Assessment of spatial variability of environmental variables of a typical house of laying hens in Colombia: Antioquia state Case
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Kuupäev
2020
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Abstrakt
This paper aimed to analyze the magnitude and spatial variability of environmental
variables: Temperature and Relative Humidity Index (THI), Radiant Thermal Load (RTL), Globe
Temperature and Relative Humidity Index (BGTH) and Enthalpy (H), inside a house for laying
hens, in the state of Antioquia (Colombia) during the month of August. A traditional Colombian
poultry house with natural ventilation was used. All variables were manually measured at equally
spaced 1.0×1.0 m points, totaling 99 data collection points inside the poultry house. Geostatistical
techniques were used through semivariogram analysis, and isochore maps were generated
through data interpolation by kriging. The semivariogram was fitted by the restricted maximum
likelihood method. The used mathematical model was the spherical one. After adjusting the
semivariograms, the data were interpolated by ordinary kriging. The semivariograms and the
isochore maps allowed identifying the non-uniformity of the spatial distribution of all evaluated
variables throughout the poultry house. The results show that THI, RTL, BGTH and, H presented
values above the comfort limits in the most significant part of the poultry house during the
observed period. It is possible to concluded that the use of natural ventilation alone was not
sufficient to guarantee the homeothermy conditions for the layers. Thus, it is suggested that in
addition to natural ventilation, secondary modifications should be used to improve farm
productivity.
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Märksõnad
animals production, animal welfare, natural ventilation, articles