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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
15/05/2023 |
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Autoria: |
TURNER, H. N.; HAYMAN, R. H.; TRIFFITT, L. K.; PRUNSTER, R. W. |
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Título: |
Response to selection for multiple births in the Australian Merino: a progress report. |
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Ano de publicação: |
1962 |
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Fonte/Imprenta: |
Animal Production, v. 4, n. 1, p. 165-176, Feb. 1962. |
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DOI: |
https://doi.org/10.1017/S0003356100034486 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Results of two-way selection for multiple births are reported, in a flock of Australian Merinos. Base ewes, selected for having multiple or single births at each of two lambings at 5 and 6 years of age have shown a good repeatability, the T group (multiple-bearers) having averaged 31 more lambs per 100 ewes mated than the O group (single-bearers) for 6 subsequent lambings. Unselected daughters of the base ewes, now ranging in age from 2 to 6 years, have also shown a difference in lamb drop, those in the T group averaging 21 more per 100 ewes mated. The difference in lamb drop has increased with the age of the daughter ewes, reaching 31 lambs per 100 ewes mated at 6 years of age. A small group of Merino ewes from a property where selection for multiple births is practised has produced 1·60 lambs per ewe mated at 2 and 3 years of age. It is suggested that earlier low estimates of heritability for the incidence of multiple births have led to unwarranted pessimism, and that in some circumstances selection for multiple births may be successful. |
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Palavras-Chave: |
Selection. |
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Thesagro: |
Melhoramento genético animal; Ovino; Seleção. |
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Thesaurus Nal: |
Genetic improvement; Sheep. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
LEADER 01787naa a2200241 a 4500
001 1521988
005 2023-05-15
008 1962 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1017/S0003356100034486$2DOI
100 1 $aTURNER, H. N.
245 $aResponse to selection for multiple births in the Australian Merino$ba progress report.$h[electronic resource]
260 $c1962
520 $aAbstract: Results of two-way selection for multiple births are reported, in a flock of Australian Merinos. Base ewes, selected for having multiple or single births at each of two lambings at 5 and 6 years of age have shown a good repeatability, the T group (multiple-bearers) having averaged 31 more lambs per 100 ewes mated than the O group (single-bearers) for 6 subsequent lambings. Unselected daughters of the base ewes, now ranging in age from 2 to 6 years, have also shown a difference in lamb drop, those in the T group averaging 21 more per 100 ewes mated. The difference in lamb drop has increased with the age of the daughter ewes, reaching 31 lambs per 100 ewes mated at 6 years of age. A small group of Merino ewes from a property where selection for multiple births is practised has produced 1·60 lambs per ewe mated at 2 and 3 years of age. It is suggested that earlier low estimates of heritability for the incidence of multiple births have led to unwarranted pessimism, and that in some circumstances selection for multiple births may be successful.
650 $aGenetic improvement
650 $aSheep
650 $aMelhoramento genético animal
650 $aOvino
650 $aSeleção
653 $aSelection
700 1 $aHAYMAN, R. H.
700 1 $aTRIFFITT, L. K.
700 1 $aPRUNSTER, R. W.
773 $tAnimal Production$gv. 4, n. 1, p. 165-176, Feb. 1962.
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| 1. |  | BEZERRA, W. A. M.; SALMAN, A. K. D.; CRUZ, P. G. da; ALVES, F. D.; SOUZA, E. C. de. Avaliação do conforto térmico de Novilhas Girolando sob dois sistemas de produção: Integração Lavoura-Pecuária e Lavoura-Pecuária-Floresta. In: ENCONTRO DE INICIAÇÃO À PESQUISA DA EMBRAPA RONDÔNIA, 15., Porto Velho. Anais [...]. Porto Velho, RO: Embrapa Rondônia, 2025. p. 17-19. (Embrapa Rondônia. Eventos Técnicos, 03).| Tipo: Artigo em Anais de Congresso |
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