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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
19/11/2003 |
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Data da última atualização: |
28/08/2023 |
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Autoria: |
LUCIDI, P.; BARBONI, B.; MATTIOLI, M. |
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Título: |
Ram-induced ovulation to improve artificial insemination efficiency with frozen semen in sheep. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
Theriogenology, v. 55, n. 9, p. 1797-1805, Jun. 2001. |
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DOI: |
https://doi.org/10.1016/S0093-691X(01)00522-2 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Ram effect, defined as shortening of seasonal anestrus in ewes by exposure to the ram, is now well recognized but the underlying mechanisms are still unclear. Little information also exists whether the ram is able to influence the estrus cycle and ovulation. Three experiments were conducted to investigate endocrine response, time of evolation and pregnancy rate of ewes in proestrus, exposed to the ram (treated) or an adult ewe (control). In the first experiment, ewes (n = 20) were treated with fluorgestone acetate pessaries for 12 days and were given eCG and cloprostenol one day before withdrawal of pessaries. On the day after removal of the pessaries ewes in the treated group (n = 10) were exposed to the ram and those in the control group (n = 10) were exposed to an adult ewe. Blood samples were taken for LH assay every 20 min from 2 h before to 24 h after ram exposure. In the second experiment, ewes (n = 120) were induced into proestrus and on the day after removal of the pessaries were exposed to either a ram (n = 60) or a ewe (n = 60) as described above and were laparoscoped 50, 60 or 70 h after pessary withdrawal (n = 20 at each time interval). In the third experiment ewes (n = 90) were induced and exposed to the ram (n = 45) or an adult ewe (n = 45) and inseminated via a laparoscope whit frozen-thawed semen at 50 or 60 h after pessary removal, respectively. Exposure to the ram was followed in 2 h by a marked rise in LH, equivalent to a preovulatory surge in duration and amplitude. It was also followed by concentrated ovulation within 25 to 30 h and by an increased pregnancy rate in exposed ewes (73.3 vs. 53.3%). MenosAbstract: Ram effect, defined as shortening of seasonal anestrus in ewes by exposure to the ram, is now well recognized but the underlying mechanisms are still unclear. Little information also exists whether the ram is able to influence the estrus cycle and ovulation. Three experiments were conducted to investigate endocrine response, time of evolation and pregnancy rate of ewes in proestrus, exposed to the ram (treated) or an adult ewe (control). In the first experiment, ewes (n = 20) were treated with fluorgestone acetate pessaries for 12 days and were given eCG and cloprostenol one day before withdrawal of pessaries. On the day after removal of the pessaries ewes in the treated group (n = 10) were exposed to the ram and those in the control group (n = 10) were exposed to an adult ewe. Blood samples were taken for LH assay every 20 min from 2 h before to 24 h after ram exposure. In the second experiment, ewes (n = 120) were induced into proestrus and on the day after removal of the pessaries were exposed to either a ram (n = 60) or a ewe (n = 60) as described above and were laparoscoped 50, 60 or 70 h after pessary withdrawal (n = 20 at each time interval). In the third experiment ewes (n = 90) were induced and exposed to the ram (n = 45) or an adult ewe (n = 45) and inseminated via a laparoscope whit frozen-thawed semen at 50 or 60 h after pessary removal, respectively. Exposure to the ram was followed in 2 h by a marked rise in LH, equivalent to a preovulatory surge in d... Mostrar Tudo |
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Palavras-Chave: |
Efeito macho; Hormônio luteinizante; LH; Semen preservation. |
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Thesagro: |
Endocrinologia; Inseminação Artificial; Laparoscopia; Ovino; Reprodução Animal. |
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Thesaurus Nal: |
Artificial insemination; Cloprostenol; Cryopreservation; Ovulation; Pharmacology; Reproduction; Seasons; Sexual behavior; Sheep. |
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Categoria do assunto: |
-- |
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Marc: |
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001 1530045
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008 2001 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/S0093-691X(01)00522-2$2DOI
100 1 $aLUCIDI, P.
245 $aRam-induced ovulation to improve artificial insemination efficiency with frozen semen in sheep.$h[electronic resource]
260 $c2001
520 $aAbstract: Ram effect, defined as shortening of seasonal anestrus in ewes by exposure to the ram, is now well recognized but the underlying mechanisms are still unclear. Little information also exists whether the ram is able to influence the estrus cycle and ovulation. Three experiments were conducted to investigate endocrine response, time of evolation and pregnancy rate of ewes in proestrus, exposed to the ram (treated) or an adult ewe (control). In the first experiment, ewes (n = 20) were treated with fluorgestone acetate pessaries for 12 days and were given eCG and cloprostenol one day before withdrawal of pessaries. On the day after removal of the pessaries ewes in the treated group (n = 10) were exposed to the ram and those in the control group (n = 10) were exposed to an adult ewe. Blood samples were taken for LH assay every 20 min from 2 h before to 24 h after ram exposure. In the second experiment, ewes (n = 120) were induced into proestrus and on the day after removal of the pessaries were exposed to either a ram (n = 60) or a ewe (n = 60) as described above and were laparoscoped 50, 60 or 70 h after pessary withdrawal (n = 20 at each time interval). In the third experiment ewes (n = 90) were induced and exposed to the ram (n = 45) or an adult ewe (n = 45) and inseminated via a laparoscope whit frozen-thawed semen at 50 or 60 h after pessary removal, respectively. Exposure to the ram was followed in 2 h by a marked rise in LH, equivalent to a preovulatory surge in duration and amplitude. It was also followed by concentrated ovulation within 25 to 30 h and by an increased pregnancy rate in exposed ewes (73.3 vs. 53.3%).
650 $aArtificial insemination
650 $aCloprostenol
650 $aCryopreservation
650 $aOvulation
650 $aPharmacology
650 $aReproduction
650 $aSeasons
650 $aSexual behavior
650 $aSheep
650 $aEndocrinologia
650 $aInseminação Artificial
650 $aLaparoscopia
650 $aOvino
650 $aReprodução Animal
653 $aEfeito macho
653 $aHormônio luteinizante
653 $aLH
653 $aSemen preservation
700 1 $aBARBONI, B.
700 1 $aMATTIOLI, M.
773 $tTheriogenology$gv. 55, n. 9, p. 1797-1805, Jun. 2001.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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