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Registro Completo |
Biblioteca(s): |
Embrapa Gado de Corte. |
Data corrente: |
27/07/1998 |
Data da última atualização: |
27/07/1998 |
Autoria: |
PINHEIRO, O. L.; BARROS, C. M.; FIGUEIREDO, R. A.; VALLE, E. R. do; ENCARNACAO, R. O.; PADOVANI, C. R. |
Afiliação: |
UNESP. Departamento de Farmacologia (Botucatu, SP). |
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. |
Ano de publicação: |
1998 |
Fonte/Imprenta: |
Theriogenology, New York, v.49, n.3, p.667-681, Feb. 1998. |
Idioma: |
Inglês |
Notas: |
CNPGC. |
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 |
Palavras-Chave: |
Behaviour; Comportamento; Nelore; Novilha; Oestrus cycle; Prostaglandin. |
Thesagro: |
Bovino; Ciclo Estral; Estradiol; Prostaglandina; Reprodução; Vaca. |
Thesaurus Nal: |
cattle; cows; heifers; Nellore; norgestomet. |
Categoria do assunto: |
-- |
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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Embrapa Gado de Corte (CNPGC) |
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Registro Completo
Biblioteca(s): |
Embrapa Hortaliças. |
Data corrente: |
12/12/2012 |
Data da última atualização: |
23/08/2016 |
Tipo da produção científica: |
Comunicado Técnico/Recomendações Técnicas |
Autoria: |
QUEZADO-DUVAL, A. M.; ARAÚJO, E. R. de; FERREIRA, M. A. da S. V. |
Afiliação: |
ALICE MARIA QUEZADO DUVAL, CNPH; EDIVÂNIO RODRIGUES DE ARAÚJO, UNIVERSIDADE DE BRASÍLIA; MARISA ÁLVARES DA SILVA VELLOSO FERREIRA, UNIVERSIDADE DE BRASÍLIA. |
Título: |
Detecção e identificação molecular de Xanthomonas spp. causadoras da mancha bacteriana do tomateiro. |
Ano de publicação: |
2012 |
Fonte/Imprenta: |
Brasília, DF: Embrapa, 2012. |
Páginas: |
5 p. |
Série: |
(Embrapa Hortaliças. Comunicado Técnico, 84). |
ISSN: |
1414-9850 |
Idioma: |
Português |
Conteúdo: |
Neste comunicado são relatados os procedimentos para a identificação molecular das quatro espécies de Xanthomonas associadas à mancha bacteriana do tomateiro. |
Thesagro: |
Doença de planta; Mancha bacteriana; Tomate. |
Thesaurus NAL: |
Solanum lycopersicum. |
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/72192/1/cot-841.pdf
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Marc: |
LEADER 00819nam a2200217 a 4500 001 1942350 005 2016-08-23 008 2012 bl uuuu u0uu1 u #d 022 $a1414-9850 100 1 $aQUEZADO-DUVAL, A. M. 245 $aDetecção e identificação molecular de Xanthomonas spp. causadoras da mancha bacteriana do tomateiro. 260 $aBrasília, DF: Embrapa$c2012 300 $a5 p. 490 $a(Embrapa Hortaliças. Comunicado Técnico, 84). 520 $aNeste comunicado são relatados os procedimentos para a identificação molecular das quatro espécies de Xanthomonas associadas à mancha bacteriana do tomateiro. 650 $aSolanum lycopersicum 650 $aDoença de planta 650 $aMancha bacteriana 650 $aTomate 700 1 $aARAÚJO, E. R. de 700 1 $aFERREIRA, M. A. da S. V.
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