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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
27/07/1998 |
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Data da última atualização: |
27/07/1998 |
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Autoria: |
PINHEIRO, O. L.; BARROS, C. M.; FIGUEIREDO, R. A.; VALLE, E. R. do; ENCARNACAO, R. O.; PADOVANI, C. R. |
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Afiliação: |
UNESP. Departamento de Farmacologia (Botucatu, SP). |
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Título: |
Estrous behavior and the estrus-to-ovulation interval im Nelore cattle (Bos indicus) with natural estrus or estrus induced with prostaglandin F2a or norgestomet and estradiol valerate. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Theriogenology, New York, v.49, n.3, p.667-681, Feb. 1998. |
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Idioma: |
Inglês |
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Notas: |
CNPGC. |
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Conteúdo: |
Estrous behavior and the estrus-to-ovulation interval are essential for estimating the best time -to artificially inseminate cattle. Because these parameters are not well charactefized in the Nelore breed (Bos indicus), the main purpose of the this study was to determine the estrus-to-ovulation interval in Nelore heifers and cows vdth natural estrus or with estrus induced by treatments with PGF2a or norgestomet and estradiol valerate (NEV). The cows and heifers were observed continuously (24 h a day) to determine the onset of estrus and to study estrous behavior in the cows. Ten hours after the start of estrus the ovaries were scanned every 2 h by ultrasonography to monitor the dominant follicle until ovulation. Blood samples were collected periodically to determine progesterone levels by RIA. Administration of PGF2a (2 injections, 11 days apart) did not induce estrus in most Nelore females in spite of the presence of functional CL, indicated by progesterone concentrations above 6.0 ng/ml in 25 of 28 animals. Treatment with NEV induced high sexual receptivity in cows (10/11), but only 66% ovulated. Cows with natural or induced estrus exhibited behavioral estrus of 10.9 + - 1.4 h, and ovulation occurred 26.6 + - 0.44 h (n=26) after the onset of estrus. In most of the cows (53.8%) estrus began at night (between 1801 and 600 h), and 34.6% it started and finished during the night. It is concluded that in Nelore females ovulation occurs approximately 26 h after the onset of estrus. Additionally, estrous behavior is shorter than in European breeds, and there is a high incidence of estrus at night, which makes it difficult to detect and, consequently, impairs Al in Nelore cattle. The observation that a high percentage of Nelore females with an active CL did not respond to usual dosages of PGF2a warrants further investigation. MenosEstrous behavior and the estrus-to-ovulation interval are essential for estimating the best time -to artificially inseminate cattle. Because these parameters are not well charactefized in the Nelore breed (Bos indicus), the main purpose of the this study was to determine the estrus-to-ovulation interval in Nelore heifers and cows vdth natural estrus or with estrus induced by treatments with PGF2a or norgestomet and estradiol valerate (NEV). The cows and heifers were observed continuously (24 h a day) to determine the onset of estrus and to study estrous behavior in the cows. Ten hours after the start of estrus the ovaries were scanned every 2 h by ultrasonography to monitor the dominant follicle until ovulation. Blood samples were collected periodically to determine progesterone levels by RIA. Administration of PGF2a (2 injections, 11 days apart) did not induce estrus in most Nelore females in spite of the presence of functional CL, indicated by progesterone concentrations above 6.0 ng/ml in 25 of 28 animals. Treatment with NEV induced high sexual receptivity in cows (10/11), but only 66% ovulated. Cows with natural or induced estrus exhibited behavioral estrus of 10.9 + - 1.4 h, and ovulation occurred 26.6 + - 0.44 h (n=26) after the onset of estrus. In most of the cows (53.8%) estrus began at night (between 1801 and 600 h), and 34.6% it started and finished during the night. It is concluded that in Nelore females ovulation occurs approximately 26 h after the onset of estru... Mostrar Tudo |
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Palavras-Chave: |
Behaviour; Comportamento; Nelore; Novilha; Oestrus cycle; Prostaglandin. |
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Thesagro: |
Bovino; Ciclo Estral; Estradiol; Prostaglandina; Reprodução; Vaca. |
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Thesaurus Nal: |
cattle; cows; heifers; Nellore; norgestomet. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02945naa a2200397 a 4500
001 1320072
005 1998-07-27
008 1998 bl uuuu u00u1 u #d
100 1 $aPINHEIRO, O. L.
245 $aEstrous behavior and the estrus-to-ovulation interval im Nelore cattle (Bos indicus) with natural estrus or estrus induced with prostaglandin F2a or norgestomet and estradiol valerate.
260 $c1998
500 $aCNPGC.
520 $aEstrous behavior and the estrus-to-ovulation interval are essential for estimating the best time -to artificially inseminate cattle. Because these parameters are not well charactefized in the Nelore breed (Bos indicus), the main purpose of the this study was to determine the estrus-to-ovulation interval in Nelore heifers and cows vdth natural estrus or with estrus induced by treatments with PGF2a or norgestomet and estradiol valerate (NEV). The cows and heifers were observed continuously (24 h a day) to determine the onset of estrus and to study estrous behavior in the cows. Ten hours after the start of estrus the ovaries were scanned every 2 h by ultrasonography to monitor the dominant follicle until ovulation. Blood samples were collected periodically to determine progesterone levels by RIA. Administration of PGF2a (2 injections, 11 days apart) did not induce estrus in most Nelore females in spite of the presence of functional CL, indicated by progesterone concentrations above 6.0 ng/ml in 25 of 28 animals. Treatment with NEV induced high sexual receptivity in cows (10/11), but only 66% ovulated. Cows with natural or induced estrus exhibited behavioral estrus of 10.9 + - 1.4 h, and ovulation occurred 26.6 + - 0.44 h (n=26) after the onset of estrus. In most of the cows (53.8%) estrus began at night (between 1801 and 600 h), and 34.6% it started and finished during the night. It is concluded that in Nelore females ovulation occurs approximately 26 h after the onset of estrus. Additionally, estrous behavior is shorter than in European breeds, and there is a high incidence of estrus at night, which makes it difficult to detect and, consequently, impairs Al in Nelore cattle. The observation that a high percentage of Nelore females with an active CL did not respond to usual dosages of PGF2a warrants further investigation.
