Document Type

Conference Proceeding

Conference

2003 ASAE Annual International Meeting

Publication Date

7-2003

City

Las Vegas, NV

Abstract

A temperature-humidity-velocity index (THVI) for male broilers (46 ± 3 d; 2.8 ± 0.1 kg; Ross × Ross breed) was established based on body temperature (tb) rise of the bird during acute exposure to 18 thermally challenging conditions. The thermal conditions consisted of 18 factorial combinations of 3 dry-bulb air temperature (tdb, 35, 38, and 41 oC), 2 dew-point temperature (tdp, 19.4 and 26.1 oC), and 3 velocity (V, 0.2, 0.7, and 1.2 m/s). The THVI has the form of 058 . 0 ) 15 . 0 85 . 0 ( - × × + × = V t t THVI wb db (where twb = wet-bulb temperature). Homeostasis state of the bird was classified as normal, alert, danger, or emergency that corresponds to a tb rise threshold of 1.0, 2.5, 4.0 or >4.0 oC. These different homeostasis states are functionally and graphically expressed in terms of THVI and exposure time. The results of this study provide a scientific basis for making management decisions and risk assessment associated with marketsize broiler production and handling under adverse thermal conditions.

Comments

This is an ASAE Meeting Presentation, Paper No. 034037.

Copyright Owner

American Society of Agricultural Engineers

Language

en

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