34° C. As his food supply dwindles from autumn to the beginning of winter it becomes difficult or impossible for the hedgehog to maintain this rate. One by one all the "energy providers", the beetles and other prey animals disappear. Shortening day length and sinking temperatures also influence their readiness to hibernate, there are also hormonal changes. Then the hedgehogs retire and go into hibernation.
top
Timing of Hibernation
When hedgehogs have gained enough weight, they will hibernate. The males hibernate first, depending on the weather, it can be as early as the beginning of October. The females follow when they have recovered from rearing their young. The juveniles hibernate last, because they need more time to gain sufficient weight. A young hedgehog should weigh at least 500 grammes by the beginning of November to survive his first hibernation in the wild.
Metabolic changes
In hibernation all vital functions are reduced to a bare minimum. Metabolic rate is reduced on average to 1.5% of that of an active animal:
- Body temperature sinks close to the ambient temperature
- Heart rate slows from approx. 200 to 2-12 beats per minute
- Respiration drops from 50 times to only 13 times a minute
- There are other rapid changes to the internal organs e.g. reduction in blood sugar level
When the ambient temperature falls to about 5° C the hedgehog produces some warmth to maintain a minimum temperature to prevent it freezing.
top
Duration of hibernation
Hibernation lasts on average 5 to 6 months. Short periods of arousal are normal, the hedgehogs awake, remain in their nests and soon go back into hibernation. Sometimes they are active for a few days and leave their nests. We assume this is to "reset" their metabolic functions back to normal after the massive reductions which take place during hibernation.
top
Entry into and arousal from hibernation
Hedgehogs take about 5-6 hours to enter into hibernation. In the next weeks and months they live off deposits of white fat which they laid down in summer and autumn. Short periods of arousal from hibernation are not unusual.
Auf Futtersuche
Arousal usually occurs when the ambient temperature remains at 10° C for some time. Arousal takes several hours and uses an enormous amount of energy, the hedgehog has special lobes of "brown fat" stored around his shoulders to do this. Blood circulation is increased five-fold, accelerated heart and respiration rates are accompanied by shivering of the muscles, particularly in the legs.
The hedgehog will lose, on average, 30% of his body weight during hibernation. The first priority for the emaciated hedgehog is to search for food, before the annual cycle of mating, reproduction and another hibernation can begin.
34° C. As his food supply dwindles from autumn to the beginning of winter it becomes difficult or impossible for the hedgehog to maintain this rate. One by one all the "energy providers", the beetles and other prey animals disappear. Shortening day length and sinking temperatures also influence their readiness to hibernate, there are also hormonal changes. Then the hedgehogs retire and go into hibernation.topTiming of HibernationWhen hedgehogs have gained enough weight, they will hibernate. The males hibernate first, depending on the weather, it can be as early as the beginning of October. The females follow when they have recovered from rearing their young. The juveniles hibernate last, because they need more time to gain sufficient weight. A young hedgehog should weigh at least 500 grammes by the beginning of November to survive his first hibernation in the wild.Metabolic changesIn hibernation all vital functions are reduced to a bare minimum. Metabolic rate is reduced on average to 1.5% of that of an active animal:- Body temperature sinks close to the ambient temperature- Heart rate slows from approx. 200 to 2-12 beats per minute- Respiration drops from 50 times to only 13 times a minute- There are other rapid changes to the internal organs e.g. reduction in blood sugar levelWhen the ambient temperature falls to about 5° C the hedgehog produces some warmth to maintain a minimum temperature to prevent it freezing.topDuration of hibernationHibernation lasts on average 5 to 6 months. Short periods of arousal are normal, the hedgehogs awake, remain in their nests and soon go back into hibernation. Sometimes they are active for a few days and leave their nests. We assume this is to "reset" their metabolic functions back to normal after the massive reductions which take place during hibernation.topEntry into and arousal from hibernationHedgehogs take about 5-6 hours to enter into hibernation. In the next weeks and months they live off deposits of white fat which they laid down in summer and autumn. Short periods of arousal from hibernation are not unusual.Auf FuttersucheArousal usually occurs when the ambient temperature remains at 10° C for some time. Arousal takes several hours and uses an enormous amount of energy, the hedgehog has special lobes of "brown fat" stored around his shoulders to do this. Blood circulation is increased five-fold, accelerated heart and respiration rates are accompanied by shivering of the muscles, particularly in the legs.The hedgehog will lose, on average, 30% of his body weight during hibernation. The first priority for the emaciated hedgehog is to search for food, before the annual cycle of mating, reproduction and another hibernation can begin.
การแปล กรุณารอสักครู่..
