Adaptive timing of digestion and digestion-related thermogenesis in the pigeon.

Abstract:

:Pigeons were allowed to feed for 1 h either 2 h after lights on (morning pulse) or 3 h before lights off (evening pulse). Body temperature was measured radiotelemetrically. Faecal excretion, as an index of rate of digestion, was measured using load cells. At 22 degrees C, faecal excretion peaked just after lights-on in morning-pulse condition, but not in evening-pulse condition. In the cold (+5 degrees C), the peak was absent. We conclude that at thermoneutrality, pigeons are able to postpone a major part of digestion until late in the dark phase when their body temperature is increasing to the diurnal level. Thus, the extra heat from digestion-related thermogenesis that otherwise would be dissipated into the environment can be used for rewarming. In the cold, such a delay is not necessarily advantageous as the extra heat can always be used to substitute for thermoregulatory thermogenesis. The occurrence of concentrated period of digestion only in the morning-pulse condition was correlated to a lower food intake and lower body temperature as compared with the evening-pulse condition. Restricted feeding may thus be needed to induce adaptive timing of digestion as a mechanism of energy sparing. In addition to storage of food, timing of digestion may be a significant factor in the evolution of the crop in birds.

journal_name

Physiol Behav

journal_title

Physiology & behavior

authors

Laurila M,Hohtola E,Saarela S,Rashotte ME

doi

10.1016/s0031-9384(03)00031-3

subject

Has Abstract

pub_date

2003-03-01 00:00:00

pages

441-8

issue

3

eissn

0031-9384

issn

1873-507X

pii

S0031938403000313

journal_volume

78

pub_type

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