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The growing interest in cultivation and the introduction of legume seeds into animal and poultry diets has been observed in recent years. It was shown that biologically active legume proteins, rich in lysine, have antioxidant properties (Nalle et al., 2011; Smulikowska et al., 2013; Kaczmarek et al. 2014; Hejdysz et al. 2015, 2016a,b; Rutkowski et al., 2015, 2017). Antioxidants (such as selenium and vitamin E) and microelements (Zn, Cu, Mn) supporting the immune system are among other beneficial components of legume seeds (Wasilewko and Buraczewska, 1999; Lampart-Szczapa and Łoza, 2007). Antinutritional factors present in seeds such as protease inhibitors, alkaloids, α-galactosides and tannins limit inclusion levels of legume seeds in diets, especially for young, growing animals (Smulikowska et al., 1999; Laudadio and Tufarelli, 2011b). ABSTRACT. In the first study conducted to investigate the nutritional value of raw and extruded narrow-leafed lupin (Lupinus angustifolius) seeds cv. Boruta, 60 male Ross 308 chickens of age 16–20 days were used (Experiment 1). In 35-day performance trial (Experiment 2), 960 1-day-old chickens were randomly allotted to 11 treatments and fed diets containing 0, 50, 100, 200, 250 or 300 g · kg−1 diet of raw or extruded narrow-leafed lupin seeds. In the first experiment, extrusion of narrow-leafed lupin seeds led to the decrease of neutral detergent fibre (NDF) concentration. Seed processing increased fat digestibility and nitrogen retention in chickens but had no effect on ileal digestibility of protein and amino acids. There was a tendency to increase the apparent metabolizable energy corrected to zero N balance (AMEN) after lupin extrusion. In the second experiment, the inclusion of increasing levels of raw or extruded seeds into diets quadratically decreased body weight gains (BWGs) of birds, except for broilers fed extruded lupin on days 15–35. The extrusion increased the BWGs of birds in the whole trial period (days 0–35). Increasing levels of raw and extruded narrow-leafed lupin seeds quadratically increased feed conversion ratio during the experiment. So, the extrusion of narrow-leafed lupin seeds had a limited positive effect on the chemical composition of seeds and growth performance of broiler chickens. Received: 29 August 2017 Revised: 20 November 2017 Accepted: 1 February 2018

journal of animal and feed sciences

Effect of increasing levels of raw and extruded narrow-leafed lupin seeds in broiler diet on performance parameters, nutrient digestibility and AME&lt;sub&gt;N&lt;/sub&gt; value of diet