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Registro Completo |
Biblioteca(s): |
Embrapa Caprinos e Ovinos; Embrapa Pecuária Sul. |
Data corrente: |
25/11/2002 |
Data da última atualização: |
25/11/2002 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
BENAVIDES, M. V.; MAHER, A. P. |
Título: |
Quantitative genetic studies on wool yellowing in Corriedale sheep. II. Clean wool colour and wool production traits: genetic parameter stimates and economic returns. |
Ano de publicação: |
2000 |
Fonte/Imprenta: |
Australian Journal of Agricultural Research, v. 51, n. 2, p. 191-196, 2000. |
Idioma: |
Inglês |
Conteúdo: |
The potential for improvement of clean wool colour (CWC) in Corriedale sheep via selection was examined. The heritability, and phenotypic and genetic correlations, of CWC, brightness (Y), greasy (GFW) and clean (CFW) fleece weights , yield percentage (Yield), mean fibre diameter (MFD), and visual colour score were estimated from 440 progeny of 19 sires of a Corriedale flock using restricted maximum likelihood (REML) procedures with average information algorithm (AIREML).
The heritability of CWC was estimated at 0.27+-0.13. Clean wool colour showed strong positive genetic correlations with CFW and MFD. Visual colour score and CWC were also positively genetically correlated. As expected, direct selection criteria against MFD, CWC, or visual colour score would reduce CWC; however, direct selection M against MFD would improve clean wool colour with negligible reductions on CFW, thus resulting in small economic gains.
Several selection indices were calculated having either CFW, MFD, and CWC or CFW and MFD as selection criteria. The b-values of an unrestricted index were estimated at I1 =+ 1.15 CFW + 0.13 MFD + 0.43.CWC, with positive correlated responses for all 3 breeding objective traits (CFW, MFD, and CWC). A second index, where CFW was restricted to nil genetic change, was estimated at: I2 = + 0.14 CFW - 0.02 MFD + 0.01 CWC. This index was expected to cause a negligible genetic gain for CWC (-0.04 Y-Z units/head.year). To avoid economic losses with the reduction on CFW, a third selection index was calculated where CWC was restricted to nil change. The index was estimated at I3 = +0.61 CFW - 0.07 MFD + 0.02 CWC with expected increases in CFW and decreases in MFD. Selection indices with (a) CFW and MFD (4) and (b) CFW, MFD, and visual colour score (15) as selection criteria would increase CFW, MFD, and CWC at the same rates observed in I1. MenosThe potential for improvement of clean wool colour (CWC) in Corriedale sheep via selection was examined. The heritability, and phenotypic and genetic correlations, of CWC, brightness (Y), greasy (GFW) and clean (CFW) fleece weights , yield percentage (Yield), mean fibre diameter (MFD), and visual colour score were estimated from 440 progeny of 19 sires of a Corriedale flock using restricted maximum likelihood (REML) procedures with average information algorithm (AIREML).
The heritability of CWC was estimated at 0.27+-0.13. Clean wool colour showed strong positive genetic correlations with CFW and MFD. Visual colour score and CWC were also positively genetically correlated. As expected, direct selection criteria against MFD, CWC, or visual colour score would reduce CWC; however, direct selection M against MFD would improve clean wool colour with negligible reductions on CFW, thus resulting in small economic gains.
Several selection indices were calculated having either CFW, MFD, and CWC or CFW and MFD as selection criteria. The b-values of an unrestricted index were estimated at I1 =+ 1.15 CFW + 0.13 MFD + 0.43.CWC, with positive correlated responses for all 3 breeding objective traits (CFW, MFD, and CWC). A second index, where CFW was restricted to nil genetic change, was estimated at: I2 = + 0.14 CFW - 0.02 MFD + 0.01 CWC. This index was expected to cause a negligible genetic gain for CWC (-0.04 Y-Z units/head.year). To avoid economic losses with the reduction on CFW, a thi... Mostrar Tudo |
Palavras-Chave: |
Melhoramento genético; Raça Corriedale; Viabilidade econômica. |
Thesagro: |
Lã; Ovino; Parâmetro Genético. |
Categoria do assunto: |
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Marc: |
LEADER 02578naa a2200205 a 4500 001 1528897 005 2002-11-25 008 2000 bl uuuu u00u1 u #d 100 1 $aBENAVIDES, M. V. 245 $aQuantitative genetic studies on wool yellowing in Corriedale sheep. II. Clean wool colour and wool production traits$bgenetic parameter stimates and economic returns.