0.857
IF5
0.900
IF
Q3
JCR
0.92
CiteScore
0.405
SJR
Q2
SJR
20
MNiSW
165.24
ICV
ORIGINAL PAPER
 
CC-BY 4.0
 
 

Approximate accuracy of dairy cattle evaluation from multiple lactation random regression model for Polish Black-and-White cattle

T. Strabel 1  ,  
 
1
August Cieszkowski Agricultural University, Department of Genetics and Animal Breeding, Wołyńska 33, 60-637 Poznań, Poland
2
Centre for Genetic Improvement of Livestock, Department of Animal and Poultry Science, University of Guelph, Guelph, ON, N1G 2W1, Canada
3
National Research Institute of Animal Production, Department of Animal Genetics and Breeding, 32-083 Balice, Poland
J. Anim. Feed Sci. 2006;15(2):187–193
Publish date: 2006-04-12
KEYWORDS
ABSTRACT
A method is described to obtain approximate reliabilities for breeding values calculated with a multiple-lactation random regression test day model. The method was based on a concept of an equivalent number of progeny for animals with records, which is further used to derive reliabilities for related animals. The procedure accounted for the size of contemporary groups. Approximate reliabilities were calculated for estimated breeding values of the average milk yield in the first three lactations, using the data of daily milk yield of Polish Black-and-White cows in randomly selected herds. Results of approximation were analysed by comparison with corresponding exact reliabilities, obtained from the inverse of the coefficients matrix of the mixed model equations. High correlation of 0.98 for bulls between reliabilities from both methods and very low computer requirements facilitate the implementation of the approximate method into a routine genetic evaluation procedure.
CORRESPONDING AUTHOR
T. Strabel   
August Cieszkowski Agricultural University, Department of Genetics and Animal Breeding, Wołyńska 33, 60-637 Poznań, Poland
ISSN:1230-1388