Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(6), 161-166 | DOI: 10.11118/actaun201159060161

Effect of average diurnal barn airspace temperatures on prediction of their development during the day

Gustav Chládek1, Oto Hanuš2, Daniel Falta1
1 Ústav chovu a šlechtění zvířat, Mendelova univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika
2 Agrovýzkum Rapotín, Výzkumný ústav pro chov skotu, Výzkumníků 267, 788 13 Vikýřovice, Česká republika

A year-round (i.e. 365 days) experiment was performed at the Mendel University Training Farm in Žabčice, Czech Republic (GPS 49°0'51.967"N and 16°36'14.614"E, the altitude 179 m) with the aim to quantify the effect of the variation of average diurnal barn airspace temperatures on prediction of their changes during the day. Barn airspace temperatures were monitored daily in one-hour intervals and the recorded values were used for calculations of average diurnal temperatures. These were classified into 7 categories (i.e. below 0 °C; 0.1 to 5 °C; 5.1 to 10 °C; 10.1 to 15 °C; 15.1 to 20 °C; 20.1 to 25 °C and above 25 °C). Regarding this classification system, all differences between temperatures measured at identical hours but within various limits were statistically highly significant. The statistical analysis involved also the calculation of the third degree polynomial regression equations, which enabled to characterise the relationship between the temperature and the hour of measurement within the aforementioned categories of diurnal temperatures. Individual equations were markedly different and ranged from y = - 0.0019x3 + 0.0596x2 - 0.3797x - 1.2169 (for temperatures below 0 °C) to y = - 0.0108x3 + 0.3297x2 - 1.9367x + 24.3931 (for temperatures above 25 °C). Correlation coefficients (r) and coefficients of determination (R2) of these regression equations were generally very high and ranged from 0.872 to 0.976 and from 0.760 to 0.953, respectively. Regarding high values of both coefficients it can be concluded that the calculated equations enable a good and reliable prediction of the diurnal development of barn airspace temperatures.

Keywords: barn airspace temperature, prediction, heat stress, regression equations
Grants and funding:

This study was supported by the Research plan No. MSM6215648905 "Biological and technological aspects of sustainability of controlled ecosystems and their adaptability to climate change", which was financed by the Ministry of Education, Youth and Sports of the Czech Republic, and projects MSM 2678846201 and Kontakt ME 09081.

Received: July 29, 2011; Published: March 16, 2014  Show citation

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Chládek, G., Hanuš, O., & Falta, D. (2011). Effect of average diurnal barn airspace temperatures on prediction of their development during the day. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 59(6), 161-166. doi: 10.11118/actaun201159060161
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