$h[electronic resource] 260 $c2000 520 $aThe potential for improvement of clean wool colour (CWC) in Corriedale sheep via selection was examined. The heritability, and phenotypic and genetic correlations, of CWC, brightness (Y), greasy (GFW) and clean (CFW) fleece weights , yield percentage (Yield), mean fibre diameter (MFD), and visual colour score were estimated from 440 progeny of 19 sires of a Corriedale flock using restricted maximum likelihood (REML) procedures with average information algorithm (AIREML). The heritability of CWC was estimated at 0.27+-0.13. Clean wool colour showed strong positive genetic correlations with CFW and MFD. Visual colour score and CWC were also positively genetically correlated. As expected, direct selection criteria against MFD, CWC, or visual colour score would reduce CWC; however, direct selection M against MFD would improve clean wool colour with negligible reductions on CFW, thus resulting in small economic gains. Several selection indices were calculated having either CFW, MFD, and CWC or CFW and MFD as selection criteria. The b-values of an unrestricted index were estimated at I1 =+ 1.15 CFW + 0.13 MFD + 0.43.CWC, with positive correlated responses for all 3 breeding objective traits (CFW, MFD, and CWC). A second index, where CFW was restricted to nil genetic change, was estimated at: I2 = + 0.14 CFW - 0.02 MFD + 0.01 CWC. This index was expected to cause a negligible genetic gain for CWC (-0.04 Y-Z units/head.year). To avoid economic losses with the reduction on CFW, a third selection index was calculated where CWC was restricted to nil change. The index was estimated at I3 = +0.61 CFW - 0.07 MFD + 0.02 CWC with expected increases in CFW and decreases in MFD. Selection indices with (a) CFW and MFD (4) and (b) CFW, MFD, and visual colour score (15) as selection criteria would increase CFW, MFD, and CWC at the same rates observed in I1. 650 $aLã 650 $aOvino 650 $aParâmetro Genético 653 $aMelhoramento genético 653 $aRaça Corriedale 653 $aViabilidade econômica 700 1 $aMAHER, A. P. 773 $tAustralian Journal of Agricultural Research$gv. 51, n. 2, p. 191-196, 2000.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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Registro Completo
Biblioteca(s): |
Embrapa Pecuária Sudeste. |
Data corrente: |
27/07/2011 |
Data da última atualização: |
04/01/2012 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
SCALEZ, D. C. B.; FRAGOMENI, B. de O.; COSTA, P. S. T. da; PASSAFARO, T. L.; TORAL, F. L. B.; ALENCAR, M. M. de. |
Afiliação: |
DAIANE CRISTINA BECKER SCALEZ, MESTRANDA PÓS-GRADUAÇÃO EM CIÊNCIA ANIMAL DA FAMEVZ/UFMT/CAMPO GRANDE; BRENO DE OLIVEIRA FRAGOMENI, UNIVERSIDADE FEDERAL DE MINAS GERAIS/BELO HORIZONTE, MG; PAULA SOUZA TEIXEIRA DA COSTA, UNIVERSIDADE FEDERAL DE MINAS GERAIS/BELO HORIZONTE; TIAGO LUCIANO PASSAFARO, UNIVERSIDADE FEDERAL DE MINAS GERAIS/BELO HORIZONTE; FÁBIO LUIZ BURANELO TORAL, UNIVERSIDADE FEDERAL DE MINAS GERAIS/BELO HORIZONTE; MAURICIO MELLO DE ALENCAR, CPPSE. |
Título: |
Polinômios para modelar a trajetória de crescimento de tourinhos em provas de ganho em peso. |
Ano de publicação: |
2011 |
Fonte/Imprenta: |
In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 48., 2011, Belém. O Desenvolvimento da produção animal e a responsabilidade frente a novos desafios - anais. Belém: SBZ: UFRA, 2011. |
Idioma: |
Português |
Conteúdo: |
Este trabalho foi realizado com o objetivo de identificar o tipo de polinômio e a ordem de ajuste mais adequados para modelagem da trajetória média de crescimento de tourinhos Nelore, MA (21/32 Charolês + 11/32 Nelore) e Canchim em provas de ganho em peso. As trajetórias médias de crescimento foram ajustadas por meio de polinômios ordinários e de Legendre (linear até quíntico) e Bsplines quadráticos (com dois até seis intervalos regulares). Nas comparações envolvendo apenas os modelos com os mesmos números de parâmetros, os B-splines promoveram os melhores ajustes. O modelo com polinômio B-spline com seis intervalos foi considerado como o melhor para as raças Canchim e MA. Para a raça Nelore, o B-spline com quatro intervalos foi o modelo com melhor ajuste de acordo com o Critério de Informação de Akaike Consistente. |
Palavras-Chave: |
B-spline; Polinômio de Legendre; Polinômio ordinário; Regressão aleatória. |
Categoria do assunto: |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/38623/1/PROCI-2011.00070.pdf
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Marc: |
LEADER 01651nam a2200217 a 4500 001 1896819 005 2012-01-04 008 2011 bl uuuu u00u1 u #d 100 1 $aSCALEZ, D. C. B. 245 $aPolinômios para modelar a trajetória de crescimento de tourinhos em provas de ganho em peso. 260 $aIn: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 48., 2011, Belém. O Desenvolvimento da produção animal e a responsabilidade frente a novos desafios - anais. Belém: SBZ: UFRA$c2011 520 $aEste trabalho foi realizado com o objetivo de identificar o tipo de polinômio e a ordem de ajuste mais adequados para modelagem da trajetória média de crescimento de tourinhos Nelore, MA (21/32 Charolês + 11/32 Nelore) e Canchim em provas de ganho em peso. As trajetórias médias de crescimento foram ajustadas por meio de polinômios ordinários e de Legendre (linear até quíntico) e Bsplines quadráticos (com dois até seis intervalos regulares). Nas comparações envolvendo apenas os modelos com os mesmos números de parâmetros, os B-splines promoveram os melhores ajustes. O modelo com polinômio B-spline com seis intervalos foi considerado como o melhor para as raças Canchim e MA. Para a raça Nelore, o B-spline com quatro intervalos foi o modelo com melhor ajuste de acordo com o Critério de Informação de Akaike Consistente. 653 $aB-spline 653 $aPolinômio de Legendre 653 $aPolinômio ordinário 653 $aRegressão aleatória 700 1 $aFRAGOMENI, B. de O. 700 1 $aCOSTA, P. S. T. da 700 1 $aPASSAFARO, T. L. 700 1 $aTORAL, F. L. B. 700 1 $aALENCAR, M. M. de
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Embrapa Pecuária Sudeste (CPPSE) |
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