TY - JOUR
T1 - Heat production induced by photoperiodicity in the pigeon
AU - Haim, A.
AU - Saarela, S.
AU - Hissa, R.
PY - 1979
Y1 - 1979
N2 - 1. 1. The effect of photoperiodicity on heat production was studied in pigeons (Columba livia) acclimated to 12L:12D, 24D, 4L:20D and 24L at Ta = 22°C, to 4L:20D at Ta = 32°C and to 24L at Ta = 2°C. 2. 2. Pigeons acclimated to 4L:20D at Ta = 22°C increased oxygen consumption significantly (P < 0.05) at Ta= 26°C and Ta = 6°C, compared to the control group (12L:12D at Ta = 22°C). Body weight in these birds decreased significantly (P < 0.01 ) due to acclimation. 3. 3. Oxygen consumption was high but not significantly increased in pigeons acclimated to cycles of 4L:20D at Ta = 32°C and 24L at a = 2°C. 4. 4. Pigeons acclimated to 24D were significantly hypothermie (P < 0.01) due to acclimation (at Ta = 22°C), while no change in body weight was observed. 5. 5. Photoperiod influences heat production to a similar degree as does ambient temperature. Acclimation to cycles of a long scotophase had the same effect on heat production as acclimation to a cold ambient temperature.
AB - 1. 1. The effect of photoperiodicity on heat production was studied in pigeons (Columba livia) acclimated to 12L:12D, 24D, 4L:20D and 24L at Ta = 22°C, to 4L:20D at Ta = 32°C and to 24L at Ta = 2°C. 2. 2. Pigeons acclimated to 4L:20D at Ta = 22°C increased oxygen consumption significantly (P < 0.05) at Ta= 26°C and Ta = 6°C, compared to the control group (12L:12D at Ta = 22°C). Body weight in these birds decreased significantly (P < 0.01 ) due to acclimation. 3. 3. Oxygen consumption was high but not significantly increased in pigeons acclimated to cycles of 4L:20D at Ta = 32°C and 24L at a = 2°C. 4. 4. Pigeons acclimated to 24D were significantly hypothermie (P < 0.01) due to acclimation (at Ta = 22°C), while no change in body weight was observed. 5. 5. Photoperiod influences heat production to a similar degree as does ambient temperature. Acclimation to cycles of a long scotophase had the same effect on heat production as acclimation to a cold ambient temperature.
UR - http://www.scopus.com/inward/record.url?scp=0018583718&partnerID=8YFLogxK
U2 - 10.1016/0300-9629(79)90193-2
DO - 10.1016/0300-9629(79)90193-2
M3 - Article
AN - SCOPUS:0018583718
SN - 0300-9629
VL - 63
SP - 547
EP - 549
JO - Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology
JF - Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology
IS - 4
ER -