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Twenty-four Polish Landrace pigs (12 gilts and 12 barrows) fattened from 30 to 95 kg body weight were fed diets containing 18% rapeseed meal ( R S M ) and full-fat rape seeds (RS) in the following amounts: 0 (group RS-0), 10 (group RS-10) or 20% (group RS-20). The pigs were fed on an individual basis w i th rations having equal energy, protein and lysine contents. Ni t rogen balance was determined at 40, 60 and 80 kg liveweight. Metabolizable energy and protein ut i l izat ion were determined by the slaughter technique. The thyro id gland, liver and kidneys were weighed and plasma T 3 and T 4 levels assayed. Ni t rogen retention was on average 12 and 17% lower ( P < 0.01) in groups RS-10 and RS-20 than in RS-0; the negative effect o f rape seeds on nitrogen uti l izat ion intensified as fattening progressed. Metabolizable energy uti l izat ion in pigs receiving 20% RS was 2.5 and 3.4% worse (P <0.05) than in groups RS-10 and RS-0, respectively. As glucosinolates intake increased, the weight o f the internal organs rose and T 3 and T 4 levels declined. These changes were not, however, proport ional to the amount o f glucosinolates intake. The combined use o f R S M and RS in the diets o f growing pigs had an unfavourable effect on protein and energy uti l izat ion. K E Y W O R D S : pig, nitrogen retention, energy metabolism, glucosinolate, internal organs, thyro id

The efficiency of energy and protein utilization by growing pigs fed diets containing both full-fat rape seeds and rapeseed meal