Influence of feather cover on heat balance in laying hens (Gallus domesticus)

  • Nichelmann M
  • Baranyiová E
  • Goll; R
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Abstract

1. 1.|The maximum thermoregulatory increase in heat production (HP) of defeathered laying hens exceeded that of the feathered ones at thermoneutral temperatures by 238%. 2. 2.|The HP of laying hens is an appropriate physiological parameter to calculate the total effective ambient temperature (Ta). 3. 3.|The cold sensitivity of the thermoregulatory system in laying hens was determined by three different methods (a) from the relationships between Taand HP in well feathered birds in the range 5 to 25°C; (b) fromm the relationships between Taand HP in defeathered hens in range 20 to 40°C; (c) from the relationships between Taand HP in the total effective ambient temperature range (EAT1)(-15 to -18°C) and was found to be about -3,2 W kg-1. © 1986.

Author-supplied keywords

  • Bird
  • Gallus domesticus
  • colonic temperature
  • heat production
  • thermoregulation
  • total body thermosensitivity
  • total effective ambient temperature

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Authors

  • M. Nichelmann

  • E. Baranyiová

  • R. Goll;

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