Lab Practical 2 Flashcards
The trophectoderm becomes the
Placenta
The inner cell mass becomes the
Fetus
Function of placenta
Protection, nutrition, respiration, hormone production
4 types of placentas
Diffuse, zonary, cotyledonary, discoid
Which species has the zonary placenta
Cat and dogs
How many layers of tissue does the zonary placenta have
5
How many layers does the cotyledonary placenta have
6
Which species has the cotyledonary placenta
Cows, sheep
Which species have the diffuse placenta
Pigs, horses
How many layers does the diffuse placenta have
6
How many layers does the discoid placenta have
3
Which species has the discoid placenta
Humans and rodents
Embryogenesis
Process of embryo forming and developing
Which stage does the morula form
16 cell stage
Where does blood cross over in diffuse placenta
Chorionic villi
Maternal side of placenta in pigs
Rugae
Fetal side of placenta in pigs
Areola
Where does blood cross over in horses
Microcoyeldans
Where does blood cross over in zonary placenta
The central girdle
Which placenta is invasive
Discoid placenta
Cotyldons are on the
Fetus side
Caruncles are on the
Maternal side
Which placenta is noninvasive
Cotyldonary placenta
Which placenta is the least efficient
Cotyledonary placenta
Which placenta is most efficient
Discoid placenta
How to determine fetal age
Rectal palpation, ultrasound, crown-rump length
How often are cows milked
2-3x/day
Why are cows milked frequently
It can increase milk yield
Where is milk produced and stored in mammary gland
Produced in alveoli, stored in gland cistern
What ligament forms a sling around the udder
Lateral suspensory ligament
What hormone inhibits milk letdown
Catecholamines
Piglets death after 100 days are
Stillborns
Pigs that die in utero between 50-100 days are
Mummies
Signs of impending parturition
Restlessness, milk present, mucus from vulva, laying on side
How long are sows in the farrowing barn
1 month
BCS scale
1-9
What temperature are sperm stored
-320 F
Critical danger zone of liquid nitrogen?
The neck
What temperature do we thaw semen
95F for 30-45 seconds
Locations to observe BCS
Tail head, back, ribs
First thing you feel for during rectal palpation
Pelvic ridge
Blood pregnancy test looks for
PSPB
