each trait, as well as for all traits pooled, i.e. for the trait submitted to Interbull.
c	Expressed as follows:
StandEval=((eval-a)/b)*c+d where a=mean of the base adjustment, b=standard deviation of the base, c=standard deviation of expression (include sign if scale is reversed), and d=base of expression.

Form GE	Appendix SM

Parameters for national genetic evaluations for udder health traits as provided to Interbull

Country (or countries):	Czech Republic	
Main trait group:	Udder Health	
Breed(s):	Holstein	

Trait	h2a	genetic
variancea	official proof
standardisation formulab *	
Somatic Cell Score:
lactation 1
lactation 2
lactation 3
lactations pooled	
0.207
0.225
0.187
0.301	
19 350
24 254
23 493
21 468	a = average of bulls born in 1995
b = standard deviation of bulls born in 1995
c = 12
d = 100	
Clinical Mastitis:
				
a	If repeated records are treated as separate traits, provide heritability estimates and genetic variances separately for each trait, as well as for all traits pooled, i.e. for the trait submitted to Interbull.
b	Expressed as follows:
StandEval=((eval-a)/b)*c+d where a=mean of the base adjustment, b=standard deviation of the base, c=standard deviation of expression (include sign if scale is reversed), and d=base of expression.

* Standardization formula is valid for each lactation separately and for EBV submitted to Interbull too, but for this one is a = 0.

Table 1: Genetic correlations (above diagonal) and PE correlations (bellow diagonal) (Holstein breed)

SCS	lact. 1	lact. 2	lact. 3	
lact. 1	-	0.933	0.928	
lact. 2	0.369	-	0.966	
lact. 3	0.262	0.464	-	

Table 2: Genetic covariance matrix for 6-305 day (Holstein breed)

SCS	lact. 1	lact. 2	lact. 3	
lact. 1	19 350	20 213	19790	
lact. 2	20 213	24 254	23 056	
lact. 3	19 790	23 056	23 493	

Table 3: PE covariance matrix for 6-305 day (Holstein breed)

SCS	lact. 1	lact. 2	lact. 3	
lact. 1	73 728	28 842	22 708	
lact. 2	28 842	83 023	42 647	
lact. 3	22 708	42 647	101 685	

Table 4: Residual covariance matrix for 6-305 day (Holstein breed)

SCS	lact. 1	lact. 2	lact. 3	
lact. 1	362.45	0	0	
lact. 2	0	375.58	0	
lact. 3	0	0	383.78