dairy facilities and cow comfort - · pdf filedairy facilities and cow comfort ... feed line...
TRANSCRIPT
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PHR 429D
Dairy facilities and Cow Comfort
Jim Reynolds DVM, MPVM
Veterinary Medicine Teaching and
Research Center, Tulare, CA
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Goals:
• Describe dairy facilities with systems
approach
• Integrate the needs of the cow and calf
(husbandry and welfare) with the
production and economic needs of the
dairy
• Describe basic facility types
• Describe some assessment tools
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3
• The Animal
Agriculture Industry
in the US is not
uniform
• Facilities and
management varies
between region and
within regions
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Types of Dairy Facilities
• Pasture
• Drylot
• Freestall
• Tie-stall
• Combinations
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Cow Comfort
The basic needs for the cows and calves:
• Feed and water
• Shelter
– Should be kept clean and dry
• Safety
• Milking
• Observation and treatment
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Cow Comfort
There are 2 reasons for cow comfort:
• Animal Welfare
• Economics
• They both are served when the dairy
provides appropriate facilities and
management
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Take-Home Message:
• The main management goal for a dairy is
to facilitate Dry Matter Intake
• All cow comfort strategies are based on
maintaining or increasing dry matter intake
• DMI associated with:
– Immune functions
– Milk production
– Reproduction
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Challenges to Maintaining Dry
Matter Intake in Dairy Cattle
• Environmental
– Heat
– Rain/snow
• Muddy corrals
• Physiological
– Transition period
– Calving
– Social interactions/grouping/moving
– Disease
Cows and manure are not supposed to be together
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Facilities and Cow Comfort
• Dairy facilities should be designed to keep
the cows and calves comfortable in order
to maintain DMI and thus maximize
economic production
• Dairies are groups of systems that interact
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Some of the Facility and
Management Systems on Dairies
• Housing – cows and replacements
• Feeding
• Milking
• Manure
• Special needs
– Maternity
– Fresh cows
– Hospital
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Calving Milking Dry lot
Heifer calves Growing replacements
Feeding system
Manure system
Crop production
Storage Mixing Delivery
Storage Distribution
Dairies are groups of systems
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Daily time Budget for Dairy Cows
• Milking 2-4 hours (3)
• Eating/drinking 2-4 hours (3)
• Socializing/standing 2-8 hours (3)
• Lying 12-14 hours (14)
24
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Cow Comfort and Milk Production
• Standing cow circulates 60 gallons of
blood/hour through her udder
• Lying cow circulates 90 gallons of
blood/hour through her udder
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Issues for Cow Comfort on
California Dairies
• Heat Stress
• Sanitation/manure
• Freestall design and maintenance
• Walking surfaces
• Walking distances/parlor milking times
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Bovine Thermal Neutral Zone
• Thermal neutral zone: the environmental
temperature range that needs neither
extra heat generation nor heat loss
• Adult cow:
– somewhere between 10° and 68°F
• Calf:
– 50 to 85°F in still air
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Heat stress
• Combination of temperature and humidity
that negatively impact cow health and
performance
• Temperature Humidity Index > 72
– THI = dbt – (0.55 x RH) (dbt -58)
– dbt = dry bulb temperature (F)
– RH = relative humidity (%)
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THI and Stress as Function of
Temperature and Humidity
20
40
60
80
100
75 80 85 90 95 100 105
Mild Stress
Stress
Severe
Stress
THI 70
THI 80
THI 90
THI 100
Outdoor Air Temperature (F)
RH
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Physiologic Effects of Heat Stress
Increases:
• Respiration rate
• Rectal temperature
• Water intake
• Sweating
• Salivation
Decreases:
• Dry matter intake
• Rate of feed passage
• Blood flow to internal
organs
• Rumen buffering
• Milk production
• Reproduction
DMI can be decreased 6-16%; Milk production by up to 20%
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Table 1. Effect of Heat Stress on Dairy Cattle
THI Stress Level Comments
< 72 None
72 – 79 Mild Dairy cows will adjust by seeking shade, increasing respiration rate and dilation of the blood vessels. The effect on milk production will be minimal.
80 – 89 Moderate Both saliva production and respiration rate will increase. Feed intake may be depressed and water consumption will increase. There will be an increase in body temperature. Milk production and reproduction will be decreased.
