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| 1. |  | OLIVEIRA, K. V. de; RUVIARO, C. F.; LAMPERT, V. do N. Carbon footprint in different beef production systems in the Pampa biome. In: INTERNATIONAL SYMPOSIUM ON GREENHOUSE GASES IN AGRICULTURE, 2., 2016, Campo Grande, MS. Proceedings... Brasília, DF: Embrapa, 2016. p. 370-374. (Embrapa Gado de Corte. Documentos, 216). Coordenador: Roberto Giolo de Almeida. II SIGEE.| Biblioteca(s): Embrapa Pecuária Sul. |
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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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Embrapa Gado de Corte (CNPGC) |
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