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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: |
13/06/2023 |
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Autoria: |
CLARKE, J. N. |
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Título: |
Current levels of performance in the Ruakura fertility flock of Romney sheep. |
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Ano de publicação: |
1972 |
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Fonte/Imprenta: |
Proceedings of the New Zealand Society of Animal Production, v. 32, p. 99-111, 1972. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Data are presented for a flock of mixed-age Romney sheep established in 1948 as a long-term two-way selection experiment comprising animals selected for a high incidence of multiple births (H line), a low incidence of multiple births (L line) and a control (C line). The average reproductive performance of 2 to 4 year old ewes in the H line has shown a gradual but erratic increase relsative to the C line at an average annual rate of round 13/4 !ambs born and 11/2 lambs docked per 100 ewes mated. By contrast, there has been little consistent change in overall reproductive performance in the L line relative to the C line. Over the period 1967-70, respect.ive reproductive performance averaged for 2- to 4-year-old-ewes in the H, C and L lines was: 0.93, 0.89 and 0.84 for the ratio of ewes lambing per ewe present at lambing; 1.62, 1.22 and 1.13 for the ratio of lambs born per ewe lambing (litter size); and 0.78, 0.78 and 0.88 for the ratio of lambs docked per lamb born. Thus, relative to the C line, litter size made the greatest contribution ,to the superior overall reproductive performance of the H line, while for the L line, improved lamb survival was compensated for by a small increase in barrenness and a small decrease in litter size. Data on the growth and wool production of ewe hoggets born over the period 1965-8 are indicative of a small positive correlated response in liveweight at 14 to 16 months of age and a small negative correlated response in lamb and hogget wool production. MenosAbstract: Data are presented for a flock of mixed-age Romney sheep established in 1948 as a long-term two-way selection experiment comprising animals selected for a high incidence of multiple births (H line), a low incidence of multiple births (L line) and a control (C line). The average reproductive performance of 2 to 4 year old ewes in the H line has shown a gradual but erratic increase relsative to the C line at an average annual rate of round 13/4 !ambs born and 11/2 lambs docked per 100 ewes mated. By contrast, there has been little consistent change in overall reproductive performance in the L line relative to the C line. Over the period 1967-70, respect.ive reproductive performance averaged for 2- to 4-year-old-ewes in the H, C and L lines was: 0.93, 0.89 and 0.84 for the ratio of ewes lambing per ewe present at lambing; 1.62, 1.22 and 1.13 for the ratio of lambs born per ewe lambing (litter size); and 0.78, 0.78 and 0.88 for the ratio of lambs docked per lamb born. Thus, relative to the C line, litter size made the greatest contribution ,to the superior overall reproductive performance of the H line, while for the L line, improved lamb survival was compensated for by a small increase in barrenness and a small decrease in litter size. Data on the growth and wool production of ewe hoggets born over the period 1965-8 are indicative of a small positive correlated response in liveweight at 14 to 16 months of age and a small negative correlated response in lamb and hogget... Mostrar Tudo |
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Palavras-Chave: |
Desperdício animal; Escore corporal; Peso corporal; Peso vivo. |
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Thesagro: |
Crescimento; Genética Animal; Manejo; Melhoramento; Ovino; Raça; Reprodução. |
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Thesaurus Nal: |
Genetic improvement; Multiple births; Reproduction; Sheep. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
LEADER 02353naa a2200301 a 4500
001 1520545
005 2023-06-13
008 1972 bl uuuu u00u1 u #d
100 1 $aCLARKE, J. N.
245 $aCurrent levels of performance in the Ruakura fertility flock of Romney sheep.$h[electronic resource]
260 $c1972
520 $aAbstract: Data are presented for a flock of mixed-age Romney sheep established in 1948 as a long-term two-way selection experiment comprising animals selected for a high incidence of multiple births (H line), a low incidence of multiple births (L line) and a control (C line). The average reproductive performance of 2 to 4 year old ewes in the H line has shown a gradual but erratic increase relsative to the C line at an average annual rate of round 13/4 !ambs born and 11/2 lambs docked per 100 ewes mated. By contrast, there has been little consistent change in overall reproductive performance in the L line relative to the C line. Over the period 1967-70, respect.ive reproductive performance averaged for 2- to 4-year-old-ewes in the H, C and L lines was: 0.93, 0.89 and 0.84 for the ratio of ewes lambing per ewe present at lambing; 1.62, 1.22 and 1.13 for the ratio of lambs born per ewe lambing (litter size); and 0.78, 0.78 and 0.88 for the ratio of lambs docked per lamb born. Thus, relative to the C line, litter size made the greatest contribution ,to the superior overall reproductive performance of the H line, while for the L line, improved lamb survival was compensated for by a small increase in barrenness and a small decrease in litter size. Data on the growth and wool production of ewe hoggets born over the period 1965-8 are indicative of a small positive correlated response in liveweight at 14 to 16 months of age and a small negative correlated response in lamb and hogget wool production.
650 $aGenetic improvement
650 $aMultiple births
650 $aReproduction
650 $aSheep
650 $aCrescimento
650 $aGenética Animal
650 $aManejo
650 $aMelhoramento
650 $aOvino
650 $aRaça
650 $aReprodução
653 $aDesperdício animal
653 $aEscore corporal
653 $aPeso corporal
653 $aPeso vivo
773 $tProceedings of the New Zealand Society of Animal Production$gv. 32, p. 99-111, 1972.
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