Trials of peroral vaccination of newborn pigs against transmissible gastroenteritis (TGE)

: A year-round study was carried out by seasons at a swine breeding complex for 3,500 fattened pigs. It was found that the concentration of dry matter in the compost is influenced by the way of cleaning in summer and autumn. It was found to be higher in autumn and winter. In winter and spring the device retaining the deposited sediment captured 15-20 per cent of the dry matter, about 32 per cent nitrate nitrogen, 20-44 per cent organic matter, 2-12 per cent ammonia nitrogen, and 3-20 per cent phosphates. In summer and autumn the deposited sediment contained 3-10 per cent dry matter, 3-31 per cent nitrate nitrogen, 2-5 per cent ammonia nitrogen, and 6-10 per cent organic matter. The amount of organisms in the air on the premises varied within a wide range, in TP-6 type building it being 2.5 X 10(6), on an average, and in BC-70 type buildings--1.4 X 10(6) per 1 m3. The choice of building spots should be associated with considerations concerning the amount and type of wastes.