Heat and moisture production of w‐36 laying hens at 24°c to 27°c temperature conditions
Résumé
This study was conducted to quantify heat and moisture production (HMP) of W-36 laying hens in their prime laying phase (27 to 33 weeks of age) using four large-scale indirect animal calorimeters. Two experiments were conducted involving two groups of hens. The hens were exposed to conditions of 24 degrees C to 27 degrees C and concomitant relative humidity (RH) of 45% to 65% for six weeks. In each experiment, a total of 216 laying hens were used, with 54 hens housed in each of the four calorimeters at the cage stocking density of 435 cm(2) hen(-1) (67 in.(2) hen(-1)) that was typical of industry practice. Total heat production (THP), room-level latent heat production (LHP), and room-level sensible heat production (SHP) were expressed as daily time-weighted average (TWA), with an average of 16 h light and 8 h dark. The results showed that HMP was similar for the 24 degrees C to 27 degrees C temperature range. THP, LHT; and SHP, in W kg(-1) (mean +/- SE) were, respectively, 6.1 +/- 0.3, 2.3 +/- 0.2, and 3.8 +/- 0.1 for the daily TWA; 6.5 +/- 0.3, 2.4 +/- 0.2, and 4.1 +/- 0.1 for the light period; and 5.4 +/- 0.3, 2.2 +/- 0.2 and 3.2 +/- 0.1 for the dark period. The HMP data contribute to the design and operation of ventilation systems in modern laying hen housing.
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