Impact of the relative emphasis on growth and litter size in a maternal index for selecting sheep

Selection responses in sheep were predicted for a maternal index with different emphases on litter size and lamb growth to assess the need for correct economic values. Ratios of economic values for litter size relative to growth from 2 to 200 were tested. Genetic change per generation in market weig...

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Veröffentlicht in:	Canadian journal of animal science 2004-12, Vol.84 (4), p.713-715
Hauptverfasser:	Tosh, J.J, Wilton, J.W
Format:	Artikel
Sprache:	eng
Schlagworte:	animal growth body weight breeding value economic analysis food animals genetic improvement genotype lambs litter size maternal effect selection criteria sheep
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container_title	Canadian journal of animal science
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creator	Tosh, J.J Wilton, J.W
description	Selection responses in sheep were predicted for a maternal index with different emphases on litter size and lamb growth to assess the need for correct economic values. Ratios of economic values for litter size relative to growth from 2 to 200 were tested. Genetic change per generation in market weight of lambs (1.75 to 0.03 kg) was sensitive, but genetic change per generation in number of lambs born (0.11 to 0.17) was practically independent of the economic values applied in the index.
doi_str_mv	10.4141/A04-012
format	Article
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Genetic change per generation in market weight of lambs (1.75 to 0.03 kg) was sensitive, but genetic change per generation in number of lambs born (0.11 to 0.17) was practically independent of the economic values applied in the index.</description><identifier>ISSN: 0008-3984</identifier><identifier>EISSN: 1918-1825</identifier><identifier>DOI: 10.4141/A04-012</identifier><language>eng</language><subject>animal growth ; body weight ; breeding value ; economic analysis ; food animals ; genetic improvement ; genotype ; lambs ; litter size ; maternal effect ; selection criteria ; sheep</subject><ispartof>Canadian journal of animal science, 2004-12, Vol.84 (4), p.713-715</ispartof><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c282t-6c80700dc92417f6e64c56aefe2bc4b3d496dad260c6b793b501b775feffac703</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Tosh, J.J</creatorcontrib><creatorcontrib>Wilton, J.W</creatorcontrib><title>Impact of the relative emphasis on growth and litter size in a maternal index for selecting sheep</title><title>Canadian journal of animal science</title><description>Selection responses in sheep were predicted for a maternal index with different emphases on litter size and lamb growth to assess the need for correct economic values. 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ispartof	Canadian journal of animal science, 2004-12, Vol.84 (4), p.713-715
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language	eng
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source	EZB-FREE-00999 freely available EZB journals
subjects	animal growth body weight breeding value economic analysis food animals genetic improvement genotype lambs litter size maternal effect selection criteria sheep
title	Impact of the relative emphasis on growth and litter size in a maternal index for selecting sheep
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