Sheep reproduction Flashcards

1
Q

What is the link between melatonin and cyclicity in sheep?

A
  • Sheep = short day breeders -when melatonin increases in Autumn when the days get shorter
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2
Q

how often do ewes ovulate when cycling?

A

*Every 16-18days

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3
Q

How can reproduction be modified in sheep?

A
  • Genetics
  • Ram effect
  • Day length
  • Nutrition - flushing
  • Melatonin
  • Pharmacologically
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4
Q

What can be used to synchronize ewes?

A

*Chronogest in sponges (progesterone)
*CIDR
*Prostaglandin - luteolysis + induce cycling

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5
Q

What can be used to induce a lambing?

A
  • 8ml dexamethasone injection - from day 140 after ram has been
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6
Q

What is optimal BCS for ewes before mating?

A
  • 3-3.5
  • 2.5-3 in hill ewes
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7
Q

What should you feed an ewe during gestation?

A
  • Conception to 42 days = feed ewe maintenance only
  • Days 42-90 = feed ewe maintenance + 2MJ/day
  • Day 90-parturition = good nutrition essential (separate singles, twins, trips)
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8
Q

What should you check in a pre-breeding ram examination?

A
  • Physical exam - feet, brisket, caseous lymphadenitis
  • Scrotal measurement + palpation
  • Exteriorize + examine penis + vermiform appendage
  • semen evaluation
  • Libido testing
  • Mating dexterity
  • Serving capacity test
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9
Q

What bacteria can cause epididymitis in UK rams?

A
  • Actinobacillus seminis
  • Haemophilus somnus
  • Histophilus ovis
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10
Q

What is scrotal mange, how is it identified + treated?

A
  • Chorioptes bovis
  • Identify by skin scrapings
  • Tx = doramectin or DIazinon dip
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