8- Conception failure and embryonic resorption

Question 1

What is conception failure

Answer 1

No fertilisation occurs

Question 2

List some reasons for conception failure

Answer 2

Mis-timing of mating
Ovulation failure
Male infertility

Question 3

What is embryonic death

Answer 3

loss before organogenesis is complete

Question 4

List some reasons for embryonic death

Answer 4

Chromosomal abnormalities
losses in oviduct
aberrant embryonic development
failure to be recognised by mother
implantation occurs but pregnancy lost

Question 5

Significance of embryonic death in cows

Answer 5

significant cause of infertility
pregancy losses up to 40%
more common in dairy cows
associated with high yeild and NEB

Question 6

How does nutrition lead to early pregancy failure in cows

Answer 6

NEB leads to low IGF1
high NEFA- toxic to oocyte

Question 7

What is the maternal recognition signal in cows

Answer 7

IFT

Question 8

Which infectious diseases can cause embryonic death in sheep

Answer 8

toxoplasmosis
schmallenberg
borders disease

Question 9

Which infectious diseases can cause embryonic death in pigs

Answer 9

porcine parvovirus

Question 10

T/F mares get ovarian cysts

Answer 10

False- they don’t get cysts they instead get haemorrhagic anvulatory follicles