Dietary fibre has long been considered an unimportant feed component, but it has been shown that especially insoluble dietary fibre (nPV) can play an important role in digestion. The aim of the study was to determine the effect of different concentrations of ground wood (ML) as a source of nPV and feeding strategies on growth performance, as well as on the balance and utilisation of nutrients and energy in broiler chickens. The experiment was carried out on 120 male chickens of the Ross 308 provenance, of which 48 chickens were included in the balance trial in four groups. The chickens received feed without nPV, with 0.8% or 20% ML, where ML replaced part of the basal feed mixture, while the V20/0% group received 20% ML until 26 days of age and then control feed. We determined the balance and utilisation of dry matter (SS), crude protein (SB), crude fat (SM), crude fibre (SV), crude ash (SP), gross energy (BE) and minerals (Ca, P, Mg, K, Na, Fe, Zn, Mn, Cu). The results showed that different concentrations of nPV had no effect on average daily gain, while the V0% and V20/0% groups achieved higher final body weight than the V0,8% and V20% groups. A low concentration of nPV (V0,8%) had no effect on the balance of SS, SB, SV, SP and BE, while a high concentration of nPV (V20%) reduced the apparent balance of SM and the utilisation of SS, SM and BE, but had no effect on the utilisation of SB, SV and SP. Regarding minerals, different concentrations of nPV and feeding strategies had no effect on the utilisation of Ca, P, Mg, Zn, Mn and K. The addition of 20% ML positively affected the utilisation of Fe, while the addition of 0.8% ML and the feeding regime affected the utilisation of Cu, whereas both nPV concentrations impaired the utilisation of Na. We conclude that the addition of 0.8% ML had no negative effects. The use of 20% ML in broiler nutrition was not beneficial, while the feeding strategy partially mitigated these negative effects.
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