The effects of dry extrusion of rapeseed with other feedstuffs upon its nutritional value and anti‐thyroid activity

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Abstract
The effects of dry extrusion of mixtures of high‐glucosinolate rapeseed (cv. Jet Neuf) with barley, sunflower meal and rapeseed meal and a mixture of low‐glucosinolate rapeseed (Canola) and sunflower meal upon dry matter intake, utilisation of protein, liveweight gain and anti‐thyroid activity in rats, measured in terms of plasma thyroxine and tri‐iodothyronine, were studied in comparison with equivalent milled mixtures. Extrusion of the Jet Neuf mixtures increased dry matter intake, liveweight gain and biological value of the protein but only for the Jet Neuf/barley and Jet Neuf/sunflower mixtures did extrusion reduce the anti‐thyroid activity. Extrusion of the Canola mixture had no effect on the biological value or anti‐thyroid activity; in both respects it was superior to the Jet Neuf mixt–res.