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Biblioteca(s): |
Embrapa Pecuária Sul. |
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Data corrente: |
18/09/2018 |
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Data da última atualização: |
18/09/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BENAVIDES, M. V.; MAHER, A. P.; YOUNG, M. J.; BEATSON, P. R.; REID, T. C. |
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Afiliação: |
MAGDA VIEIRA BENAVIDES, CPPSUL; A. P. Maher; M. J. Young; P. R. Beatson; T. C. Reid. |
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Título: |
Quantitative genetic studies on wool yellowing in Corriedale sheep: 1: Wool yellowing susceptibility and wool production traits|genetic parameter estimates. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Australian Journal of Agricultural Research, v. 49, n. 8, p. 1195-1201, 1998. |
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Idioma: |
Inglês |
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Conteúdo: |
The potential for the reduction of wool yellowing susceptibility (YPC) in Corriedale sheep via selection was examined. The heritabilities of YPC and greasy fleece weight (GFW) and clean fleece weight (CFW), yield percentage (Yield), mean fibre diameter (MFD), and subjective greasy wool colour assessment (Visual), and phenotypic and genetic correlations among these traits were estimated from records on 1492 progeny of 53 sires of a Corriedale flock by using restricted maximum likelihood procedures using an average information algorithm. The heritability of YPC was 0·27 ± 0·06. Genetic correlations between YPC and GFW, CFW, Yield, MFD, and Visual were 0·20 ± 0·14, 0·11 ± 0·14, ?0·15 ± 0·13, 0·24 ± 0·14, and 0·95 ± 0·06, respectively. Phenotypic correlations were low between these traits and YPC. Visual had a heritability of 0·30 ± 0·06 and medium-high genetic correlations with all traits, except CFW. Heritability estimates of GFW, CFW, Yield, and MFD were 0·55 ± 0·07, 0·52 ± 0·07, 0·51 ± 0·07, and 0·52 ± 0·07, respectively. The expected correlated responses to selection against YPC are likely to cause reductions in CFW and MFD. Correlated responses from the reduction of Visual are predicted to be greater for all production traits than those from the reduction of YPC. Responses in YPC are predicted to be slightly higher when selection is on Visual (?0·21 score/year) than when selection is on YPC itself (?0·19 score/year). A selection index, including CFW, MFD, and YPC as aggregate breeding and breeding objective traits, calculated at I = +3·26CFW ? 0·14MFD + 0·03YPC, predicted a YPC increase, worsening the problem. MenosThe potential for the reduction of wool yellowing susceptibility (YPC) in Corriedale sheep via selection was examined. The heritabilities of YPC and greasy fleece weight (GFW) and clean fleece weight (CFW), yield percentage (Yield), mean fibre diameter (MFD), and subjective greasy wool colour assessment (Visual), and phenotypic and genetic correlations among these traits were estimated from records on 1492 progeny of 53 sires of a Corriedale flock by using restricted maximum likelihood procedures using an average information algorithm. The heritability of YPC was 0·27 ± 0·06. Genetic correlations between YPC and GFW, CFW, Yield, MFD, and Visual were 0·20 ± 0·14, 0·11 ± 0·14, ?0·15 ± 0·13, 0·24 ± 0·14, and 0·95 ± 0·06, respectively. Phenotypic correlations were low between these traits and YPC. Visual had a heritability of 0·30 ± 0·06 and medium-high genetic correlations with all traits, except CFW. Heritability estimates of GFW, CFW, Yield, and MFD were 0·55 ± 0·07, 0·52 ± 0·07, 0·51 ± 0·07, and 0·52 ± 0·07, respectively. The expected correlated responses to selection against YPC are likely to cause reductions in CFW and MFD. Correlated responses from the reduction of Visual are predicted to be greater for all production traits than those from the reduction of YPC. Responses in YPC are predicted to be slightly higher when selection is on Visual (?0·21 score/year) than when selection is on YPC itself (?0·19 score/year). A selection index, including CFW, MFD, and YPC as aggreg... Mostrar Tudo |
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Thesagro: |
Lã; Ovino; Parâmetro Genético. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02356naa a2200205 a 4500
001 2095930
005 2018-09-18
008 1998 bl uuuu u00u1 u #d
100 1 $aBENAVIDES, M. V.
245 $aQuantitative genetic studies on wool yellowing in Corriedale sheep$b1: Wool yellowing susceptibility and wool production traits|genetic parameter estimates.$h[electronic resource]
260 $c1998
520 $aThe potential for the reduction of wool yellowing susceptibility (YPC) in Corriedale sheep via selection was examined. The heritabilities of YPC and greasy fleece weight (GFW) and clean fleece weight (CFW), yield percentage (Yield), mean fibre diameter (MFD), and subjective greasy wool colour assessment (Visual), and phenotypic and genetic correlations among these traits were estimated from records on 1492 progeny of 53 sires of a Corriedale flock by using restricted maximum likelihood procedures using an average information algorithm. The heritability of YPC was 0·27 ± 0·06. Genetic correlations between YPC and GFW, CFW, Yield, MFD, and Visual were 0·20 ± 0·14, 0·11 ± 0·14, ?0·15 ± 0·13, 0·24 ± 0·14, and 0·95 ± 0·06, respectively. Phenotypic correlations were low between these traits and YPC. Visual had a heritability of 0·30 ± 0·06 and medium-high genetic correlations with all traits, except CFW. Heritability estimates of GFW, CFW, Yield, and MFD were 0·55 ± 0·07, 0·52 ± 0·07, 0·51 ± 0·07, and 0·52 ± 0·07, respectively. The expected correlated responses to selection against YPC are likely to cause reductions in CFW and MFD. Correlated responses from the reduction of Visual are predicted to be greater for all production traits than those from the reduction of YPC. Responses in YPC are predicted to be slightly higher when selection is on Visual (?0·21 score/year) than when selection is on YPC itself (?0·19 score/year). A selection index, including CFW, MFD, and YPC as aggregate breeding and breeding objective traits, calculated at I = +3·26CFW ? 0·14MFD + 0·03YPC, predicted a YPC increase, worsening the problem.
650 $aLã
650 $aOvino
650 $aParâmetro Genético
700 1 $aMAHER, A. P.
700 1 $aYOUNG, M. J.
700 1 $aBEATSON, P. R.
700 1 $aREID, T. C.
773 $tAustralian Journal of Agricultural Research$gv. 49, n. 8, p. 1195-1201, 1998.
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