אסיף מאגר המחקר החקלאי

Thermoregulation in naked neck chickens subjected to different ambient temperatures

Year:

1998

Source of publication :

Authors :

Volume :

39

Co-Authors:

Yahav, S., Institute of Animal Science, Bet Dagan, Israel, Institute of Animal Science, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Luger, D., Institute of Animal Science, Bet Dagan, Israel
Cahaner, A., Hebrew University, Faculty of Agriculture, Rehovot, Israel
Dotan, M., Elbit Ltd., Inframetrics Israel Division, Haifa, Israel
Rusal, M., Institute of Animal Science, Bet Dagan, Israel
Hurwitz, S., Institute of Animal Science, Bet Dagan, Israel

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Abstract:

1. Heterozygous (Na/na) naked neck chickens and their normally feathered (na/na) sibs, were exposed to constant ambient temperatures (Ta) ranging between 15 and 35°C and 12h: 12h diurnal high:low temperatures of 15°C:35°C. 2. No significant effect of genotype was obtained in weight gain and food intake. However, the naked neck birds tended to gain somewhat more weight at high Ta and consume more food at low Ta. 3. At 35°C Na birds showed better regulation of body temperature (Tb) and demonstrated considerably higher radiation from the neck. 4. The greater food intake of the naked neck chickens at 15°C was associated with significantly higher packed cell volume, haemoglobin concentration, heart and liver size. These appear to involve both higher heat production and haemodynamic changes to accommodate the higher oxygen demands of the naked neck chickens at low Ta. 5. The results indicate the ability of the naked neck chickens, on the one hand to thermoregulate at low Tas and, on the other their slightly better capacity to maintain Tb at high Tas. However, no genotype advantage was obtained under diurnal cyclic temperature conditions.

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