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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte; Embrapa Pantanal; Embrapa Suínos e Aves. |
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Data corrente: |
07/05/1997 |
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Data da última atualização: |
15/01/2014 |
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Autoria: |
IRGANG, R. |
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Título: |
Direct and correlated responses to selection for weaning weight and postweaning gain in Hereford cattle. |
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Ano de publicação: |
1984 |
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Fonte/Imprenta: |
Raleigh: North Carolina State University, 1984. |
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Páginas: |
165p. |
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Idioma: |
Inglês |
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Notas: |
Tese Doutorado. |
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Conteúdo: |
Single trait selection was practiced in three lines of Hereford cattle derived from a common base population. Bulls were selected within sire families for increased weaning weight (WW) in line WWL, increased postweaning gain (PG) in line PGL and ramdomly selected in the control line (CTL). The data consist of 2,467 progeny produced from 1967 to 1981 by 125 sires and 922 dams. After 3 years of stablishing the foundation population, 12 years of continuous selection resulted in slightly less than two generations of selection of selection and in low inbreeding coefficients. Direct selection applied to either WW or PG improved both traits. However, selection for PG increased both PG and WW faster than selection for WW. Selection for WW and for PG increased milk production, preweaning daily gain, yearling weight and feed intake. Correlated responses in these traits were larger in PGL than in WWL. Selection for either WW or PG also increased the amount of fatness in bulls in feedlot. However, it did not result in any or PG also increased the amount of fatness in bulls in feedlot. However, it did not result in any significant change in feed efficiency. Increased birth weight was observed from PG selection but not from WW selection. Realized heritabilities and regression coefficients of correlated responses on cumulative selection differentials, estimated from "quasi-replicates" generated by grouping individual descendents from sires utilized in different years of the foundation population, indicated that genetic drift affected responses to selection and suggest that replication of selection experiments is necessary... MenosSingle trait selection was practiced in three lines of Hereford cattle derived from a common base population. Bulls were selected within sire families for increased weaning weight (WW) in line WWL, increased postweaning gain (PG) in line PGL and ramdomly selected in the control line (CTL). The data consist of 2,467 progeny produced from 1967 to 1981 by 125 sires and 922 dams. After 3 years of stablishing the foundation population, 12 years of continuous selection resulted in slightly less than two generations of selection of selection and in low inbreeding coefficients. Direct selection applied to either WW or PG improved both traits. However, selection for PG increased both PG and WW faster than selection for WW. Selection for WW and for PG increased milk production, preweaning daily gain, yearling weight and feed intake. Correlated responses in these traits were larger in PGL than in WWL. Selection for either WW or PG also increased the amount of fatness in bulls in feedlot. However, it did not result in any or PG also increased the amount of fatness in bulls in feedlot. However, it did not result in any significant change in feed efficiency. Increased birth weight was observed from PG selection but not from WW selection. Realized heritabilities and regression coefficients of correlated responses on cumulative selection differentials, estimated from "quasi-replicates" generated by grouping individual descendents from sires utilized in different years of the foundation popu... Mostrar Tudo |
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Palavras-Chave: |
Beefcattle; Fat; Feed efficiency; Growth; Production; Selection. |
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Thesagro: |
Alimentação; Crescimento; Desmama; Gado; Gado de Corte; Gordura; Leite; Peso; Produção Animal; Seleção; Zootecnia. |
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Thesaurus Nal: |
beef cattle; cattle; milk; weaning weight. |
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Categoria do assunto: |
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Marc: |
LEADER 02585nam a2200385 a 4500
001 1323224
005 2014-01-15
008 1984 bl uuuu m 00u1 u #d
100 1 $aIRGANG, R.
245 $aDirect and correlated responses to selection for weaning weight and postweaning gain in Hereford cattle.
260 $aRaleigh: North Carolina State University$c1984
300 $a165p.
500 $aTese Doutorado.
520 $aSingle trait selection was practiced in three lines of Hereford cattle derived from a common base population. Bulls were selected within sire families for increased weaning weight (WW) in line WWL, increased postweaning gain (PG) in line PGL and ramdomly selected in the control line (CTL). The data consist of 2,467 progeny produced from 1967 to 1981 by 125 sires and 922 dams. After 3 years of stablishing the foundation population, 12 years of continuous selection resulted in slightly less than two generations of selection of selection and in low inbreeding coefficients. Direct selection applied to either WW or PG improved both traits. However, selection for PG increased both PG and WW faster than selection for WW. Selection for WW and for PG increased milk production, preweaning daily gain, yearling weight and feed intake. Correlated responses in these traits were larger in PGL than in WWL. Selection for either WW or PG also increased the amount of fatness in bulls in feedlot. However, it did not result in any or PG also increased the amount of fatness in bulls in feedlot. However, it did not result in any significant change in feed efficiency. Increased birth weight was observed from PG selection but not from WW selection. Realized heritabilities and regression coefficients of correlated responses on cumulative selection differentials, estimated from "quasi-replicates" generated by grouping individual descendents from sires utilized in different years of the foundation population, indicated that genetic drift affected responses to selection and suggest that replication of selection experiments is necessary...
650 $abeef cattle
650 $acattle
650 $amilk
650 $aweaning weight
650 $aAlimentação
650 $aCrescimento
650 $aDesmama
650 $aGado
650 $aGado de Corte
650 $aGordura
650 $aLeite
650 $aPeso
650 $aProdução Animal
650 $aSeleção
650 $aZootecnia
653 $aBeefcattle
653 $aFat
653 $aFeed efficiency
653 $aGrowth
653 $aProduction
653 $aSelection
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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| Registros recuperados : 44 | |
| 10. |  | SARALEGUI, W. H.; IRGANG, R. Estrutura genética de um rebanho de suínos Landrace. III - Populações de pedigree dos Estados do Paraná, São Paulo e Minas Gerais. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 16, n. 6, p. 855-865, nov./dez. 1981 Título em inglês: Genetic structure of three landrace swine herds in Paraná, São Paulo and Minas Gerais States of Brazil.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 19. | | IRGANG, R.; SCHEID, I. R.; WENTZ, IVO; FAVERO, J. A. Ovulation rate, embryo number and uterus length in purebred and crossbred Duroc, Landrace and Large White gilts. Livestock Producion Science, v.33, n. 3/4, p.253-266, 1993.| Biblioteca(s): Embrapa Suínos e Aves. |
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| Registros recuperados : 44 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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