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breeding and reproduction > oestrus and ovulation manipulation > Flashcards

oestrus and ovulation manipulation Flashcards

1
Q

HPO axis

A

hypothalamus - GnRH
acts on
pituitary - FSH, LH
acts on
ovary - inhibin, oestradiol, progesterone, oxytocin
endometrium - PGF2a

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2
Q

oestrus detection - dairy cows

A

heat detection rate = 60%
stands to be mounted, mounts other cows, chin pressing and licking, sniffing, swelling of vulva and muscle discharge

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3
Q

oestrus detection aids

A

tail paint/ chalk
mount indicator
activity monitors

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4
Q

reasons for manipulation

A

poor oestrus detection
synchronisation
enable AI and ET
trigger post-partum resumption

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5
Q

hormone that shortens luteal phase

A

PGF2a

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6
Q

hormone that extends luteal phase

A

progesterone

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7
Q

hormone used to recruit and grow follicles

A

PMSG (gonadotrophin)

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8
Q

hormone to stimulate ovulation

A

GnRH

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9
Q

hormone that will arrest oestrus cycle

A

progesterone

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10
Q

causes of anoestrus

A

pregnancy
lactation
NEB - negative energy balance
stress
pathology
season

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breeding and reproduction (8 decks)

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