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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
23/03/2005 |
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Data da última atualização: |
04/11/2011 |
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Autoria: |
BARI, F.; KHALID, M.; HARESING, W.; MURRAY, A.; MERRELL, B. |
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Título: |
Effect of mating system, flushing procedure, progesterone dose and donor ewe age on the yield and quality of embryos within a moet program in sheep. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
Theriogenology, v. 53, n. 3, p. 727-742, 2000. |
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Idioma: |
Inglês |
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Conteúdo: |
Multiple ovuIation and embryo transfer (MOET) has the potential to increase the rates of genetic improvement in sheep. However, better realization of this potential requires a higher yield of transferable embryos. This we investigated some factors that may contribute to high embryo yield and quality under field conditions, as part of an ongoing MOET program. Comparison of the effects of 2 breeding systems (natural service plus laparoscopic intrauterine AI vs natural service only) on embryo yield and quality indicated that while AI did not affect embryo recovery, it significantly (P<0.05) improved fertilization rate and embryo quality, and increased (P<0.05) embryo survival rate after transfer to recipients. Two flushing procedures (the original semi-Iaparoscopic and a modified version) were compared for effects on embryo recovery. The modifications made to the original collection method increased (P<0.001) embryo recovery from 69.0 + 2.4 to 83.2 + 0.6%. The effects of the progestagen priming dosage during superovuIatory treatment and ewe age on MOET outcome were also investigated. Donor ewes primed with 30-mg progestagen sponges came fito estrus 1.9 h earlier (P<0.05) than those primed with 45-mg sponges, but there was no difference in ovuIation rate or embryo recovery, or in embryo survival afier transfer between the 2 regimens. However, Chisquare analysis indicated a significant benefit in favor of the higher progesterone dose on both ferti1ization (P<0.01) and embryo quality (P<0.001). Age of donor ewe did not significantly affect the timing of estrus, fertilization rate or embryo survival afier transfer. While adult ewes had higher (P<0.05) ovulation rates and embryo yields, shearling ewes produced a much higher proportion of Grade 1 embryos (P<0.05). MenosMultiple ovuIation and embryo transfer (MOET) has the potential to increase the rates of genetic improvement in sheep. However, better realization of this potential requires a higher yield of transferable embryos. This we investigated some factors that may contribute to high embryo yield and quality under field conditions, as part of an ongoing MOET program. Comparison of the effects of 2 breeding systems (natural service plus laparoscopic intrauterine AI vs natural service only) on embryo yield and quality indicated that while AI did not affect embryo recovery, it significantly (P<0.05) improved fertilization rate and embryo quality, and increased (P<0.05) embryo survival rate after transfer to recipients. Two flushing procedures (the original semi-Iaparoscopic and a modified version) were compared for effects on embryo recovery. The modifications made to the original collection method increased (P<0.001) embryo recovery from 69.0 + 2.4 to 83.2 + 0.6%. The effects of the progestagen priming dosage during superovuIatory treatment and ewe age on MOET outcome were also investigated. Donor ewes primed with 30-mg progestagen sponges came fito estrus 1.9 h earlier (P<0.05) than those primed with 45-mg sponges, but there was no difference in ovuIation rate or embryo recovery, or in embryo survival afier transfer between the 2 regimens. However, Chisquare analysis indicated a significant benefit in favor of the higher progesterone dose on both ferti1ization (P<0.01) and embryo qual... Mostrar Tudo |
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Palavras-Chave: |
Sistema de acasalamento. |
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Thesagro: |
Comportamento Sexual; Ovino; Reprodução Animal; Transferência de Embrião. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02503naa a2200229 a 4500
001 1530997
005 2011-11-04
008 2000 bl uuuu u00u1 u #d
100 1 $aBARI, F.
245 $aEffect of mating system, flushing procedure, progesterone dose and donor ewe age on the yield and quality of embryos within a moet program in sheep.
260 $c2000
520 $aMultiple ovuIation and embryo transfer (MOET) has the potential to increase the rates of genetic improvement in sheep. However, better realization of this potential requires a higher yield of transferable embryos. This we investigated some factors that may contribute to high embryo yield and quality under field conditions, as part of an ongoing MOET program. Comparison of the effects of 2 breeding systems (natural service plus laparoscopic intrauterine AI vs natural service only) on embryo yield and quality indicated that while AI did not affect embryo recovery, it significantly (P<0.05) improved fertilization rate and embryo quality, and increased (P<0.05) embryo survival rate after transfer to recipients. Two flushing procedures (the original semi-Iaparoscopic and a modified version) were compared for effects on embryo recovery. The modifications made to the original collection method increased (P<0.001) embryo recovery from 69.0 + 2.4 to 83.2 + 0.6%. The effects of the progestagen priming dosage during superovuIatory treatment and ewe age on MOET outcome were also investigated. Donor ewes primed with 30-mg progestagen sponges came fito estrus 1.9 h earlier (P<0.05) than those primed with 45-mg sponges, but there was no difference in ovuIation rate or embryo recovery, or in embryo survival afier transfer between the 2 regimens. However, Chisquare analysis indicated a significant benefit in favor of the higher progesterone dose on both ferti1ization (P<0.01) and embryo quality (P<0.001). Age of donor ewe did not significantly affect the timing of estrus, fertilization rate or embryo survival afier transfer. While adult ewes had higher (P<0.05) ovulation rates and embryo yields, shearling ewes produced a much higher proportion of Grade 1 embryos (P<0.05).
