Emission of materials of biological origin in laying hens houses with different technologies of rearing
2006
Vaicionis, G. | Ribikauskas, V. | Benediktaviciute-Kiskiene, A. | Skurdeniene, I.
The aim of this study was to determine the conversion of nutrients (N, P, K) into the production of eggs and to determine the emission of N, air pollution by dust and microorganisms in accordance with different technologies of layer rearing. The studies were conducted in 6 poultry houses. Laying hens were kept in cage batteries BKN-3, Spech, OBN-1, OBN-3 or on littered floor. There was 1.6 times more dust in the air and the total number of bacteria was 2.4 times higher when laying hens were kept on litter than in cages (P less than 0.001). The hens assimilated 21.95-28.42% of N, 19.63-31.25% of P, 6.04-8.33% of K for egg production and weight gains when feed was balanced. N losses in excrements were 6.7+/-1.4% in cage technologies and 18.5+/-4.8% (P less than 0.025) on littered floors. When the birds were kept in cages, 0.059+/-0.011 kg of N per each bird evaporated because of ammonia emission, while in the case of littered floor, it was 0.227+/-0.126 kg of N.
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