The aim of this study was to review research papers with gas emission data from livestock buildings that were published between 1997 and 2015. The review focused on three gases: NH 3 , N 2 O and CH 4 and two animal species: pigs and dairy cows. The results of the review are presented in different units, which makes it difficult to compare the data. For this purpose, the gas emission factors were converted to 1 LU (livestock unit = 500 kg).
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Rzeźnik et al. (2016) studied this question.
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