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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: |
10/07/2023 |
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Autoria: |
EDEY, T. N.; CHU, T. T.; KILGOUR.; SMITH, O. F.; TERVIT, H. R. |
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Título: |
Estrus without ovulation in puberal ewes. |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
Theriogenology, v. 7, n. 1, p. 11-15, Jan. 1977. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: In three groups of puberal sheep, one of young Merino ewes and one of Merino ewe lambs at Armidale, Australia, and one of Perendale ewe lambs at Hamilton, New Zealand, 20, 33 and 6.6% respectively of the animals failed to ovulate at their first estrus. Duration of estrus and intensity of overt estrous symptoms in these animals were the same as in their ovulating contemporaries. While the anovulatory estrus was followed by estrus with ovulation in most animals, many of the Merino lambs had a second anovulatory estrus and then went into anestrum. In some animals, failure of ovulation was followed by luteinization of a large follicle. In the Perendale lambs, the inter-estrous period following an anovulatory estrus was 15.9 days compared to 16.7 days in their ovulating contemporaries. The occurrence of anovulatory estrus in these three different groups of animals suggests that it is common in the first breeding season of young ewes. Lambing percentage probably is reduced below the expected level by the presence in the flock of ewe lambs that have had an estrus but not yet reached puberty. |
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Palavras-Chave: |
Estro. |
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Thesagro: |
Ovino; Ovulação; Reprodução. |
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Thesaurus Nal: |
Estrus; Ovulation; Pregnancy; Reproduction; Sexual maturity; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 01814naa a2200289 a 4500
001 1521483
005 2023-07-10
008 1977 bl uuuu u00u1 u #d
100 1 $aEDEY, T. N.
245 $aEstrus without ovulation in puberal ewes.$h[electronic resource]
260 $c1977
520 $aAbstract: In three groups of puberal sheep, one of young Merino ewes and one of Merino ewe lambs at Armidale, Australia, and one of Perendale ewe lambs at Hamilton, New Zealand, 20, 33 and 6.6% respectively of the animals failed to ovulate at their first estrus. Duration of estrus and intensity of overt estrous symptoms in these animals were the same as in their ovulating contemporaries. While the anovulatory estrus was followed by estrus with ovulation in most animals, many of the Merino lambs had a second anovulatory estrus and then went into anestrum. In some animals, failure of ovulation was followed by luteinization of a large follicle. In the Perendale lambs, the inter-estrous period following an anovulatory estrus was 15.9 days compared to 16.7 days in their ovulating contemporaries. The occurrence of anovulatory estrus in these three different groups of animals suggests that it is common in the first breeding season of young ewes. Lambing percentage probably is reduced below the expected level by the presence in the flock of ewe lambs that have had an estrus but not yet reached puberty.
650 $aEstrus
650 $aOvulation
650 $aPregnancy
650 $aReproduction
650 $aSexual maturity
650 $aSheep
650 $aOvino
650 $aOvulação
650 $aReprodução
653 $aEstro
700 1 $aCHU, T. T.
700 1 $aKILGOUR.
700 1 $aSMITH, O. F.
700 1 $aTERVIT, H. R.
773 $tTheriogenology$gv. 7, n. 1, p. 11-15, Jan. 1977.
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