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PMM Clinical Rotations > Goat Theriogenology > Flashcards

Goat Theriogenology Flashcards

1
Q

Goats are ______ day breeders.

A

Short

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2
Q

What is the length of the estrous cycle in goats?

A

18-22 days, average of 21 days

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3
Q

What is the duration of estrus in goats?

A

24-48 hours

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4
Q

What can be seen at the beginning and ending of breeding season or post-partum in goats?

A

Increased frequency of short cycle

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5
Q

What are the signs of estrus in goats?

A
  • Swollen vulva
  • Mucoid discharge turning cloudy
  • Seeking out and stimulating male
  • Expressing immobilization reflex in response to male nudges, including serial mounting and copulations
  • Tail flagging
  • Plasma P4 < 1ng/mL
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6
Q

__________, _____________, and ____________ nutrition will all affect ovulation rate.

A

Breed, season and nutrition

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7
Q

What are ways the estrous cycle can be manipulated in goats?

A
  • Photoperiodic treatments
  • Male effect
  • Dormitory effect
  • Adapted nutrition
  • Hormonal treatments
  • Combination of above
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8
Q

Photoperiodic treatments

A
  • Begin with long days to prepare for stimulatory effects of short days or else they become photo-refractory
  • Decrease day = trigger melatonin release from pineal gland
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9
Q

Male effect (>sheep)

A
  • Introducing a buck into a group of transitional period does to activate LH secretion and induce ovulation
  • Epididectomized/vasectomized males or androgenized females
  • 1 tears for 40-50 females
  • No sight sound or smell for 30 days, then abruptly introduce male - 48hrs for effect
  • Silent ovulation since no P4 priming = no response to E2
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10
Q

Flushing females before breeding

A
  • Increased energy before or early in breeding season = increased ovulation rate = increased twinning rate
  • 1lb high-energy supplement (corn, oats, barely) per day 2-3 weeks before breeding
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11
Q

The use of hormone treatments requires

A

the goat to be cycling

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12
Q

Synthetic progesteron/progestins in goats

A
  • Sponges intravaginal
  • CIDR (330mg) progesterone***
  • Melengesterol acetate in feed
  • 5-14 days, estrus shown in 24-96 hours after withdrawl
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13
Q

Ovulation induction in goats

A
  • eCG/PMSG (equine chorionic gonadotrpin/ pregnant mare serum gonadotripin) - acts directly on OVARY to stimulate ovulation (FSH-like), longer half life (36hr)
  • GnRH agonists - act on ANTERIOR PITUITARY to stimulate LH/FSH activity, short half-life (0.5-1hr)
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14
Q

Describe the process of ovulation induction during the seasonal transition period.

A
  • Progestin for >14d (18-21) + PG600 on the day of or 24-48 hours before progestin removal
  • Ram/buck effect in late transition as well as progestin tx similar to early transition
  • Photoperiod manipulation (begin during summer)
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15
Q

Describe the process of ovulation induction outside of the breeding season.

A
  • Progestin > 14d (18-21) + PG600 the day of or 24-48hr before progestin removal
  • Artificial lighting programs: minimic long days ~60d followed by short days for 60d or natural light
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16
Q

What are the AI options for goats?

A
  • Fresh semen intravaginal, cervical, or transcervical intrauterine
  • Laparoscopic intrauterine insemination for frozen semen
17
Q

How many cervical rings does a doe have?

A

4

18
Q

Estrous cycle synchronization for AI in goats

A

GnRH —> 7 days —-> PGF2a —> 2 days —> GnRH —-> 16hr —-> transcervical AI

19
Q

Intersex conditons in goats

A

Usually in dairy goats –> linked to the polled gene
Generally - phenotypic females that tend to act like males after puberty = male gonads inside

20
Q

Describe false pregnancy in goats.

A
  • Cloud burst or hydrometra
  • Dairy goats due to CL retention
  • Cause unknown
  • Abdominal enlargement, acts like normal pregnancy
  • Fluid in uterus - no fetus or placentomes
  • Tx = prostaglandins, sometimes spontaneously expel themselves
21
Q

What is the gestation length of a goat?

A

Average 150 days

22
Q

Are goats CL dependent or not?

A

Goats are CL dependent = needs CL for the entire duration of the pregnancy

23
Q

What are the important abortifacient viruses in small ruminants?

A

Border disease
Bluetongue virus
Caprine Herpes Virus 1

24
Q

Border disease virus infection in goats occurs when ______________. It is transmitted_________ and abortion can occur ______ of gestation. Fetal infection after ______ results in normal lambs with antibodies.

A

Border disease virus infection in goats occurs when a persistently infected animal is introduced. It is transmitted venereally from shedding rams and abortion can occur at any stage of gestation. Fetal infection after 85 days results in normal lambs with antibodies.

25
Q

What are the 4 syndrome of border disease in small ruminants?

A

Early embryonic death (return to estrus)
Abortion and stillbirth
Congenital malformations
Birth of small, weak lambs with immunosuppression

26
Q

Describe the clinical signs of lambs born after inutero infection of border disease.

A

Cerebellar hypoplasia - rhythmic tremors
Osteopetrosis
Hair follicle dysplasia
Perivascular lymphocytes and plasma cells in multiple organs
Lymphoid depletion

HAIRY SHAKERS

27
Q

Bluetongue virus is cause by ___________ transmitted by _________. The virus infects ___________ cells resulting in _________.

A

Bluetongue virus is cause by a non-contagious arthropod-borne orbivurs transmitted by culicoides as well as ticks and lice. The virus infects vascular endothelial cells resulting in edema and hemorrhage.

28
Q

Bluetongue abortions are contributed to

A

Using the MLV in pregnant animals

29
Q

What species of Brucella is of concern in goats?

A

melitensis = zoonotic…goats cheese!

30
Q

What species of campylobacter can cause abortion in goats?

A

C. jejuni and C. fetus ss fetus

31
Q

C. fetus fetus

A
  • Later term abortion storms in flock in sheep, less common in goats
  • GIT –> invasion into blood stream –> placentitis
32
Q

What parasites are the biggest concern regarding small ruminant abortions?

A

Toxoplasma gondii

33
Q

What lesions are associated with a small ruminant Toxo abortion?

A

Multifocal white-ish necrotic lesions in the cotyledons

34
Q
A

PMM Clinical Rotations (1 decks)

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