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Guidelines for young stock

Extract: 

General Guidelines
ALL animals must have shelter from the wind and be able to use the shelter at the same time- This may be a wind block, trees, or an enclosure for mature animals. 

Increase food availability - animals are spending a lot of energy staying warm.

Make sure fresh water is available to all animals.  Snow is not a water source for animals.

A lactating cow will drink in excess of 15 gallons of water per day.  A weaned heifer will consume 5 gallons per day.   They must be offered this throughout the day.  If water cannot be continuously available to animal’s offer them water two to three times a day until all animals have drank their fill.

All vulnerable animals (young animals, a body condition score < 2, sick animals, or have a thin or wet hair coat) should be kept out of the wind with a bedding source to prevent contact with frozen ground. They will be much more vulnerable to the cold then healthy mature animals.

Any animals shivering MUST be immediately moved to a warmer area.

Specific guidelines for young stock

Newborns:
Do not expose newborns to outside temperatures if not 100% dry.  Calves may be kept in the calving area longer by putting bedding in a stock tank or blocking off a corner of the calving pen and bedding it well to minimize risk of exposure to disease pathogens from cows.  When newborns are moved to the nursery area - keep them warm and out of the wind.  They are as vulnerable to cold as a poorly dressed person in this weather due to their limited body fat reserves, large surface area and minimal hair coat.  Transport them in a box, trailer, or covered device with bedding.  Do not move in open such as in bucket or wheel barrow without bedding and at least a calf blanket.  Below 42F they are spending energy to maintain their body temperatures and are vulnerable to frost bite, hypothermia, and starvation.

Milk-fed Calves:
At -13F ( current temperature in Madison)  a 100 lb calf needs 1.59 lbs of dry matter from milk (~7 quarts of whole milk) JUST for maintenance and  a 200 lb calf needs  2.7 lbs of dry matter (~ 10 quarts of whole milk) just for maintenance.  This does not take into account the wind chill and does not apply to calves that are even slightly damp.  This means that calves CAN NOT get enough energy from 4 or even 6 quarts of milk per day in this weather. 

For calves to maximize the use of their energy in this weather ensure they are dry, have enough bedding to at least partially cover their back leg and calf blankets should be considered.  Any sick calf should have a blanket in this weather as they are especially vulnerable to the cold. Keep in mind that calves spent approximately 16 hours a day laying down.  Make sure they have a warm surface to do this.  Ears are particularly vulnerable at this time so make sure that the calves cannot suck on each other’s body parts as it can lead to frost bitten ears.

Do not wean calves during this extreme cold weather - this will be very stressful for these animals and leave them vulnerable to illness and weight loss.

Replacement Heifers:
Heifer’s energy needs greatly increase in this weather.  Compared to 32F (5mph wind) maintenance requirements can roughly double for most animals.

Example 1) A 600 lb Holstein heifer - not pregnant

Temperature Wind speed Coat Condition % Increase in maintenance energy demands compared to 32F and 5mph
-13 F 19 Dry 210 %
-13 F 19 Wet 290 %
-13 F 3 Dry 180 %

At -13F, with no shelter from the wind a 600 lb calf’s energy demands could increase between 2-3 times depending on coat condition and wind speed compared to a day when the temperature is 32F with 5mph wind.

Example 2) The energy demands of an 18 month old 926 lbs Holstein heifer at 90 days pregnant at -13 F compared to energy demands at 32 F.

Wind speed Coat Condition % Increase in energy demands compared to 32F and 5mph
19 Dry 180 %
19 Wet 240 %
3 Dry 120 %

At -13 F an 18 month old pregnant Holstein heifer (926 lb) energy demands could range from 1.2 to 2.4 times greater compared to their maintenance requirements on a day at 32 F with 5 mph winds.

Amy Stanton, PhD
Assistant Professor
Dairy Cattle Wellbeing Specialist
Department of Dairy Science
1675 Observatory Dr.
Animal Science Building Rm 281
Madison, Wi 53719
Email: alstanton@wisc.edu
Phone: 608-890-4781

Source: 

Amy Stanton, PhD
Assistant Professor
Dairy Cattle Wellbeing Specialist
Department of Dairy Science
University of Wisconsin