Artificial Insemination of Goats - extension.oregonstate.edu · Deposit the semen slowly by pushing...
Transcript of Artificial Insemination of Goats - extension.oregonstate.edu · Deposit the semen slowly by pushing...
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Artificial Insemination of Goats
Charles Estill, OSU Extension Veterinarian
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Estill’s qualifications - I like goats!
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Seminar Outline
Why AI?
Synchronization of estrus
Semen handling
Semen storage and shipping
AI equipment
AI techniques
Questions
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Why AI your does?
Eliminate or reduce the cost and bother of maintaining bucks. Increase the rate of genetic improvement through maximal use of superior sires. Increase the number of does to which a buck could be bred.Reduced disease transmission
Estrous synchronization allows several does to be bred the same day. Easy transport of genetics.
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Disadvantages of AI
Costs for equipment and liquid nitrogenIncreased labor for estrus detection and inseminationLack of standard protocols for packaging and quality control Potential for spread of undesirable traits
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Goat semen costs
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So you want to try AI! Doe selection
Good healthBCS 2.5-3Be on improved nutrition for 2-5 weeks prebreedingDisease freeGood mothers
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AI success depends on:
Fresh vs. frozen semenNumber and timing of inseminationsInsemination methodQuality and quantity of semenSemen handling practicesManagement of animals to be inseminated
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Goats can be bred based on signs of heat
A buck does it best!Presence or odor of buck causes most does to display heat signsVulva may be swollen, reddened, and moist during heatTail flaggingRestlessness, vocalization, increased urination
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Vaginal mucus changes during heat(need to use a speculum to see this)
At beginning of heat, very little mucus is presentAs heat progresses, mucus is transparent and found on floor of vaginaTowards the end of heat the mucus is cloudy- best time to breedAt the end of heat the mucus is cheesy and white
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Mucus turns cloudy at optimal insemination time
Photo courtesy Dr. Sherrill Fleming
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Estrus synchronization
Progestogen implants work better than PGF-based programsInject 200-500 IU eCG when sponge or CIDR is removedEvaluate semen before useDoes ovulate around the end of standing estrusExamination of cervical mucus is best guide to AI timing
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Goat synchronization programfor use during the "natural" season
CIDR-G in Lutalyse CIDR-G out+ 200 eCG
Tease Breed
Day 0 Day 7 Day 9 Day 10 Day 11
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Inserting CIDR
Trimming CIDR tail
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Vaginal sponge
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AI timing
Mucus changes from clear and thin to cloudy and stringy late in mid- to late-heat.AI should be just before or when the mucus turns cloudy-usually 12-15 h after start of heat.
Breed again if still in heat 12 h later
TAI- best with fresh semen50-55 h after CIDR removal
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Timed insemination
50-55 h after removal of progestinFresh semen dose - 150 million pmsFrozen semen dose - 200 million pmsConception rates = 50-85%
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Cooled Shipped Semen
Keep for several days?
Semen survival
Conception rates
Ease of handling
Common in some countries/areas
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Frozen Semen
Tanks“Shipper tanks”
WetDryLength of “hold”
“Storage tanks”Liquid nitrogenSizeLength of hold (rating)
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Dewar (Tank) Considerations
Cost
Size
Holding time
Service
Measure LN2 weekly
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Store dewar off concrete
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Handling Frozen Semen
RECORDSWhich tank?
Which canister?
Which cane?
MarkingsID
codes
Name
Etc.
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Identify cane with desired straw
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Lift canister only enough to read canes
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Getting the straw out
Tweezers
Forceps
Keep in neck of tankOut for < 10 seconds
If in doubt, put it back
Take your time
Don’t panic/rush/recheck the record
You need at least 3 hands to do properly!!
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Lift straw from cane and quickly replace cane
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Thawing the straw
From tank to thaw water ASAPPut thaw cup next to tankMake sure it is correct tempOut of sunFrom temperature extremes
Thaw 30-45 seconds minimumCan hold at thaw temp for short period of time, longer than 15 minutes, reduce temp to 900 FBest if used right away
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Place into thaw bath
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Straw Handling
Remove straw from thaw water
Wipe dry
Shake air bubble to end of straw that you are going to cut off
Cut end of straw off with straw cutter or sharp scissors
Load into AI gunWarmed, clean and dry
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Cut end of straw
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Place straw into AI gun
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AI guns
Cassou gun“needle” gunHoegger gunET gunothers
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Preparing the doe for AI
Restraint
Preparation: clean perineumSoap and water
Disinfectants: NOT unless you can rinse off completely
Just water
Dry thoroughly
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Positioning doe in a cradle
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Goat AI kit
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Goat AI – equipment list
Liquid nitrogen tank Speculum (25 x 175 mm for doelings or 25 x 200 mm for does) A.I. light Straw tweezers Sterile lubricant (non-spermicidal) Insemination gun (for straws) Breeding stand or facilities to restrain the doe Thaw box Paper towels Straw cutter Thermometer
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Lube on speculum
Non spermicidal!!!
Enough for the job, but not too muchOn vulvar lips or on speculum
May want to warm lube
Won’t block view of the cervix
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Use non-spermacidal lube
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Insert vaginal speculum
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Insert light into speculum
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Visually locate the cervix. cervix should have a red-purple color and white mucus will be present if the doe is in heat and at the proper stage for insemination
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Press speculum against cervix
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Place AI pipette into cervix
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Place AI pipette into cervix
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AI techniqueVaginal insemination
Generally poor conception ratesUse 3 billion PMS/insemination
Cervical inseminationElevate rear legs in bale of hayPlace lubed speculum into vaginaWith aid of a light, place pipette as far into cervix as possibleDeposit semen in cervixMID 200 million PMS
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Goat AIInsert the insemination gun into the speculum and thread it into the opening of the cervix. Use a circular motion and slight pressure to work the insemination gun through the rings of the cervix. Do not penetrate the cervix more than 1.5 inches. Deposit the semen slowly by pushing the plunger forward.
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S-L-O-W-L-Y inject semen
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Withdraw speculum
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How the equipment fits together
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Clean equipment
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Rinse, rinse, rinse
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Deep intrauterineAI
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Laparoscopic insemination
Visualize uterus so semen is placed directly into lumenHeld of feed and water for 24hDoes is sedated and placed on her back with head downLaparoscope and insemination pipette are placed through separate openings in the abdomenPlace 20 X 106 PMS in both horns
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Transcervical insemination
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Next Spring