90 – 98 Severe Cows will become very uncomfortable due to high body temperature, rapid respiration (panting) and excessive saliva production. Milk production and reproduction will be markedly decreased.
> 98 Danger Potential cow deaths can occur
Adapted from information provided by Monsanto
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Total DMI and pounds dry matter required for maintenance
with increasing environmental temperature (dew point =30)
0
10
20
30
40
50
60
68 77 86 95 104
DMI
Maint. Req.
Lbs DM
Temperature
Holter, West and McGilliard. 1997. JDS 80:2188
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Milk Production Losses with THI
-10
-8
-6
-4
-2
0
70 72 74 76 78 80
30 lb/day 40 lb/day 50 lb/day
Loss in milk
(lb/day)
Temperature Humidity Index
Hahn and McQuigg, 1967
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Heat Loss in Dairy Cattle
• Conduction
– Heat flows from warm to cold
• Convection
– Warm air near skin is replaced with cool air
• Radiation
– Temp. difference between environ. and cow
• Evaporative Cooling
– Sweating and panting
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Two Ways to Reduce Heat Stress
• Provide cooler environment
– Reduce direct solar radiation (shades)
– Decrease cow density
– Cool the air (misting systems)
– Create air movement (draw out hot air)
• Cool the cow
– Soak the cow (sprinklers) and dry the cow
– Maximize the number of wet-dry cycles/hour
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Where can we cool cows?
• Holding pens
• Feeding areas
• Freestall barns
• Shades
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Priorities to reduce Heat Stress
(lactating and dry cows)
1. Provide plenty of
water
2. Shade
3. Reduce walking
distance
4. Reduce time in
holding pen
5. Improve housing
ventilation
6. Add holding and exit
lane cooling
7. Cool close-up cows
8. Cool fresh and early
lact. Cows
9. Cool mid and late
cows
10.Cool far-off cows
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Summary of Spray and Fan
Systems (cow cooling)
• Fans alone do little to reduce heat stress
• Water is the key
• Increasing soaking frequency reduced respiratory rates
• Increase soaking as temp. increases
• 1 lb of water evaporated 1,000 BTU
• Milk production responses 4-12 lbs/cow/day
• Net income of $1-1.50 cow/day
Brook, Smith, Harner KSU Cow Comfort Consortium 2001
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Recommendations for cooling dairy
cows with fans and water
• Fans on at 70 F
– Over freestalls and perhaps feedline
• 3 ft fans every 20 feet; 4 ft fans every 40 feet
• Sprinklers/ soakers on feedline
• Cycle water on 2-4 minutes
• Fans on 4-10 minutes
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Freestall Housing
• Can provide improved
comfort in winter and
summer
– Improved cooling ability
– Can support increased DMI
• Necessary where rains or
snows
• More expensive to build
than drylots
• May create difficulties for
reproduction
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Freestall barns
• 2 row or 4 row
• Provide shelter
(shade) and
ventilation
• Cross-ventilation
important
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Lying down in a free stall
Each cow needs to lie down for at least 12 hours a day, with an optimum of 14 h a day.
Need for a free stall that enables a cow to lie down
And.. a stall that makes the cow WANTING to lie down!
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Head to Head Freestall
Holsteins A B Min. Width
First Lactation 68" 46" 46"
Milking Cow 70" 59" 48"
Dry Cows 70" 48" 50"
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Sand Bedded Freestall
Cow Pen Description Dimension
A B C
First Lactation Milking Pen 70 48 A-D
Mature Cow Milking Pen 72 50 A-D
Pre-fresh Mature Cow Pen 72 54 A-D
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Mattress Bedded Freestall
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Freestalls
4 reasons freestalls fail:
• Lunge space
limitations
• Lack of
comfort/cushion
• Neck rail placement
• Lack of fresh
air/vision
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Stall size and lunging
Normal lunge Abnormal lunge
(short beds)
Weight is transferred off rear legs
by lunging forward, using the knees
as a pivot point.
Majority of weight is lifted by rear
Legs due to inadequate lunge space.
Excess bedding kicked out and less
Stall use.
