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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
09/03/2017 |
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Data da última atualização: |
09/03/2017 |
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Autoria: |
SINGH, R. N.; ACHARYA, R. M. |
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Título: |
Beetal goat: genetic selection for maximizing lifetime milk production. |
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Ano de publicação: |
1980 |
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Fonte/Imprenta: |
International Goat and Sheep Research, v. 1 n. 3, p. 226-233, 1980. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Data were analysed on the performance of 1439 goats in 3829 lactations recorded in 1931-67. Least-squares means are tabulated for age at 1st kidding, milk yield and lactation length (first 5 lactations), and kidding interval. Age at 1st kidding averaged 776.09 plus or minus 5.26 days. Milk yield ranged from 130.08 plus or minus 0.79 kg in the 1st lactation to 211.74 plus or minus 2.60 kg in the 3rd. Lactation length ranged from 172.70 plus or minus 2.71 days in the 3rd lactation to 188.24 plus or minus 2.52 in the 2nd, and kidding interval from 334.12 plus or minus 10.91 days (4th) to 381.64 plus or minus 3.14 (1st). The phenotypic and genetic variances and covariances are tabulated for the above traits and for lifetime milk production. 11 selection indices were calculated for different combinations of age at 1st kidding, 1st- lactation milk yield, length of the 1st lactation, and 1st kidding interval, separately for each of 4 measures of lifetime milk production. The efficiency of the indices, as indicated by the correlation between the index and lifetime production, was highest (0.508-0.693) for the indices which included all 4 traits. If selection were to be based on only 1 trait, 1st-lactation milk yield would give a higher correlated response in lifetime production than selection for any other trait. |
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Palavras-Chave: |
Lifetime production; Selection. |
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Thesagro: |
Caprino; Eficiência reprodutiva; Genética animal; Leite; Produção; Seleção. |
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Thesaurus Nal: |
Goats; Reproductive performance. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02025naa a2200253 a 4500
001 2066620
005 2017-03-09
008 1980 bl uuuu u00u1 u #d
100 1 $aSINGH, R. N.
245 $aBeetal goat$bgenetic selection for maximizing lifetime milk production.
260 $c1980
520 $aAbstract: Data were analysed on the performance of 1439 goats in 3829 lactations recorded in 1931-67. Least-squares means are tabulated for age at 1st kidding, milk yield and lactation length (first 5 lactations), and kidding interval. Age at 1st kidding averaged 776.09 plus or minus 5.26 days. Milk yield ranged from 130.08 plus or minus 0.79 kg in the 1st lactation to 211.74 plus or minus 2.60 kg in the 3rd. Lactation length ranged from 172.70 plus or minus 2.71 days in the 3rd lactation to 188.24 plus or minus 2.52 in the 2nd, and kidding interval from 334.12 plus or minus 10.91 days (4th) to 381.64 plus or minus 3.14 (1st). The phenotypic and genetic variances and covariances are tabulated for the above traits and for lifetime milk production. 11 selection indices were calculated for different combinations of age at 1st kidding, 1st- lactation milk yield, length of the 1st lactation, and 1st kidding interval, separately for each of 4 measures of lifetime milk production. The efficiency of the indices, as indicated by the correlation between the index and lifetime production, was highest (0.508-0.693) for the indices which included all 4 traits. If selection were to be based on only 1 trait, 1st-lactation milk yield would give a higher correlated response in lifetime production than selection for any other trait.
650 $aGoats
650 $aReproductive performance
650 $aCaprino
650 $aEficiência reprodutiva
650 $aGenética animal
650 $aLeite
650 $aProdução
650 $aSeleção
653 $aLifetime production
653 $aSelection
700 1 $aACHARYA, R. M.
773 $tInternational Goat and Sheep Research$gv. 1 n. 3, p. 226-233, 1980.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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