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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
18/03/1998 |
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Data da última atualização: |
12/04/2022 |
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Autoria: |
SPEEDY, A. W.; OWEN, J. B. |
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Título: |
Factors affecting the cessation of oestrous activity in ewes. |
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Ano de publicação: |
1975 |
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Fonte/Imprenta: |
Animal Production, v. 21, n. 3, p. 251-255, 1975. |
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DOI: |
10.1017/s0003356100030713 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: In the first experiment, 10 ewes (¼ Finnish Landrace: ¾ Clun Forest) were maintained under natural daylength conditions and 10 were exposed to a constant daylength of 8 hr from 22 December until 1 June. No difference was demonstrated between treatments in dates of cessation of oestrous activity. It was concluded that oestrous activity will eventually cease, whether or not daylength increases after the shortest day. In the second experiment, 40 similar ewes were mated at first oestrus of the natural breeding season (mean 7 September) and lambed in January. Twenty ewes suckled lambs and 20 had lambs removed within 24 hr of birth. No sucked ewes showed oestrus before the end of the breeding season, but 9 non-sucked ewes showed oestrus at a mean interval of 37·5 days after lambing and 4 of these subsequently lambed. Suckling appeared to inhibit oestrous activity and conception in ewes at this time of year. |
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Palavras-Chave: |
Comportamento reprodutivo; Oestrous cycle. |
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Thesagro: |
Fisiologia; Ovino; Reprodução. |
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Thesaurus Nal: |
Animal reproduction; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 01546naa a2200229 a 4500
001 1518332
005 2022-04-12
008 1975 bl uuuu u00u1 u #d
024 7 $a10.1017/s0003356100030713$2DOI
100 1 $aSPEEDY, A. W.
245 $aFactors affecting the cessation of oestrous activity in ewes.
260 $c1975
520 $aAbstract: In the first experiment, 10 ewes (¼ Finnish Landrace: ¾ Clun Forest) were maintained under natural daylength conditions and 10 were exposed to a constant daylength of 8 hr from 22 December until 1 June. No difference was demonstrated between treatments in dates of cessation of oestrous activity. It was concluded that oestrous activity will eventually cease, whether or not daylength increases after the shortest day. In the second experiment, 40 similar ewes were mated at first oestrus of the natural breeding season (mean 7 September) and lambed in January. Twenty ewes suckled lambs and 20 had lambs removed within 24 hr of birth. No sucked ewes showed oestrus before the end of the breeding season, but 9 non-sucked ewes showed oestrus at a mean interval of 37·5 days after lambing and 4 of these subsequently lambed. Suckling appeared to inhibit oestrous activity and conception in ewes at this time of year.
650 $aAnimal reproduction
650 $aSheep
650 $aFisiologia
650 $aOvino
650 $aReprodução
653 $aComportamento reprodutivo
653 $aOestrous cycle
700 1 $aOWEN, J. B.
773 $tAnimal Production$gv. 21, n. 3, p. 251-255, 1975.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
