Abstract
Taiwan native chicken strain (Taishu No. 7) carrying homozygous gene for heat shock
protein 70 (HSP70) was evaluated for heritability, genetic and phenotypic correlations
for body weight at birth (BW0), body weight at 16 weeks of age (BW16), egg weight
at first egg (FEW), body weight at first egg (BWFE), age at first egg (AFE) and number
of eggs laid up to 40 weeks of age (EN40) in female chickens. The multivariate animal
model using the residual maximum likelihood procedure was applied. The estimations
realized over three generations and the pedigree file was composed of 141 individuals.
Heritability estimates of BW0, BW16, FEW, AFE, BWFE, and EN40 were 0.306,
0.763, 0.071, 0.284, 0.681, and 0.200, respectively. The body weight traits showed that
the BW16 had the negative genetic correlations with BW0, AFE, and EN40 (rg = –
0.061; rg = –0.242; rg = –0.087), but had the positive genetic correlations with FEW and
BWFE (rg =0.419; rg =0.945). The egg production traits showed that the EN40 had the
negative genetic correlations with BW16 and AFE (rg= –0.087; rg = –0.195), but had
the positive genetic correlation with BW0, FEW, and BWFE (rg = 0.336; rg = 0.039; rg
=0.182). Based on the results of this study, the BWFE could be introduced as a suitable
indirect selection criteria for improving egg production because of the higher
heritability and a positive genetic correlation with egg production.
Kang Shann, Lin Cheng, Lin Der, Huang Tsung, Liang Hsiao. (2018) Genetic parameters for body weight and egg production traits in Taiwan native chicken homozygous for the heat shock protein 70 gene, Asian Journal of Agriculture and Biology, Volume 6, Issue 3.
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