Lecture 10: Sire Fertility Flashcards

1
Q

Sir Attributes

A

required for high fertility

  • physical soundness
  • quality semen
  • serving capacity
  • P= G+E + GE
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2
Q

Breeding Soundness Exam

A

assess sire’s ability to fertilize
- history: general supporting information
- general exam: overall physical soundness
- Repro exam: physical examination of repro
- semen exam: production of viable sperm
- mating eval. libido, mating ability
want progressive motility of about 70%
want morphological normal sperm about 80%

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3
Q

Body Composition Score

A
consider
- bone visibility 
- body outline
- ideally 2.5-3.5
BCS will decline over breeding season
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4
Q

Seasonal Influence

A
trends:
season influences sperm quality, BSE
- temp, sensitive
season influence is delayed 
- impacts sperm development
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5
Q

Age influence

A
trend 
- appears somewhat consistent over time 
Effects in BSE and Semen 
Trends: 
- increase after sexual maturation
- decrease with advantage age
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6
Q

Scrotum size influence

A

quality increases with scrotum size

  • not just quantity
  • testosterone increases with scrotum size
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7
Q

BSE conclusions

A
multiple factors influence fertility 
limitations
- fertility is non-binary
- cant identify sublte issues
- innate variability 

benefits

  • identify subfertile sires
  • improve reproductive efficiency
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8
Q

Artificial Insemination

A
distribute semen from high-quality sires
the dose must be: 
- properly handled and transported 
- high quality, fertile semen
- form high genetic value sire
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9
Q

Semen Storage

A

to protect and transport
standards vary with species
- freezing is most common
- boar doesn’t freeze well

extenders

  • cryoprotectant
  • provide nutrients
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10
Q

Genetic Value

A
varies by location 
factors; 
- aesthetic preference 
- cultural norms
- industrial standards
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11
Q

Fertility Measurements

A

non return rate (NRR): from breedings without subsequent doses, easy to collect, skewed by external factors

Sire conception rate: from breedings with vet confirmed conception, harder to collect, normalized for external factors

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12
Q

Fertility Factors

A

several traits influence sperm fertility

  • morphology
  • motility
  • concentration
  • chromatin integrity
  • plasma membrane integrity
  • acrosome integrity
  • mitochondrial potential
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13
Q

Sperm Assessment

A

visual metrics
makler sperm chamber
- manual , time intensive
- cost-efficient

CASA

  • automated, efficient
  • expensive software
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14
Q

Fixing Fertility

A

high concentration linked to high fertility
compensable triats; increase concentration improve fertility
incompressible traits: increase concentration has no effect on fertility

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15
Q

Sperm Quality

A

effect on embryo development
average sperm- more high quality embryos
below average sperm- fewer high quality embryos

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16
Q

Age influence

A

AI market trending to younger bulls
Benefit: access advanced genetics faster
Risk: sires are unproven