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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
20/11/1996 |
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Data da última atualização: |
20/11/1996 |
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Autoria: |
RODEN, J. A. |
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Título: |
A comparison of alternative nucleus breeding systems and a sire referencing scheme for sheep improvement. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
Animal Science, v.62, n.2, p.265-270, 1996. |
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Idioma: |
Inglês |
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Conteúdo: |
Stochastic simulation was used to compare selection response and rate of inbreeding in four nucleus breeding systems and a sire referencing scheme for sheep: an open nucleus system (ONS), an open nucleus system with sequential selection of the nucleus (ONS-S), a sire referencing scheme (SRS) and a dispersed open nucleus system (DONS). Selection was based on best linear unbiased prediction of breeding values for a single trait measurable on all individuals prior to selection. Selection in a population of 1200 ewes equally divided into 10 flocks was simulated over a 15-year period. The mean rate of genetic gain was proportionately about 0.15 higher in ONS-S and DONS compared with ONS and SRS. The rate of inbreeding in SRS was considerably lower and in ONS-S, considerably higher, than in the other systems. The level of prolificacy in the population did not influence the relative ranking of the breeding systems but may have implicationsjor their optimal structure. |
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Palavras-Chave: |
Avaliacao de reprodutor. |
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Thesagro: |
Melhoramento; Ovino. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01436naa a2200157 a 4500
001 1516319
005 1996-11-20
008 1996 bl uuuu u00u1 u #d
100 1 $aRODEN, J. A.
245 $aA comparison of alternative nucleus breeding systems and a sire referencing scheme for sheep improvement.
260 $c1996
520 $aStochastic simulation was used to compare selection response and rate of inbreeding in four nucleus breeding systems and a sire referencing scheme for sheep: an open nucleus system (ONS), an open nucleus system with sequential selection of the nucleus (ONS-S), a sire referencing scheme (SRS) and a dispersed open nucleus system (DONS). Selection was based on best linear unbiased prediction of breeding values for a single trait measurable on all individuals prior to selection. Selection in a population of 1200 ewes equally divided into 10 flocks was simulated over a 15-year period. The mean rate of genetic gain was proportionately about 0.15 higher in ONS-S and DONS compared with ONS and SRS. The rate of inbreeding in SRS was considerably lower and in ONS-S, considerably higher, than in the other systems. The level of prolificacy in the population did not influence the relative ranking of the breeding systems but may have implicationsjor their optimal structure.
650 $aMelhoramento
650 $aOvino
653 $aAvaliacao de reprodutor
773 $tAnimal Science$gv.62, n.2, p.265-270, 1996.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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