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Evaluation of long-term selection for part period egg number in White Leghorn chicken-correlated responses*

Indian Agricultural Research Journals

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Title Evaluation of long-term selection for part period egg number in White Leghorn chicken-correlated responses*
 
Creator REDDY, B L N
SINGH, RAJVIR
KATARIA, M C
SHARMA, DEEPAK
 
Subject Birds, Correlated response, Long term selection, Selection, White Leghorn
 
Description Data on 20 659 pullets which were the progenies of 40 to 50 sires and 160 to 200 dams per generation of a strain (IWH) if White Leghorn under long term selection for part period egg production over 24 generations were studied. Realised genetic responses per generation in over all period were -0.92 day in ASM, 3.38G in 20 weeks bw, -4.92g in 40 weeks bw and -0.07g in 40 weeks egg weight. The decline in egg weight was comparatively much lower in later part as compared to early part of the study. Age at sexual maturity showed a significant decline over the period of selection and significant negative correlated response was observed in early periods. For 20 weeks body weight in the over all period realized observed in body weight at 40 weeks of age. There was poor agreememnt between expected and realized responses for all the correlated traits. Realized heritabilities were much lower in the last generation than the first generations.
 
Publisher Directorate of Knowledge Management in Agriculture
 
Contributor —
 
Date 2014-03-02
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
—
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAnS/article/view/38474
 
Source The Indian Journal of Animal Sciences; Vol 74, No 4 (2004)
0367-8318
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAnS/article/view/38474/17301
 
Rights Copyright (c) 2014 The Indian Journal of Animal Sciences