Heat loss in one day old pullets inside a hatchery

Engenharia Agrícola

Irenilza De A. Nääs²  Daniela E. Graciano²  Rodrigo G. Garcia²  Mayara R. De Santana²  Diego P. Neves¹ 

[1] ,UFGD Faculdade de Ciências Agrárias Dourados MS ,Brasil

关键词: sensible heat;    post-hatching;    infrared thermography;    calor sensível;    pós-eclosão;    termografia infravermelho;   

DOI  :  10.1590/S0100-69162014000400001

来源: SciELO

【 摘 要 】

After hatching, pullets are transported to brooding area and vaccinated. One day old chicks have not already developed thermoregulation ability; thus, brooding temperature variations may affect pullet quality leading to broiler meat production losses. This research aimed to calculate sensible heat loss in one day old pullets in hatching area and vaccination room. Ten one day old pullets were randomly selected from hatching area of a commercial hatchery. Infrared images were used to calculate bird surface temperature. Exposure areas for the two conditions were quantified, and both air temperature and wind speed was recorded. Total sensible heat loss was calculated as heat loss by radiation plus heat loss by convection. It was found that heat transfer occurs in different ways at different bird body parts. Total heat loss found for hatching baskets was equivalent to 0.81 J s-1 while for vaccination room was 1.16 J s-1. Pullet nutrition is based on energy loss from brooding to farm, and the overall pullet heat loss from hatchery to farm accepted is 13.95 J s-1. Thus, "starter feed" has relevant excess of energy input. These findings indicate that less energy can be used in initial feed, once heat loss is lower than assumed nowadays. Improved knowledge on these conditions may enhance broiler farm feeding strategies and economics during first rearing week.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License