650 $acattle
650 $acows
650 $aheifers
650 $aNellore
650 $anorgestomet
650 $aBovino
650 $aCiclo Estral
650 $aEstradiol
650 $aProstaglandina
650 $aReprodução
650 $aVaca
653 $aBehaviour
653 $aComportamento
653 $aNelore
653 $aNovilha
653 $aOestrus cycle
653 $aProstaglandin
700 1 $aBARROS, C. M.
700 1 $aFIGUEIREDO, R. A.
700 1 $aVALLE, E. R. do
700 1 $aENCARNACAO, R. O.
700 1 $aPADOVANI, C. R.
773 $tTheriogenology, New York$gv.49, n.3, p.667-681, Feb. 1998.
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
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Data corrente: |
18/01/1994 |
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Data da última atualização: |
30/08/2013 |
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Tipo da produção científica: |
Circular Técnica |
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Autoria: |
MORAES, V. H. de F. |
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Afiliação: |
EMBRAPA-CPAA. |
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Título: |
Operações de pré-plantio do toco alto de seringueira. |
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Ano de publicação: |
1992 |
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Fonte/Imprenta: |
Manaus: EMBRAPA-CPAA, 1992. |
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Páginas: |
40 p. |
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Série: |
(EMBRAPA-CPAA. Circular Técnica, 5) |
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ISSN: |
0103-6890 |
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Idioma: |
Português |
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Conteúdo: |
A tecnica de parafinagem do caule do toco alto, desenvolvida pela Montebor Agricola Ltda. (Manaus, AM), garantiu, em plantio feito em 1988, uma taxa de pegamento ao redor de 95%, sem gemas brotadas e em plena estacao chuvosa. Mas, na estacao seca subsequente, ocorreram escalduras ao longo do caule, com morte de muitas plantas e atraso no crescimento das sobreviventes, evidenciando a necessidade de caiacao do caule. Essa tecnica, suscitou a expectativa de que seria possivel prescindir-se da brotacao previa das gemas do apice e, com a substituicao do corte antecipado da pivotante pela inducao de rizogenese com auxina, o plantio do toco alto seria liberado dos prazos rigidos apos as operacoes previas ao plantio. Os experimentos descritos tiveram esse objetivo e agarantia do sucesso no plantio, se houver falta de chuvas, como temas de estudo. |
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Palavras-Chave: |
Amazonas; Brasil; Budded stumps; Hevea brassiliensis; Plantation; Rubber tree; Technique; Tecnica; Toco alto. |
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Thesagro: |
Enxerto; Espécie; Hevea; Hevea Brasiliensis; Plantio; Pré-Plantio; Seringueira. |
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Thesaurus NAL: |
preplanting treatment. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/53171/1/circular-tecnica-05.pdf
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Marc: |
LEADER 01712nam a2200349 a 4500
001 1665316
005 2013-08-30
008 1992 bl uuuu u0uu1 u #d
022 $a0103-6890
100 1 $aMORAES, V. H. de F.
245 $aOperações de pré-plantio do toco alto de seringueira.
260 $aManaus: EMBRAPA-CPAA$c1992
300 $a40 p.
490 $a(EMBRAPA-CPAA. Circular Técnica, 5)
520 $aA tecnica de parafinagem do caule do toco alto, desenvolvida pela Montebor Agricola Ltda. (Manaus, AM), garantiu, em plantio feito em 1988, uma taxa de pegamento ao redor de 95%, sem gemas brotadas e em plena estacao chuvosa. Mas, na estacao seca subsequente, ocorreram escalduras ao longo do caule, com morte de muitas plantas e atraso no crescimento das sobreviventes, evidenciando a necessidade de caiacao do caule. Essa tecnica, suscitou a expectativa de que seria possivel prescindir-se da brotacao previa das gemas do apice e, com a substituicao do corte antecipado da pivotante pela inducao de rizogenese com auxina, o plantio do toco alto seria liberado dos prazos rigidos apos as operacoes previas ao plantio. Os experimentos descritos tiveram esse objetivo e agarantia do sucesso no plantio, se houver falta de chuvas, como temas de estudo.
650 $apreplanting treatment
650 $aEnxerto
650 $aEspécie
650 $aHevea
650 $aHevea Brasiliensis
650 $aPlantio
650 $aPré-Plantio
650 $aSeringueira
653 $aAmazonas
653 $aBrasil
653 $aBudded stumps
653 $aHevea brassiliensis
653 $aPlantation
653 $aRubber tree
653 $aTechnique
653 $aTecnica
653 $aToco alto
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Embrapa Amazônia Ocidental (CPAA) |
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