Pregnancy and neonatology - equine Flashcards Preview

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Flashcards in Pregnancy and neonatology - equine Deck (128)
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1

how long is the equine preen in days

336d

2

are overdue foals a cause for concern? and why

no. variable time to conception

3

where does fertilisation occur?

ampulla

4

how long does the embryo remain in the oviduct until it enters the uterus

5-6d

5

why does the eq conceptus migrate around the uterus

to release maternal recogn of pregnancy hormone to the endometrium which prevents the release of PGs

6

when does the eq conceptus fix into position and where

d15-16 at the base of a horn

7

when does eq placental attachment begin

d36

8

what also occurs at the same time of placental attachment

production of the endometrial cups

9

what do the endometrial cups secrete

eCG

10

what is the purpose of eCG

to maintain primary CL and encourage formation of 2ry CL

11

between the prog from CL and eCG from endometrial cups, how long do they support the preg

5mths

12

how long does the maternal recog of pregnancy prevent regression of CL

14d+

13

when do the cups degenerate

d70-150

14

after d200 when all the CLs are degenerate what maintains the pregn

foetal placental progesterone

15

what is the significance of the endometrial cups wrt abortion

once in place the mare will not cycle until next year. this isn't good if you want to breed her this year - so do the scan before d35

16

what is the first sign of successful conception

failure to run to oestrous

17

how can you determine pregnancy using lab results

blood samples - eCG from d45-90; oestrogen sulphate d120+
urine - oestrogen sulphate d150+
faecal - oestrogen sulphate, not v reliable

18

describe the theory of rectal palpation (clinical skills)

lube
insert arm
empty any faeces
feel for intercornual lig the horns bend up
follow horns to softly feel ovaries
any contractions - remove arm back
assess cervix, ovaries and uterine tone

19

when can most people rectally pregnancy dx

d40

20

when can most people undertake rectal u/s

d10+ be careful though

21

what age is the first scan post-mating

d14 (and d16 to check if twins, up to here they are motile, so will have moved around each other)

22

at what age of the embryo is the heartbeat scan

d24. also another opportunity to check for twins

23

is a 3rd scan necessary?

no - death unlikely now BUT if you want - at 6wks

24

what size will the 'embryo cyst' be at d14, d16, d25

d14 - 1cm
d16 - 1.5cm
d25 - 3cm

25

if the O will only pay for 1 x scan - when should it be?

d28-35. can check alive, check for twins

26

when would transabdo scanning be implemented to look at a foetus

6mths +

27

when is early embryonic death classified from; when is abortion and when is still birth

EED = d0-40
abortion = d40-300
stillbirth = d300+ (gestation = 336, foal could not survive here, so not strictly speaking still birth - definitions change!!!)

28

what re the common causes of pregnancy failure

viral - EHV-1 and EVA, bacterial, fungal, maternal illness/stress, twins, abnormalities, umbilical torsion

29

what are the causes of EED

older mares
breeding on foal heat
congenital abn
fibrotic/inflamed uterus

30

describe the properties of EHV-1 and abortion
- when abortion seen
- transmission
- dx
- tx
- prevention

ubiquitous,
late abortion >5mth - foal may be alive, but will shortly die
transmission = resp, aborted material, vaginal d/c
n-pharyngeal swap or aborted material PCR
no tx, just separated mares from young stock
prev = vaca @ 5, 7, 9 mth of pregnancy