move from water bottles to in-cage automatic water problems & solutions julie watson ma vetmb...
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Move From Water Bottles to In-Cage Automatic Water
Problems
&
SolutionsJulie Watson MA VetMB Dipl ACLAM
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Advantages
Cage change every 2 weeks– Less disturbance– Breed better– Less labor
Dedicated air supply – Disease control– Reduced allergens
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What’s the Problem?
•Water drop usually present•Touch only required
•Water drop absent•New skill required - •Grasp lever in teeth and push•Size & strength needed
Water BottleAuto Water Valve
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WeanlingAdult
Strength required to work the valve: Weanlings have difficulty in working the valve: 5g pressure required to operate the valve
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Mice Need to Learn New Skills: Old mice Singly-housed miceNeurological mutants
Often don’t explore or learn new skills well!
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High Airflow Exacerbates Dehydration
50 Air Changes Per Hour
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Overnight Consequences of
Water Deprivation“Balled-up”
“Hunchback” seen prior to death
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Which Animals need to Transition to Automatic Water?
•All animals previously on water bottles (May include vendor animals)
•All weanlings •From microisolators•From auto water
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SOP for Transition Period
ADULTS Water bottle 2 weeks Remove bottle if full
• Monitor twice daily 2 days• Monitor once daily 12 days• Transport gel plus bottle
if mice dehydrate
WEANLINGS Water bottle 2 weeks if
less than 4 weeks old or new to auto-water
Remove bottle
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TwoWeeks: Water Bottle
Water Bottle Largely Full: Water Bottle Largely Empty
Repeat Once
Remove water bottle:48-hour close observation2 week daily observation
Fail twice, permanent water bottle
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Use the Auto Water Transition Cage Cards
Weanling cardAdult
card
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Appearance of Auto Water Transition Card with Cage Card
Designed to project above cagecard
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Monitor closely twice daily for 2 days
Then daily until next cage change(2 weeks)
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For Signs of Dehydration: Put transit gel in cage Replace water bottle Veterinary help if severely dehydrated
2 attempts to remove water bottleIf fail twice, then permanent bottle &
use water bottle sticker to flag cage
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Animals that do not Transition-Check Food Supply
NOTE: the water bottle takes up space normally used for food. With large # of mice in the cage, food and water may need to be topped off before the 2 week cage change
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Offspring Usually Transition to Auto-Water Even if Parents Don’t
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Additional Procedures to Prevent Problems
Wean at 4 weeks– bigger and more able to
work the water valve
ALWAYS use nest material
- mitigates the effect of high air flow
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Summary: Mice New to Auto Water
Use water bottle first 2 weeks.
Remove water bottle ONLY if largely full
Monitor VERY closely (twice) for dehydration signs
first 2 days, then daily until first cage change. Toggle
lickers each time.
Use ‘Auto Water Transition’ cage cards
Label cages with water bottle stickers and keep on
water bottles if fail to transition twice
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Summary: Weanlings
If new to automatic water or under 4 weeks old, follow
same protocol as adults new to automatic water: ie
water bottle first 2 weeks after weaning followed by
close monitoring for 2 weeks.
If already on auto water and at least 4 weeks old, use
close-monitoring SOP only.
Remember weanlings may have problems with
STRENGTH and can dehydrate even after one week
on automatic water.
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The End