650 $aComportamento Sexual
650 $aOvino
650 $aReprodução Animal
650 $aTransferência de Embrião
653 $aSistema de acasalamento
700 1 $aKHALID, M.
700 1 $aHARESING, W.
700 1 $aMURRAY, A.
700 1 $aMERRELL, B.
773 $tTheriogenology$gv. 53, n. 3, p. 727-742, 2000.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pantanal. Para informações adicionais entre em contato com cpap.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
01/02/2016 |
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Data da última atualização: |
15/03/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
ANTUNES, P.; SANTOS, L. G. R. O.; SANTOS, T. M. R. dos; MENEZES, F. S. de; TOMAS, W. M.; FORESTER, J. D.; FERNANDEZ, F. A. S. |
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Afiliação: |
PÂMELA ANTUNES, Universidade Federal do Rio de Janeiro; LUIZ GUSTAVO RODRIGUES OLIVEIRA SANTOS, Universidade Federal de Mato Grosso do Sul; THIAGO MATEUS ROCHA DOS SANTOS, Universidade Federal de Mato Grosso do Sul; FERNANDO SARAIVA DE MENEZES, Universidade Federal de Mato Grosso do Sul; WALFRIDO MORAES TOMAS, CPAP; JAMES D. FORESTER, University of Minnesota; FERNANDO ANTONIO SANTOS FERNANDEZ, Universidade Federal do Rio de Janeiro. |
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Título: |
Mating system of Thrichomys fosteri in the Brazilian Pantanal: spatial patterns indicate promiscuity. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Mammalian Biology, v. 100, p. 365-375, 2020. |
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DOI: |
https://doi.org/10.1007/s42991-020-00040-y |
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Idioma: |
Inglês |
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Conteúdo: |
Animal mating systems provide key insights into the relationship between evolutionary processes and ecological factors such as the spatio-temporal fuctuation of resource abundance. Characteristics of mating systems can be inferred from the spatial distribution of conspecifcs and the arrangement of reproductive pairs. Here we used home-range size and overlap for Thrichomys fosteri in the Brazilian Pantanal to infer the mating system on this echimyid rodent. Our aims were to verify the existence of sexual dimorphism, to test whether home-range size varied with the sex and body weight of the individuals, to evaluate the degree of home-range overlap, to estimate mean population density, and to infer individuals? mating system. Twenty one individuals (15 males and six females) were radio tracked from 14 to 349 days, with the number of locations by individuals ranging from 19 to 193 locations. There was a male-biased sexual dimorphism in body weight where males were 1.36 times heavier than females. Males? home-range size increased with their body weight, while for females there was no relationship. There was extensive home-range overlap between both sexes, and no evidence of territoriality. Mean population density ranged from 0.9 to 3.03 individuals/ha. Our results indicate that multiple mates were available for both sexes, characterizing a promiscuous mating system. |
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Thesagro: |
Roedor. |
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Thesaurus NAL: |
Rodentia; Rodents; Sexual dimorphism. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02147naa a2200253 a 4500
001 2035791
005 2021-03-15
008 2020 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s42991-020-00040-y$2DOI
100 1 $aANTUNES, P.
245 $aMating system of Thrichomys fosteri in the Brazilian Pantanal$bspatial patterns indicate promiscuity.$h[electronic resource]
260 $c2020
520 $aAnimal mating systems provide key insights into the relationship between evolutionary processes and ecological factors such as the spatio-temporal fuctuation of resource abundance. Characteristics of mating systems can be inferred from the spatial distribution of conspecifcs and the arrangement of reproductive pairs. Here we used home-range size and overlap for Thrichomys fosteri in the Brazilian Pantanal to infer the mating system on this echimyid rodent. Our aims were to verify the existence of sexual dimorphism, to test whether home-range size varied with the sex and body weight of the individuals, to evaluate the degree of home-range overlap, to estimate mean population density, and to infer individuals? mating system. Twenty one individuals (15 males and six females) were radio tracked from 14 to 349 days, with the number of locations by individuals ranging from 19 to 193 locations. There was a male-biased sexual dimorphism in body weight where males were 1.36 times heavier than females. Males? home-range size increased with their body weight, while for females there was no relationship. There was extensive home-range overlap between both sexes, and no evidence of territoriality. Mean population density ranged from 0.9 to 3.03 individuals/ha. Our results indicate that multiple mates were available for both sexes, characterizing a promiscuous mating system.
650 $aRodentia
650 $aRodents
650 $aSexual dimorphism
650 $aRoedor
700 1 $aSANTOS, L. G. R. O.
700 1 $aSANTOS, T. M. R. dos
700 1 $aMENEZES, F. S. de
700 1 $aTOMAS, W. M.
700 1 $aFORESTER, J. D.
700 1 $aFERNANDEZ, F. A. S.
773 $tMammalian Biology$gv. 100, p. 365-375, 2020.
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Embrapa Pantanal (CPAP) |
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