Control of Pregnancy Flashcards

1
Q

How is pregnancy controlled?

A

Endocrine control

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2
Q

Why is the placenta important for pregnancy control?

A
  • stimulates ovarian function
  • maintains pregnancy
  • affects foetal growth
  • aids parturition
  • prepares for lactation
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3
Q

What hormones are involved in controlling a pregnancy?

A
  • progesterone
  • maternal recognition pregnancy factors
  • equine chorionic gonadotrophin
    -placental lactogen
    oestrogens
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4
Q

Why is progesterone important for controlling pregnancy?

A
  • produced by corpus luteum and placenta
  • low pregnancy rate = low progesterone
    -histotroph production
  • tightens cervix
  • suppression of ovarian activity (APART FROM MARE)
  • Behavioural changes
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5
Q

Why is maternal recognition of pregnancy important?

A
  • effect other hormones release (eg- oxytocin)
  • imperative for the survival of the corpus luteum
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6
Q

Why is the corpus luteum different in the mare?

A
  • secondary corputus lutem formed due to increased ovarian activity they can have up to 15 (day 40-60)
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7
Q

How is placental lactogen produced?

A
  • cows and sheep
  • produced from binucleate cells of the placenta
  • production of histotroph
  • modulates foetal/maternal metabolisum
    -optimises energy supply to foetus
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