Sheep & Goat Reproduction Flashcards Preview

RUSVM Theriogenology > Sheep & Goat Reproduction > Flashcards

Flashcards in Sheep & Goat Reproduction Deck (41)
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1
Q

When does puberty usually occur in sheep and goats?

A

5-15 months (or >60% of adult body weight)

2
Q

T/F: Rams with big balls come into puberty faster than their small-balled counterparts

A

True

Bigger scrotal circumference = come into puberty faster

3
Q

T/F: Sheep and goats are both short-day breeders

A

True

4
Q

Approximately how long is the estrous cycle in sheep?

A

17 days

5
Q

Approximately how long is the estrous cycle in goat?

A

21 days

6
Q

T/F: In the sheep, production of P4 is dependent on CL

A

False

  • In the goat, production of P4 is dependent on CL*
  • There is placental production of P4 in the sheep*
7
Q

What is the length of gestation in sheep? What about goats? What about racoons?

A
  • Sheep: ~147 days
  • Goat: ~150 days
  • Racoon: ~64 days
8
Q

Reproductive manipulation in small ruminants is approached from the standpoint of where the doe is in her cycle. In the transitional period, the Buck or Ram Effect is often utilized.

What is it?

A

Take the buck away for 30 days or so & then bring him back as the day gets shorter (starting to cycle) to result in an LH surge.

This can however be hard for the owner because they have to take him off the farm & bring him back at 30 days

9
Q

How long can this stay in the sheep or goat?

A

12-14 days

10
Q

What is the dose of Melengesterol Acetate (MGA) labeled for use in sheep and goats?

A

n/a

MGA is NOT LABELED for sheep/goats

11
Q

T/F: Progestin sponges may be used for manipulation of the cycle in sheep such as synchronization of estrus

A

True

12
Q

T/F: MRP in the ovine is characterized by the presence of Interferon tau (IFN-τ)

A

True

13
Q

What type of placentation is observed in sheep and goats?

A

Cotyledonary epitheliochorial placentation

14
Q

The fetal heartbeat can be detected on ultrasound in sheep and goats at ~day ____

A

~day 25

15
Q

Placentomes can be seen on transabdominal ultrasound in sheep and goats at ~day ____

A

~day 35

16
Q

Identify these structures

A

Placentomes

17
Q

In general, post-parturition, you would like the newborn lamb to be standing within ____minutes/hours and suckling within ____ minutes/hours

A

In general, post-parturition, you would like the newborn lamb to be standing within 30 minutes and suckling within 2 hours

18
Q

What are the two most common causes of dystocia in small ruminants?

A
  • Fetal posture abnormalities
  • Multiple fetuses trying to exit at the same time
19
Q

________ occurs due to failure of the cervix to completely dilate

A

ringwomb

Relatively common in the ewe

20
Q

What’s this?

A

Head Snare

Good job.

21
Q

The estrous cycle in goats is 21 days. The estrous cycle in sheep is:

A

17 days

22
Q

T/F: As a general rule, periparturient diseases are more common in sheep than in goats

A

True

(pregnancy toxemia, vaginal/uterine prolapse, RFM, metritis, pyometra, hypocalcemia)​

23
Q

T/F: Pregnancy toxemia is typically seen in the 1st trimester of pregnancy in sheep

A

False

Seen in final trimester

24
Q

T/F: Prostaglandin is most commonly used for induction of parturition in sheep

A

False

Prostaglandin not effective for SHEEP, but may use to abort before day 60. It IS effective for goats though (15 mg PGF + 15 mg Dexamethasone)

25
Q

T/F: Tail docking can cause vaginal prolapse in ewes

A

True

26
Q

The placenta in sheep and goats should be expelled by ~____ hours

A

6 hours

  • If > 6 hours, we consider it retained
  • Treatment:
    • ​**Wait and see if expel by 12 hours if animal seems well
    • Oxytocin or PGF2a
27
Q

Treatment for milk fever or hypocalcemia in sheep and goats involves:

A

IV or oral calcium

28
Q

The condition below can be seen if __________ is ingested between days 12-14 of gestation

A

Veratrum californicum (Skunk cabbage)

Toxic agent is alkaloid cyclopamine

29
Q

What is the toxic agent of Locoweed?

A

Swainsonine

30
Q

T/F: Subterranean clover and alfafas can cause subclinical reproductive impairment in sheep

A

True!

Subterranean clover and alfafas are estrogen-producing plants

31
Q

Which of the following species has a false pregnancy termed “cloud burst”?

  • Mare
  • Sow
  • Doe
  • Cow
  • Bitch
A

Doe​

32
Q

Wow, look at this weak hairy lamb. He looks like his fetoplacental unit has been infected in the past, probably after oral transmission of some sort of pestivirus if I had to guess. I wonder what he has.

A

Border Disease Virus (BDV)

33
Q

Cache Valley Disease is transmitted by ________

A

mosquitos

34
Q

Akabane Virus are transmitted by __________

A

Culicoides and mosquitos

35
Q

__________ is the most significant cause of abortion in sheep in North America, especially in Western USA

A

Campylobacter

  • C. jejuni- sporadic abortion
  • C. fetus fetus- large outbreaks of abortion
36
Q

Campylobacter __________ causes sporadic abortion in sheep

A

Campylobacter jejuni causes sporadic abortion in sheep

37
Q

Campylobacter __________ causes a large abortion outbreak in sheep

A

Campylobacter fetus fetus causes a large abortion outbreak in sheep

38
Q

These target lesions and hepatic necrosis are associated with what bacterial infection in sheep?

A

Campylobacter

Outbreaks of Campylobacter are treated with TETRACYCLINES

39
Q

T/F: Chlamydophila abortus is most commonly seen in sheep

A

False!

  • Chlamydophila abortus* occurs in sheep too, but is most commonly seen in GOATS
  • (Sheep go to camp. Goats eat clams.)*
40
Q

You are called to a goat farm that had an outbreak of abortion. Upon examination of a placenta of one of the does, you see lesions suggestive of a necrotizing placentitis on the cotyledonary and intercotyledonary areas. You take a look at the feed and see nice good quality hay. What is the most likely zoonotic causative agent?

A

Chlamydophila abortus

Q fever (Coxiella burnetti) also causes necrotizing placentitis, but is more commonly subclinical

41
Q

What zoonotic agent in sheep and goats causes placentitis of only the cotyledons (cotyledons will look white to yellow with small areas of focal necrosis) that looks kind of like a nasty pepperoni pizza?

A

Toxoplasma gondii