7.5 to 8 feet Less than 7.5 feet
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Freestall bedding
• Absorbs moisture
• Provides cushion
• Dissipates heat
Types of bedding:
• Sand
• Dry manure
• Mattresses
• Rubber mats
• Sawdust/shavings
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Sand Freestall Bedding
• Can be most hygienic
– Inorganic
– Supports lower bacterial
growth
• Comfortable for cow
• Hard on flush systems
– Need sand traps
• Can be expensive
– Use 40 to 70 lbs/stall/day
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Manure Bedding
• Commonly used in California
• Less expensive
• Comfortable for cows
• Should use composting system
• Acceptable when kept dry
• Can have high bacteria counts when wet
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Cow Preferences for Free Stalls
• U of Wisconsin study (100% stocking density)
• % of time stalls have cows lying in them
Washed sand 69%
Rubber-filled mattresses 65%
Foam-filled mattresses 57%
Waterbed 45%
Rubber mat 33%
Concrete stall base 23%
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Freestall Comfort Items
• Concrete flooring
– Can be hard on feet
(esp. new concrete)
– Can become slippery
• grooving
• Rubber belting/mats
– Reduces wear on
hooves
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Freestall Comfort Items
• Manure moved as solid or liquid
• Flush system – Determines amount of
manure and water at feet
– Associated with hygiene scores and lameness
– Volume X velocity
– Vacuums
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http://svmweb.vetmed.wisc.edu/dms/fapm/fapmtools/stalls.htm
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Cow Housing: drylot or freestall
• Drylot:
– Lower capital investment (3 to 4 times less)
– Easier to maintain
– More forgiving for hoof health
– Facilitates reproduction
– Requires dry environment
– Provides less cow comfort in heat and rain
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Dry lot dairies
• Moisture deficit > 20 in./year
– MD = evaporation – precipitation
– Cow = 12 inches of precipitation
• 500 – 700 sq. ft. / cow
• Shade
– 50 – 60 sq. ft. /cow (North-South)
• Slope
– 2-3% slope
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Dry Lot Facilities
• Shade
– should be provided for all milking cows, dry cows and
replacement animals from 0 to 5 months of age.
– In areas of extreme heat-stress, shade should be
provided for all replacement animals.
– In an AZ trial, a 6% increase in milk production was
observed from providing 3.7 sq. m of solid shade/cow.
– An additional AZ trial indicated that shade over the
feed line increased milking production 3% because
feed intake increased.
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Drylot cooling systems
• Evaporative type cooling systems under
the shade has increased milk production 6
to14% depending on the stage of lactation,
level of heat-stress and the design of the
cooling system.
• Evaporative cooling systems for corral
cooling can vary from $150 to $450/cow.
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Dry Lot Facilities
• Walking distance of cows from the corral to the milking parlor should be minimized in the dairy design.
• Observations in hot weather indicate one-way lane walking distances from the corral to the milking parlor should be:
– less than 365m for 2X milking
– 274m for 3X milking
– 183m for 4X
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Dry Lot Facilities
• Corrals need to have a 2 to 2.5% slope to
provide adequate drainage
• area of 46 to 70 sq. m/cow. depending
upon the annual evaporation
• corrals need to be maintained by removing
excessive dry manure from the corral.
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Maternity/Calving Areas
• Goal is to have calf
born in clean, dry
place
• Options:
– Individual pens
– Bedded packs
– Corrals
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Milking Parlor
• Want cows to spend less
than 1 hour away from
pens at any time
• 3 hours total per day
• Calm cow flow
• Types of milking parlors:
– Parlor
– Herringbone
– Parallel
– Rotary
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Water and Feed Availability
• Must have constant access to water – 2” water trough/animal
• Want 1:1 headlocks to cows
• Can crowd to 110%
• Drylots more forgiving when overcrowded
• Overcrowding reduces DMI
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Techniques for assessing facilities
and welfare
2 basic methods:
1) outcome based
Use animals to see if standards are
met
2) protocols
Create a system or facility that should
result in the desired outcome
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Assessment of Key Welfare
Parameters on dairies
1) Nutrition – feed and water • BCS: % of cows < 2.0 and > 4.0
2) Housing –clean, dry, comfortable housing • Hygiene scores
• Hock scores or lesions
• Locomotion scores: % > 2.0
3) Health – disease prevention, recognition and treatment, euthanasia
4) Animal behavior and social interaction
5) Minimal stress – calm handling and secure housing
6) Management – is management committed to the welfare of the animals?
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