PMID- 22444302
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20121002
LR  - 20120326
IS  - 1751-7311 (Print)
IS  - 1751-7311 (Linking)
VI  - 3
IP  - 3
DP  - 2009 Mar
TI  - Genetic parameters for milkability from the first three lactations in Fleckvieh 
      cows.
PG  - 329-35
LID - 10.1017/S1751731108003716 [doi]
AB  - Test-day records for average flow rate (AFR) from the routine dairy recording 
      from Bavarian Fleckvieh cows were analysed. Two data sets with observations on 
      approximately 20 000 cows each were sampled from the total data set. For the 
      estimation of variance parameters, a two-step approach was applied. In a first 
      step multiple-trait restricted maximum likelihood (REML) analyses were carried 
      out. For each of the first three lactations, six time periods with up to 33 days 
      were defined. An algorithm for iterative summing of expanded part matrices was 
      applied in order to combine the estimates. In a second step covariance functions 
      (CF) for additive-genetic variances and non-genetic animal variances were derived 
      using second-order Legendre polynomials plus an exponential term. Estimates of 
      test-day heritability for AFR ranged from 0.21 to 0.40, and were largest in 
      lactation 1. For lactations 1 and 3, heritabilities decreased considerably 
      towards the end of lactation. Genetic correlation estimates within lactation 
      decreased as the distance between days in milk (DIM) increased. Genetic 
      correlations between corresponding DIM in the three lactations were generally 
      large, ranging from 0.80 to 0.99. The largest estimates were found between DIM 
      from lactations 2 and 3. Results from this study suggest that including AFR data 
      from second and third lactations in genetic evaluation systems could the improve 
      accuracy of genetic selection.
FAU - Dodenhoff, J
AU  - Dodenhoff J
AD  - Bavarian State Research Center for Agriculture, Institute of Animal Breeding, 
      85586 Poing, Germany.
FAU - Emmerling, R
AU  - Emmerling R
LA  - eng
PT  - Journal Article
PL  - England
TA  - Animal
JT  - Animal : an international journal of animal bioscience
JID - 101303270
EDAT- 2009/03/01 00:00
MHDA- 2009/03/01 00:01
CRDT- 2012/03/27 06:00
PHST- 2012/03/27 06:00 [entrez]
PHST- 2009/03/01 00:00 [pubmed]
PHST- 2009/03/01 00:01 [medline]
AID - S1751731108003716 [pii]
AID - 10.1017/S1751731108003716 [doi]
PST - ppublish
SO  - Animal. 2009 Mar;3(3):329-35. doi: 10.1017/S1751731108003716.