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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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Registro Completo
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
20/03/2019 |
Data da última atualização: |
13/01/2020 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
ZENNI, R. D.; SAMPAIO, A. B.; LIMA, Y. P.; PESSOA FILHO, M. A. C. de P.; LINS. T. C. L.; PIVELLO, V. R.; DAEHLER, C. |
Afiliação: |
RAFAEL DUQUETE ZENNI, UNIVERSIDADE FEDERAL DE LAVRAS; ALEXANDRE B. SAMPAIO, ICMBIO; YARA P. LIMA, UCB; MARCO AURELIO CALDAS DE PINHO PESSO, CPAC; TULIO C. L. LINS, UNIP; VANIA V. R. PIVELLO, UNB; CURTIS DAEHLER, UNIVERSITY OF HAWAI. |
Título: |
Invasive Melinis minutiflora outperforms native species, but the magnitude of the effect is context-dependent. |
Ano de publicação: |
2019 |
Fonte/Imprenta: |
Biological Invasions, v. 21, n. 2, p. 657-667, February 2019. |
DOI: |
https://doi.org/10.1007/s10530-018-1854-5 |
Idioma: |
Inglês |
Conteúdo: |
Abstract: Impacts of invasive species are context-dependent owing to genetic differences in the invasive species, in the abiotic environment or the recipient biotas. Here, we tested how these factors affected the invasive grass Melinis minutiflora and its impacts on native plants in Hawai?i (USA) and in the Brazilian Cerrado under four environmental conditions. We sampled M. minutiflora and three native species from each studied region and conducted two equivalent greenhouse experiments. In each experiment, we manipulated shade, irrigation, soil nutrients, and interspecific competition. We found that M. minutiflora had low genetic polymorphism, and two distinct genetic clusters exist. Both clusters exist in Hawai?i and Brazil. Melinis minutiflora biomass was three-times greater in Brazil compared to Hawai?i. Both in Brazil and Hawai?i, M. minutiflora was affected by shade, irrigation, and competition. While in Brazil the identity of the competing native species did not matter for M. minutiflora, in Hawai?i the identity of the native species affected M. minutiflora when shade was applied. Brazilian native species were all affected by shading, two of them by competition with M. minutiflora, and one of them by fertilization. Two Hawaiian native plants were affected by shade and competition with M. minutiflora, whereas one native species was not affected by any of the experimental factors. In summary, both biotic and abiotic factors affected native and invasive species. However, in all cases native species were outperformed by the invader. MenosAbstract: Impacts of invasive species are context-dependent owing to genetic differences in the invasive species, in the abiotic environment or the recipient biotas. Here, we tested how these factors affected the invasive grass Melinis minutiflora and its impacts on native plants in Hawai?i (USA) and in the Brazilian Cerrado under four environmental conditions. We sampled M. minutiflora and three native species from each studied region and conducted two equivalent greenhouse experiments. In each experiment, we manipulated shade, irrigation, soil nutrients, and interspecific competition. We found that M. minutiflora had low genetic polymorphism, and two distinct genetic clusters exist. Both clusters exist in Hawai?i and Brazil. Melinis minutiflora biomass was three-times greater in Brazil compared to Hawai?i. Both in Brazil and Hawai?i, M. minutiflora was affected by shade, irrigation, and competition. While in Brazil the identity of the competing native species did not matter for M. minutiflora, in Hawai?i the identity of the native species affected M. minutiflora when shade was applied. Brazilian native species were all affected by shading, two of them by competition with M. minutiflora, and one of them by fertilization. Two Hawaiian native plants were affected by shade and competition with M. minutiflora, whereas one native species was not affected by any of the experimental factors. In summary, both biotic and abiotic factors affected native and invasive species. However,... Mostrar Tudo |
Palavras-Chave: |
Brasil. |
Thesagro: |
Capim Gordura; Cerrado; Erva Daninha; Melinis Minutiflora; Planta Exótica. |
Thesaurus NAL: |
Hawaii. |
Categoria do assunto: |
G Melhoramento Genético |
Marc: |
LEADER 02432naa a2200289 a 4500 001 2107331 005 2020-01-13 008 2019 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1007/s10530-018-1854-5$2DOI 100 1 $aZENNI, R. D. 245 $aInvasive Melinis minutiflora outperforms native species, but the magnitude of the effect is context-dependent.$h[electronic resource] 260 $c2019 520 $aAbstract: Impacts of invasive species are context-dependent owing to genetic differences in the invasive species, in the abiotic environment or the recipient biotas. Here, we tested how these factors affected the invasive grass Melinis minutiflora and its impacts on native plants in Hawai?i (USA) and in the Brazilian Cerrado under four environmental conditions. We sampled M. minutiflora and three native species from each studied region and conducted two equivalent greenhouse experiments. In each experiment, we manipulated shade, irrigation, soil nutrients, and interspecific competition. We found that M. minutiflora had low genetic polymorphism, and two distinct genetic clusters exist. Both clusters exist in Hawai?i and Brazil. Melinis minutiflora biomass was three-times greater in Brazil compared to Hawai?i. Both in Brazil and Hawai?i, M. minutiflora was affected by shade, irrigation, and competition. While in Brazil the identity of the competing native species did not matter for M. minutiflora, in Hawai?i the identity of the native species affected M. minutiflora when shade was applied. Brazilian native species were all affected by shading, two of them by competition with M. minutiflora, and one of them by fertilization. Two Hawaiian native plants were affected by shade and competition with M. minutiflora, whereas one native species was not affected by any of the experimental factors. In summary, both biotic and abiotic factors affected native and invasive species. However, in all cases native species were outperformed by the invader. 650 $aHawaii 650 $aCapim Gordura 650 $aCerrado 650 $aErva Daninha 650 $aMelinis Minutiflora 650 $aPlanta Exótica 653 $aBrasil 700 1 $aSAMPAIO, A. B. 700 1 $aLIMA, Y. P. 700 1 $aPESSOA FILHO, M. A. C. de P. 700 1 $aLINS. T. C. L. 700 1 $aPIVELLO, V. R. 700 1 $aDAEHLER, C. 773 $tBiological Invasions$gv. 21, n. 2, p. 657-667, February 2019.
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