0202WarmingColdStressedCalv.cfm Rewarming cold-stressed calves
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Rewarming cold-stressed calves

Several years ago, an Oklahoma rancher called to tell of the success he had noticed in using a warm water bath to revive newborn calves that had been severely cold stressed. A quick check of the scientific data on that subject bears out his observation, according to Oklahoma State University Emeritus Extension Specialist Glenn Selk.

Canadian animal scientists compared methods of reviving hypothermic or cold-stressed baby calves. Heat production and rectal temperature were measured in 19 newborn calves during hypothermia (cold stress) and recovery when four different means of assistance were provided. Hypothermia of 86 degrees F rectal temperature was induced by immersion in cold water. Calves were rewarmed in a 68 to 77 degrees F air environment where thermal assistance was provided by added thermal insulation or by supplemental heat from infrared lamps. Other calves were rewarmed by immersion in warm water (100 degrees F), with or without a 40cc drench of 20 percent ethanol in water. Normal rectal temperatures before cold stress were 103 degrees F.

The time required to regain normal body temperature from a rectal temperature of 86 degrees F was longer for calves with added insulation and those exposed to heat lamps than for the calves in the warm water and warm water plus ethanol treatments (90 and 92 versus 59 and 63, respectively). During recovery, the calves rewarmed with the added insulation and heat lamps produced more heat metabolically than the calves rewarmed in warm water. This represents energy that is lost from the calf's body that cannot be utilized for other important biological processes. Total heat production (energy lost) during recovery was nearly twice as great for the calves with added insulation, exposed to the heat lamps than for calves in warm water and in warm water plus an oral drench of ethanol, respectively. By immersion of hypothermic calves in warm (100 degrees F) water, normal body temperature was regained most rapidly and with minimal metabolic effort. No advantage was evident from oral administration of ethanol. (Source: Robinson and Young, University of Alberta, J. Anim. Sci., 1988.)

When immersing these baby calves, do not forget to support the head above the water to avoid drowning the calf that you are trying to save. Also it is important to dry the hair coat before the calf is returned to cold winter air. If the calf does not nurse the cow within the first few hours of life (6 or less), then tube feeding of a colostrum replacer will be necessary to allow the calf to achieve passive immunity by consuming the immunoglobulins in the colostrum replacer.

Obviously, not every calf born in cold weather needs the warm water bath. However, this is apparently a method that can save a few severely stressed calves that would not survive if more conventional re-warming methods are used.



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