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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
12/11/2002 |
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Data da última atualização: |
12/11/2002 |
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Autoria: |
MAXFIELD, E. K.; SINCLAIR, K. D.; DUNNE, L. D.; BROADBENT, P. J.; ROBINSON, J. J.; STEWART, E.; KYLE, D. G.; MALTIN, C. A. |
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Título: |
Temporary exposure of ovine embryos to an advanced uterine environment does not affect fetal weight but alters fetal muscle development. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Biology of Reproduction, v. 59, n. 2, p. 321-325, 1998. |
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Idioma: |
Inglês |
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Conteúdo: |
Embryo transfer techniques mar result in fetuses that are heavier at birth and that have been described as highly muscled. The aim of this study was to investigate myogenesis in lambs derived from embryo transfer. Embryos were transferred at Day 3 (estrus = Day O) to a 3 days-advanced uterine environment, maintained there for 3 days, recovered, and then returned to a synchronous (Day 6) uterus these fetuses comprised the asynchronous group. Control animals were created by synchronous embryo recovery and single transfer at Day 3. Asynchronous transfer did not affect fetal weight or curved crown-rump length between 46 and 135 days of gestation. No differences were detected between groups at Days 110-135 with respect to muscle mass or protein, RNA, and DNA content. However total muscle fiber number was significantly increased in plantaris muscles from the asynchronous groups at Day 110 and Day 125, suggestive of prolonged hyperplasia. In addition, the levels of Myf 5 protein and the secondary-to-primary fiber ratio were altered in plantaris muscle from lhe asynchronous group.
The growth data are in contrast to previously reported findings. The results show that fetal myogenesis can be altered by very early events in embryogenesis and suggest that any inferences made solely on the basis of fetal or muscle weight mar be fallacious.
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Palavras-Chave: |
Desenvolvimento fetal. |
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Thesagro: |
Ovino; Reprodução Animal; Transferência de Embrião; Útero. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02140naa a2200265 a 4500
001 1528859
005 2002-11-12
008 1998 bl uuuu u00u1 u #d
100 1 $aMAXFIELD, E. K.
245 $aTemporary exposure of ovine embryos to an advanced uterine environment does not affect fetal weight but alters fetal muscle development.
260 $c1998
520 $aEmbryo transfer techniques mar result in fetuses that are heavier at birth and that have been described as highly muscled. The aim of this study was to investigate myogenesis in lambs derived from embryo transfer. Embryos were transferred at Day 3 (estrus = Day O) to a 3 days-advanced uterine environment, maintained there for 3 days, recovered, and then returned to a synchronous (Day 6) uterus these fetuses comprised the asynchronous group. Control animals were created by synchronous embryo recovery and single transfer at Day 3. Asynchronous transfer did not affect fetal weight or curved crown-rump length between 46 and 135 days of gestation. No differences were detected between groups at Days 110-135 with respect to muscle mass or protein, RNA, and DNA content. However total muscle fiber number was significantly increased in plantaris muscles from the asynchronous groups at Day 110 and Day 125, suggestive of prolonged hyperplasia. In addition, the levels of Myf 5 protein and the secondary-to-primary fiber ratio were altered in plantaris muscle from lhe asynchronous group. The growth data are in contrast to previously reported findings. The results show that fetal myogenesis can be altered by very early events in embryogenesis and suggest that any inferences made solely on the basis of fetal or muscle weight mar be fallacious.
650 $aOvino
650 $aReprodução Animal
650 $aTransferência de Embrião
650 $aÚtero
653 $aDesenvolvimento fetal
700 1 $aSINCLAIR, K. D.
700 1 $aDUNNE, L. D.
700 1 $aBROADBENT, P. J.
700 1 $aROBINSON, J. J.
700 1 $aSTEWART, E.
700 1 $aKYLE, D. G.
700 1 $aMALTIN, C. A.
773 $tBiology of Reproduction$gv. 59, n. 2, p. 321-325, 1998.
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Embrapa Caprinos e Ovinos (CNPC) |
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| 1. |  | SILVA, F. C. da; MURAOKA, T.; CASTRO, P. R. de C. e; TAVARES, S.; TRIVELIN, P. C. O.; BROSSI, M. J. de L.; PACKER, J. V. D.; SANTOS, M. B. dos. Avaliação da adubação com nitrogênio e potássio em soqueiras de cana-de-açúcar sem queima. Campinas: Embrapa Informática Agropecuária, 2007. 32 p. (Embrapa Informática Agropecuária. Boletim de pesquisa e desenvolvimento, 16).| Biblioteca(s): Embrapa Agricultura Digital. |
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