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Abstract
1. Two experiments are reported in which a total of 1020 broiler chicks was used to examine the heating effect of microwave radiation.
2. In experiment 1, the effects of exposure time and age of birds were studied. In experiment 2, the influence of body mass and the effect of multiple exposures were explored.
3. In the first experiment, microwave treatment caused the birds’ body temperature to rise significantly only at 0, 1 and 2 weeks of age. Body temperature increased linearly with exposure time.
4. Signs of thermal stress were evident during exposure for 80 or 100s up to the age of two weeks.
5. The heating effect of microwaves in the second experiment decreased as the total irradiated body mass increased. For the same body mass, however, the heating effect was greater at the younger age.
6. The effect of using multiple exposures in experiment 2 was additive and varied with the age and body mass of the birds.
7. A model for the heating effect of microwave radiation is discussed which takes into account all the factors studied.
Notes
Present address: Lehrstuhl für Tierzucht, Institut für Tierwissenschaften, Technischen Univer‐sitat Munchen, 8050 Freising‐Weihenstephan, FRG.