* In vitro development rate of preimplantation rabbit embryos cultured with different levels of melatonin.
- This study aimed to investigate the effect of melatonin supplementation at different levels in culture medium on embryo development in rabbits. Embryos of 2-4 cells, 8-16 cells and morula stages were recovered from nulliparous Red Baladi rabbit does by laparotomy technique 24, 48 and 72 h post-insemination, respectively. Normal embryos from each stage were cultured to hatched blastocyst stages in either control culture medium (TCM-199 + 20% fetal bovine serum) or control supplemented with melatonin at 10(-3) M, 10(-6) M or 10(-9) M. No effect of melatonin was found on development of embryos recovered at 24 h post-insemination. The high level of melatonin at 10(-3) M adversely affected the in vitro development rates of embryos recovered at 48 h post-insemination (52 versus 86, 87 and 80% blastocyst rate; 28 versus 66, 78 and 59% hatchability rate for 10(-3) M versus 10(-9) M, 10(-6) M and control, respectively, P< 0.05). At the morula stage, melatonin at 10-3 M significantly increased the in vitro development of embryos (92% for 10(-3) M versus 76% for control, P < 0.05), while the hatchability rate of these embryos was not improved by melatonin (16-30% versus 52% for melatonin groups versus control, P < 0.05). Results show that a moderate level of melatonin (10(-6) M) may improve the development and hatchability rates of preimplantation rabbit embryos. The addition of melatonin at a 10-3 M concentration enhances the development of rabbit morulae but may negatively affect the development of earlier embryos. More studies are needed to optimize the use of melatonin in in vitro embryo culture in rabbits.
=>発達, 開発, 産物, 進展
Overview of noun development
The noun development has 9 senses (first 7 from tagged texts)
1. (52) development -- (act of improving by expanding or enlarging or refining; "he congratulated
them on their development of a plan to meet the emergency"; "they funded research and development")
2. (46) development, evolution -- (a process in which something passes by degrees to a different
stage (especially a more advanced or mature stage); "the development of his ideas took many years";
"the evolution of Greek civilization"; "the slow development of her skill as a writer")
3. (11) growth, growing, maturation, development, ontogeny, ontogenesis -- ((biology) the process of
an individual organism growing organically; a purely biological unfolding of events involved in an
organism changing gradually from a simple to a more complex level; "he proposed an indicator of
osseous development in children")
4. (9) development -- (a recent event that has some relevance for the present situation; "recent
developments in Iraq"; "what a revolting development!")
5. (7) exploitation, development -- (the act of making some area of land or water more profitable or
productive or useful; "the development of Alaskan resources"; "the exploitation of copper deposits")
6. (6) development -- (a district that has been developed to serve some purpose; "such land is
practical for small park developments")
7. (4) development -- (a state in which things are improving; the result of developing (as in the
early part of a game of chess); "after he saw the latest development he changed his mind and became
a supporter"; "in chess your should take care of your development before moving your queen")
8. development, developing -- (processing a photosensitive material in order to make an image
visible; "the development and printing of his pictures took only two hours")
9. development -- ((music) the section of a composition or movement (especially in sonata form)
where the major musical themes are developed and elaborated)
--- WordNet end ---