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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

The thermoneutral temperature zone and seasonal acclimatisation in the hen.

1. Oxygen consumption, body temperature, respiratory frequency and respiratory water loss of White Leghorn x Rhode Island hens were measured for short periods at six air temperatures between 2 and 32 degrees C. The hens were kept between tests in an open shed. The experiments were carried out over 3 years. 2. The upper critical temperature (Tcu) was estimated by the air temperature at which: 1, respiratory frequency increased above 60 respirations/min and 2, body temperature increased by 0.3 degrees C above that at the lower critical temperature. These responses to the test temperatures were examined as a function of the acclimatisation temperature (Ta) represented by the mean daily temperature during experimental periods. 3. A seasonal change in Tcu was observed, which correlated with Ta(r = 0.836). The seasonal 10 degrees C change in the Ta brought about a 3 degrees C change in Tcu, compared with an 8.5 degrees C change in the lower critical temperature. 4. Thermoneutral temperature zone decreased with increasing Ta; the two critical temperatures tended to merge at a Ta of 32 degrees C. The latter probably represents an upper limit for acclimatisation to heat.[1]

References

  1. The thermoneutral temperature zone and seasonal acclimatisation in the hen. Arieli, A., Meltzer, A., Berman, A. Br. Poult. Sci. (1980) [Pubmed]
 
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