Recovery of Neonatal Lambs From Hypothermia With Thermal Assistance

Robinson, J. B. D.; Young, Bruce A.

doi:10.4141/cjas88-017

Cited by 6 publications

(10 citation statements)

References 15 publications

(9 reference statements)

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“…Rewarming from 30 to 37~ in the added insulation, heat lamp, the warm water and warm water plus ethanol treatments required heat production through metabolism of 198, 186, 94 and 95% of the heat needed simply to increase body heat content. These estimates, similar to results previously reported for neonatal lambs Robinson and Young, 1988), indicate a net influx of heat from immersion in 38~ water. The calves in the present study gained about 5% of the needed body heat from the warm water, whereas those in air environments with or without supplementary heat lost substantial amounts of heat to the environment during rewarming and thus required a greater metabolic effort to recover euthermia.…”

Section: Discussionsupporting

confidence: 90%

“…Furthermore, during body cooling, the metabolic heat production of the calves declined at the rate of .65 W/kg per C ~ decline in Tr. Similar rectilinear decreases in the maximum metabolic rate with the development of hypothermia has been reported in newborn lambs (Alexander, 1962;Robinson and Young, 1988) and adult sheep (Bennett, 1972). From these rates of decline in metabolic heat production, the temperature of zero metabolism can be estimated.…”

Section: Discussionsupporting

confidence: 75%

“…From these rates of decline in metabolic heat production, the temperature of zero metabolism can be estimated. For the newborn calves in the present trial, zero metaboiism would occur when Tr reached 23~ similar estimates for newborn lambs are 19 to 26~ (Alexander, 1962) and 21~ (Robinson and Young, 1988).…”

Section: Discussionsupporting

confidence: 67%

“…As body temperature approaches the temperature of zero metabolism (estimated in lambs and calves to be about 20~ recovery becomes more difficult. With a Tr of about 30~ the maximum metabolic heat production was about half the summit metabolism of an euthermic animal but, as shown in our study and by Robinson and Young (1988), calves and Iambs can recover from this level of hypothermia.…”

Section: Discussionsupporting

confidence: 58%

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Metabolic Heat Production of Neonatal Calves during Hypothermia and Recovery

Robinson

Young

1988

Journal of Animal Science

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Metabolic heat production and rectal temperature were measured in 19 newborn calves (41.8 +/- 3.7 kg) during hypothermia and recovery when four different means of assistance were provided. Hypothermia of 30 degrees C rectal temperature was induced by immersion in 18 degrees C water. Calves were rewarmed in a 20 to 25 degree C 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 (38 degrees C), with or without a 40-ml drench of 20% ethanol in water. Resting (prehypothermia) and cold-induced summit metabolism of the calves was 2.5 +/- .1 and 8.2 +/- .22 W/kg and occurred at rectal temperatures of 39.5 +/- .06 and 36.2 +/- .26 degrees C, respectively. During cooling, metabolic heat production declined at the rate of .65 W/kg per degrees C decline in rectal temperature. The time required to regain euthermia from a rectal temperature of 30 degrees C 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 vs 59 and 63 +/- 6.4 min, respectively). During recovery, the calves rewarmed with the added insulation and heat lamps produced more heat metabolically than the calves rewarmed in warm water. Total heat production during recovery was 34.1, 31.1, 18.3, 16.9 +/- 1.07 kJ/kg for the calves with added insulation, exposed to the heat lamps, in warm water and in warm water plus an oral drench of ethanol, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 75%

Section: Discussionsupporting

confidence: 67%

Section: Discussionsupporting

confidence: 58%

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Metabolic Heat Production of Neonatal Calves during Hypothermia and Recovery

Robinson

Young

1988

Journal of Animal Science

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“…Warm water baths have long been considered superior to heating pads, infrared lamps, or blankets for hypothermic resuscitation of calves because of a faster return to euthermia with reduced energy expenditure 8‐10 . Unfortunately, the practicality of this process renders it challenging for on‐farm use and has been replaced by commercial forced air delivery systems.…”

Section: Introductionmentioning

confidence: 99%

Randomized comparison between a forced air system and warm water bath for resuscitation of neonatal hypothermic calves with or without oral administration of caffeine

Copeland,

Kreuder,

Dewell

et al. 2024

Veterinary Internal Medicne

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BackgroundHypothermia is a cause of neonatal calf death in cold climates. Practical and effective rewarming methods are important for bovine health within affected regions.Hypothesis/ObjectivesTo compare the rewarming rate and blood analytes (glucose, lactate, and cortisol) of calves resuscitated with forced air with warm water bath, with or without oral administration of caffeine.AnimalsTwenty healthy neonatal Holstein bull calves.MethodsIn this randomized, prospective study, calves born healthy and without history of dystocia were cooled to 32°C rectal temperature then thermally resuscitated using either forced air rewarming or warm water bath (40°C) with or without oral administration of caffeine. Rectal temperatures were used to quantify recovery rate. Measurements of glucose, lactate, and cortisol were recorded for every 2°C change in rectal temperature.ResultsRectal temperature decline (0.03°C per minute) and total cooling time (191.0 ± 33.3 minutes) did not significantly differ among treatment groups. Calves were successfully resuscitated to 38°C by either method. Time required to euthermia using warm water was significantly faster (0.1°C per minute; 64.3 ± 17.8 minute; P < .05) than forced air (0.05°C per minute; 123.1 ± 20.0 minutes). Caffeine had no significant effect on resuscitation rate (P = .14; 95% CI, −0.002 to 0.024) in either treatment; however, caffeine was associated with reduced time to euthermia by 8.3 and 10.8 minutes, respectively. Changes in metabolic variables (glucose, lactate, and cortisol), were inversely related to rectal temperature with no statistical significance among rewarming methods.Conclusions and Clinical ImportanceAlthough warm water submersion is faster, forced air rewarming is an effective alternative for restoration of euthermia.

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The Peripartum Ruminant

House¹

2020

Large Animal Internal Medicine

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Recovery of Neonatal Lambs From Hypothermia With Thermal Assistance

Cited by 6 publications

References 15 publications

Metabolic Heat Production of Neonatal Calves during Hypothermia and Recovery

Metabolic Heat Production of Neonatal Calves during Hypothermia and Recovery

Randomized comparison between a forced air system and warm water bath for resuscitation of neonatal hypothermic calves with or without oral administration of caffeine

The Peripartum Ruminant

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