A paper resulting from my 3 month sabbatical stint at the Univeristé de Lyon has just been published in the Proceedings of the Royal Society B.  Using a small recording device that remains inside the crop, we were able to examine core temperature relationships over the course of growth, feeding, and fasting.  In the process, we discovered that fasting leads to greater heat conservation (revealed via thermal imaging) as well as changes to short term core temperature changes.  Ducklings show lower core temperature variation in the short term when fasting than when fed.

Here is the citation:

Tattersall GJ, Roussel D, Voituron Y, Teulier L (2016) Novel energy-saving strategies to multiple stressors in birds: the ultradian regulation of body temperature. Proceedings of the Royal Society B 283(1839): 20161551. http://dx.doi.org/10.1098/rspb.2016.1551

Electronic supplementary file is here.

Here are the data, uploaded to data dryad data repository:

Tattersall GJ, Roussel D, Voituron Y, Teulier L (2016) Data from: Novel energy-saving strategies to multiple stressors in birds: the ultradian regulation of body temperature. Dryad Digital Repository. http://dx.doi.org/10.5061/dryad.gt5c0

And a sample figure: