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Efficiency of different selection indexes for desired gain by 'bending' of parameter estimates

Indian Agricultural Research Journals

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Title Efficiency of different selection indexes for desired gain by 'bending' of parameter estimates
 
Creator KHANNA, A S
JAISWAL, U C
 
Subject —
 
Description Data pertaining to 116 Holstein-Friesian X Hariana (F1) crossbred cows were utilized for evaluating the efficiency of different selection indexes for desired gains by 'bending' of parameter estimates. Indexes with breeding objectives of direct improvement in traits included in the index were superior in general, than those involving indirect breeding goals. These differences were distinct when indexes were made from original parameter estimates (without bending). In general. bending of parameter estimates, improved the efficiency of all indexes at all values of bending factor; however, 0.7 to 0.9 was the best in the present case. When improvement in lifetime production and breeding efficiency was the goal. the index constructed usingfirst lactation traits. i.e. age at first calving, first lactation yield and first calving interval required higher number of generations but was overall more efficient than the index incorporating lifetime traits, because of shorter generation interval (3.7 vs 6.0 years).
 
Publisher Directorate of Knowledge Management in Agriculture
 
Contributor —
 
Date 2013-05-29
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAnS/article/view/30527
 
Source The Indian Journal of Animal Sciences; Vol 64, No 4 (1994)
0367-8318
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAnS/article/view/30527/13700
 
Rights Copyright (c) 2014 The Indian Journal of Animal Sciences