Burghardt Jilge

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The free-running circadian rhythms of five behavioral functions of the rabbit were masked by unsignalled restricted food access (RF). The rhythms were reorganized immediately, a large part of events being assembled around the end of food availability. In addition to masking a slower process of entrainment was running: a component of anticipatory activity(More)
The direction of temporary phase shifts depends on the timing of the light signal in the dark period (1800-0600). Delays predominated following signals between 2100 and 2400, while advances tended, even more uniformly, to follow signals given between 0100 and 0400. In one animal the caecotrophy rhythm split into 2 components after a light signal at 0400,(More)
We have monitored parturition and different behavioral rhythms of does, the activity of suckling pups and behavioral rhythms of rabbits after weaning until adulthood. All animals were living in continuous light conditions (LL). As a consequence of the free-run of the does parturition, which takes place during the resting period of the animal, occurred at(More)
The rabbit pup is well suited to track the age-dependent development of periodic thermoregulation during the suckling period. Since the litters are regularly nursed once per day for a total of 3 to 4 min, an exogenous, metabolic, nonphotic periodic variable is supposed to have an impact on the 24-h rhythm of body temperature. The authors monitored the(More)
Three main concerns underlie this review: 1) The need to draw together the widely dispersed information available on the circadian biology of the rabbit. Although the rabbit is a classic laboratory mammal, this extensive body of information is often overlooked by chronobiologists, and despite several advantages of this species. In terms of its general(More)
  • B Jilge
  • 1991
Although the rabbit is an almost 'classical' laboratory animal, chronobiological research in this species is in its infancy. It appears not even clear, whether the rabbit is a predominantly diurnal, crepuscularly active or nocturnal animal. In an ordinary, non sound-isolated animal room rabbits exhibited elevated locomotor activity, hard faeces excretion,(More)
Free-running circadian rhythms of rabbits were exposed to a 11:55-11:55-h light-dark (LD) schedule. After complete entrainment (63 +/- 22 days), the predominantly nocturnally active rabbits were exposed to an additional zeitgeber, restricted food access (RF), which was imposed during the light period. In five animals RF had the same period (T) as the LD(More)
Without a zeitgeber the circadian rhythms of five physiological functions free-ran with a period length greater than 24 h. Restricted feeding time (RF) masked the free-running rhythms. In addition to masking, entrainment with RF occurred. This process was most evident in locomotor activity and visits to the food box. RF thus had zeitgeber properties in(More)
  • B Jilge
  • 1993
One of the most important properties of biological oscillators is their entrainment by exogenous forces acting cyclically in the environment. Among the environmental cycles, the phenomena recurring with a circadian periodicity are very prominent. The role of circadian zeitgebers is discussed giving a particular importance to the effects of feeding as a(More)
The term competence, as it first appeared in the European guidelines, was rather poorly defined and hence resulted in some confusion. It was FELASA'sinitiative in working with the various competence categories, which made the concept clear and comprehensive. According to FELASAthere are four competence categories (FELASA1995): Category A-Animal technicians(More)