Nutrient losses (N, P, K) in dairy- and pig production
2002
Kaasik, A. | Leming, R. | Remmel, T. (Academical Agricultural Society, Tartu (Estonia))
Losses excreta and manure nutrients (N, P, K) ex animal, ex building and ex storage were studied in different animal categories and keeping systems. Dairy cows with milk yield 5000 and 7000 kg per year, heifers 12-24 months and calves 0-6 months were kept in tying system where manure was scraped out twice a day. Bullocks 12-24 months were grouped in loose housing system with solid floor where manure was removed out by tractor once a week. Fattening pigs, weaners and dry and pregnant sows were kept in group pens and lactating sows were kept individually (manure was scraped out twice a day). Sawdust was used as bedding material in all animal categories except bullocks where a mixture of straw and peat was used. The nutrient content and amount of excreta per year (dairy cows, heifers and bullocks) or per period (calves and pigs) depending on the amount and composition of feed was investigated. The effect of feed nitrogen content and amount of bedding material on the dynamics of nitrogen (ammonia) emission in the building was studied. Quantitative and qualitative changes of cattle manure were studied in uncovered and non-leaking manure storage
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Эту запись предоставил Estonian University of Life Sciences