Production of carbon dioxide in a fattening pig house under field conditions. I. Exhalation by pigs |
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| Institution: | 1. Hangzhou Rural Energy Office, 16 Hanghai Road, Hangzhou 310016, People''s Republic of China;2. Laboratory for Agricultural Buildings Research, Catholic University of Leuven, K. Mercierlaan 92, B-3001 Leuven, Belgium;3. Laboratory for Analytical and Inorganic Chemistry, Catholic University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium;1. Wageningen UR Livestock Research, P.O. Box 338, 6700 AH Wageningen, the Netherlands;2. Farm Technology Group, Wageningen University, P.O. Box 16, 6700 AA, Wageningen, the Netherlands;1. Research group Air Quality Engineering, Department of Engineering, Aarhus University, Hangøvej 2, 8200 Aarhus N, Denmark;2. Research group EnVOC, Department of Sustainable Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, 9000 Ghent, Belgium;1. Flanders Institute for Agriculture, Fisheries and Food Research (ILVO), Burgemeester van Gansberghelaan 115 bus 1, 9820 Merelbeke, Belgium;2. Department of Animal Sciences and Aquatic Ecology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium;3. Department of Electromechanical, Systems and Metal Engineering, Ghent University, Technologiepark Zwijnaarde 131, 9052 Zwijnaarde, Belgium;5. Livestock & Environment, Wageningen Livestock Research, Wageningen University and Research, PO Box 338, 6700 AH Wageningen, the Netherlands;1. Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907, USA;2. Chinese Research Academy of Environmental Sciences, Chaoyang District, Beijing 100012, China |
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| Abstract: | Exhalation of carbon dioxide (CO2) by pigs was investigated under field conditions in a mechanically ventilated commercial fattening house. The tranquil CO2 exhalation rate (TCER) by pigs was defined and methodology was developed to study it. The experiments were conducted by moving groups of pigs in and out of one of the compartments in the house and comparing differences of measured CO2 production rates. The measured TCERs ranged from 41.5 to 73.9 g CO2 h?1 per pig for pigs from 32 to 105 kg. When pigs were very active, the CO2 exhalation rate could be about 200% of the TCER but did not last for long time. A TCER mathematical model was developed based on 4 sets of experiments. It calculated the CO2 exhalation by a pig at tranquil time as a function of its weight. Daily mean CO2 exhalation rate (CER) by a pig was about 110% of the TCER. The TCER/CER model related the CO2 exhalation to some aspects of pigs’ behaviours and was the first reported model developed with direct measurement of CO2 production rates. Five models of CO2 exhalation in available literature were reviewed and the CER model was compared with them. There was a clear disparity among these models. The average CO2 exhalation rate calculated with the “Ouwerkerk Model” was about three times as that obtained by the “Anderson Model” for pigs from 35 to 120 kg. The CER model produced the same CO2 exhalation rate as the “Ouwerkerk Model” for a pig of 35 kg and a close rate to the “Klooster Model” for a pig of 85 kg. |
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