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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: |
12/06/2025 |
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Autoria: |
FOGARTY, N. M.; MCGUIRK, B. J.; NICHOLLS, P. J. |
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Título: |
Reproductive performance of Border Leicester ewes. |
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Ano de publicação: |
1976 |
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Fonte/Imprenta: |
Proceedings Australian Society Animal Production, v. 11, p. 17-20, 1976. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: The reproductive performance and mortality of 624 Border Leicester ewes from 1963 to 1974 at Cowra Agricultural Research Station is reported. Although 49% of lambing ewes produced twins or triplets, 44% of the ewes failed to lamb. Age of ewe effects were significant for litter size and lambs born per ewe joined (LBJ). Ewe mortality was higher among older ewes. For LBJ the intraclass correlation estimate of repeatability was OJ3 with a pooled regression estimate of 0.12. Ewes failing to lamb. produced 0.22 fewer lambs at their following lambing than ewes initially producing one lamb. However there was no -additional advantage in subsequent performance for ewes initially producing twin lambs. Extreme culling of dry maiden ewes in such a flock of six age groups was estimated to raise LBJ from 78,8% to only 82.7%. |
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Palavras-Chave: |
Comportamento reprodutivo; Manejo reprodutivo; Regression coefficient. |
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Thesagro: |
Ovino; Reprodução. |
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Thesaurus Nal: |
Australia; Ewes; Mortality; Reproduction; Reproductive performance; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 01596naa a2200277 a 4500
001 1522051
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008 1976 bl uuuu u00u1 u #d
100 1 $aFOGARTY, N. M.
245 $aReproductive performance of Border Leicester ewes.$h[electronic resource]
260 $c1976
520 $aAbstract: The reproductive performance and mortality of 624 Border Leicester ewes from 1963 to 1974 at Cowra Agricultural Research Station is reported. Although 49% of lambing ewes produced twins or triplets, 44% of the ewes failed to lamb. Age of ewe effects were significant for litter size and lambs born per ewe joined (LBJ). Ewe mortality was higher among older ewes. For LBJ the intraclass correlation estimate of repeatability was OJ3 with a pooled regression estimate of 0.12. Ewes failing to lamb. produced 0.22 fewer lambs at their following lambing than ewes initially producing one lamb. However there was no -additional advantage in subsequent performance for ewes initially producing twin lambs. Extreme culling of dry maiden ewes in such a flock of six age groups was estimated to raise LBJ from 78,8% to only 82.7%.
650 $aAustralia
650 $aEwes
650 $aMortality
650 $aReproduction
650 $aReproductive performance
650 $aSheep
650 $aOvino
650 $aReprodução
653 $aComportamento reprodutivo
653 $aManejo reprodutivo
653 $aRegression coefficient
700 1 $aMCGUIRK, B. J.
700 1 $aNICHOLLS, P. J.
773 $tProceedings Australian Society Animal Production$gv. 11, p. 17-20, 1976.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
