Embryo Transfer Flashcards
(12 cards)
animals used in the first performed and recorded ET
2 Angora rabbit embryos
purpose to minimize cost of importing live animals for breeding
Embryo transfer
considered/performed to obtain offspring from a genetically valuable cow that has become infertile due to injury, disease or age
Embryo transfer
Estrus or heat can be expected to occur approximately _____ hours later
48-60 hrs
Embryos are classified according to the following subjective criteria:
* Grade 1: _____
* Grade 2: _____
* Grade 3: _____
* Grade 4: _____
- Grade 1: excellent or good
- Grade 2: fair
- Grade 3: poor
- Grade 4: dead or degenerating
Grade __ embryos generally are considered the only ones to freeze
Grade 1
Grade __ embryos can be frozen and thawed, yet pregnancy rates typically are reduced
Grade 2
Embryos are also evaluated for their stage of development without regard to quality:
* Stage 1: _____
* Stage 2: _____
* Stage 3: _____
* Stage 4: _____
* Stage 5: _____
* Stage 6: _____
* Stage 7: _____
* Stage 8: _____
* Stage 9: _____
- Stage 1: unfertilized
- Stage 2: 2 to 12 cell
- Stage 3: early morula
- Stage 4: morula
- Stage 5: early blastocyst
- Stage 6: blastocyst
- Stage 7: expanded blastocyst
- Stage 8: hatched blastocyst
- Stage 9: expanding hatched blatocyst
Embryos in stage _____ endure the freezing and thawing procedures with greatest viability
4, 5, 6
a biopsy of the embryo is obtained and cultured with colchicine
Karyotyping
are animals with cells of two or more different genotypes in their bodies
Chimeras
They are usually made either by mixing cells of two or more embryos just before compaction or by injecting cells of one embryo into the inside of another, generally at the blastocyst stage
Chimeras
