Digestibility and nutritive value of activated sludge in the pig diet
1991
Adamec, T. | Koucky, M. (Vyzkumny Ustav Zivocisne Vyroby, Prague-Uhrineves (CSFR))
Biologically activated sludge from a sewage treatment plant of a meat processing plant was tested as a potential feed source. This biosludge had a high content of nutrients with high variability (g/kg): 428.1 crude protein, 96.45 fat, 47.88 fibre, 117.11 ash. The biosludge had a high acid value of fat - 99.8 mg KOH/g fat, not depending on fat content. In metabolism and growth trials, the biosludge replaced soybean meal at 1:1 ratio as an isonitrogenous source as 3 per cent, 6 per cent and 9 per cent replacement in feed mixtures of type A1 and A2 administered to pigs fattened to the liveweight of 65 kg (in the animals fattened to the liveweight of 120 kg the finishing of all groups was without the use of biosludge). Crude protein digestibility in the biosludge feed mixtures was found to range from 98.71 to 112.0 per cent of the level of control mixtures without biosludge (i.e. from 76.09 to 80.03 per cent). In the growth experiments the production efficiency, in dependence on the daily weight gains in individual stages of fattening, made 76.91 to 105.90 per cent of the level of control groups (from 644 to 695 g over the whole fattening period, the differences being significant in the first stage of fattening). The feed intake per unit production was influenced in a similar way: from 76.0 to 115.4 per cent (i.e. from 3.59 to 3.79 kg).
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