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10 Cards in this Set
- Front
- Back
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When was the first recorded instance of AI?
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1322 AD- arab chieftain took a cotton pledget from a recently bred mare and placed in another mare's vagina
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What are the advantages of AI?
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1. Increased utilization of superior sires
2. 90% of genetic improvement is via AI (after 2 generations, male influence in offspring is ~90%) 3. Regular evaluation of semen 4. Can easily transport frozen semen worldwide (increased genetic pool) 5. Eliminates danger, work and expense of keeping a bull 6.Decreased venereal disease transmission |
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What are the disadvantages of AI?
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1. Increased labor and paperwork
2. Risk of worldwide disease transmission ( add abx to semen to prevent) 3. Sperm from some bulls doesn't cool/freeze well 4. increased animal handling |
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Successful AI program depends on:
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1. Fertility, health, nutrition and management of females
2. Ability to preserve and properly deliver viable sperm to uterus 3. Inseminate at right time (aggressive/accurate heat detection, effective estrus synch program) 4. Proper semen handling/ AI technique |
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How long must semen be in the female repro tract for capacitation to occur?
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8-12 hours
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What is semen stored in for AI?
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LN2 tank- Dewar
In the dewar is a canister, in the canister is a cane, in the cane there are 2 goblets, in each goblet there is 7 straws. |
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What are proper semen storing procedures?
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1. Store tank where it can be seen daily
2. Routinely measure nitrogen level 3. coordinate rapid transfer between tanks 4. elevate tank off the concrete floor (min conduction/corrosion) 5. Maintain proper inventory system |
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How do you thaw semen?
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Universally: 95*F water for 30-60 s (when in doubt, use warm water thaw).
Avoid: 1. Osmotic shock: exposure of semen to water 2. Cold shock: sudden decrease in temperature post-thaw |
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What are common problems using AI in cattle?
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1. Improper timing: MAJOR cause of decreased success!
2. Semen handling (semen hates: light, extreme temp, water) 3. Thawing errors 4. Post-thaw errors (osmotic/cold shock) 5. Poor understanding of Anatomy, improper AI technique |
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Where do you place semen in the cow for AI?
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UTERINE BODY! (~0.7")
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