Data/hora: 10/06/2024 17:25:22

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 11/10/1996
Data da última atualização: | 30/04/2009
Autoria: | WALKER, S. K.; HILL, J. L.; KLEEMANN, D. O.; NANCARROW, C. D.
Título: | Development of ovine embryos in synthetic oviductal fluid containing amino acids at oviductal fluid concentration.
Ano de publicação: | 1996
Fonte/Imprenta: | Biology of Reproduction, v.55, n.3, p.703-708, 1996.
Idioma: | Inglês
Conteúdo: | The effects of supplementing synthetic oviductal fluid (SOF) with amino acids, at oviductal fluid concentrations, on the development of ovine in vitro-matured/in vitro-fertilized embryos was examined in three experiments. ln the first, embryo development in SOF, SOF + 2% human serum (HS), SOF + 20% HS, and SOF + BSA, with and without amino acid supplementation, was examined. Development of zygotes to the blastocyst and hatching blastocyst stages was highest in medium containing 20% HS (64.8% and 54.4%, respectively) irrespective of amino acid supplementation. However, supplementation was significantly beneficial in ail other media, with up to 42.1% of zygotes developing into hatching blastocysts. ln these media, supplementation also significantly increased the mean number of nuclei per newly formed blastocyst (up to a mean of 70.8) and reduced the time during which blastocysts formed. Experiment 2 was an examination of the effect on embryo development of three amino acid preparations (oviduct amino acid concentrations vs. Eagle's Basal Medium (BME) essential + Minimum Essential Medium (MEM) nonessential vs. MEM essential + MEM ( nonessential concentrations) and the presence or absence of t BSA. Both the amino acid and BSA treatments significantly influenced the percentage of zygotes that developed to the hatching blastocyst stage but not to the blastocyst stage. The preferred (medium contained amino acids at oviductal fluid concentrations and BSA (54.5 % hatching rate). The amino acid treatments did not significantly influence the mean number of nuclei per newly formed blastocyst, but the addition of BSA had a significant effect (70.7 +- 1.14 vs. 75.7 +- 1.13). ln experiment 3, embryo development to Day 13 was examined after culture in SOF containing amino acids at oviductal fluid concentrations. Embryos were cultured in the presence of either BSA, polyvinyl alcohol (PVA), or no additional supplement and were transferred to recipient ewes on either Day 0 (after in vitro fertilization), 3, or aJ 5. The addition of BSA or PVA had no significant effect, but ili significantly more embryos developed to Day 13 following transfer on Day 0 (60.0%) than on either Day 3 or 5 (overaIl 45.4%). It is concluded that SOF containing oviductal fluid concentra- ce lions of amino acids 1) facilitates the development of a high for percentage (57.5%) of blastocysts, 2) improves embryo morphology compared with that observed in medium containing HS, ef 3) significantly improves hatching rates compared with those obtained in SOF containing commercially available preparations of amino acids, and 4) produces embryos with relatively high levers of viability to Day 13 of pregnancy.
Palavras-Chave: | Ovideto.
Thesagro: | Embrião; Ovino; Reprodução.
Categoria do assunto: | --
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (2712-1) - ADC - AP - -- -  -  - 1996.00000 - DIS