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
 
 

Direct, maternal and cytoplasmic variance estimates of egg production traits in laying hens

M. Bednarczyk 2,  
 
1
Department of Genetics and Animal Breeding, August Cieszkowski Agricultural University, Wolyńska 33, 60-637 Poznań, Poland
2
Research Institute of Animal Production, Poultry Research Branch, Zakrzewo n/Poznań, 62-069 Palędzie, Poland
J. Anim. Feed Sci. 1999;8(4):589–598
Publish date: 1999-10-07
KEYWORDS
ABSTRACT
Initial egg production (IEP), egg weight (EW) and body weight (BW) of four laying hen lines were studied. A total of 74044 individuals from six selected generations were included in the analysis. The data (after Box-Cox transformation) were used to estimate direct and maternal additive genetic variances as well as cytoplasmic variances. Estimation of variance components was performed by the derivative-free REML programs of Meyer (1989). The largest genetic variance component estimates were obtained for IEP. However, the contributions of variances from both maternal (indirect) and cytoplasmic effects to phenotypic variance were very small for all analyzed traits. It was concluded that the maternal and cytoplasmic effects studied may be omitted in laying hen genetic evaluation.
 
CITATIONS (1):
1. Multivariate analysis of mixed inheritance model of performance traits in layers using Gibbs sampling
T. Szwaczkowski, M. Szydlowski, K. Molinski, A. Dobek
Journal of Animal Breeding and Genetics
ISSN:1230-1388