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In this experiment the effect of the extensive diet (grass/grass silage and concentrate linseed supplemented)versus intensive diet (maize silage and concentrate) on the amino acid composition and mineral content ofHungarian Grey and Hungarian Holstein Friesian young bulls was analysed. In addition the relationshipsbetween fatty acid profile and amino acid composition as well as mineral content of longissimus muscle wereinvestigated. The extensive diet caused some changes in the proportion of some amino acids includingisoleucine, leucine, phenylalanine, threonine, valine, cysteine, glycine, proline, serine and ammonia. The breedinfluenced only the histidine concentration of longissimus muscle. In extensive groups arginine to glycine andarginine to leucine ratios were higher compared to intensive fed bulls. The mineral composition of longissimusmuscle was mainly influenced by diet and there was a breed x diet interaction, whereas breed differences weredetected for calcium (Ca) and sodium (Na). The phosphorus (P) and the iron (Fe) content in longissimus muscleof extensively fed animals were significantly higher, whereas Na and copper (Cu) content were lower. The beefof Hungarian Grey bulls contained less Ca and Na compared to Holstein counterparts. Cysteine and leucineconcentration were positively correlated to intramuscular fat content and negatively with n-3 and n-6 fatty acids(FA). Among minerals the P and Fe content correlated negatively to intramuscular fat content. The closestcorrelations were determined between P and linolenic acid (C18:3n-3) as well as n</i.-3 fatty acids (r=0.81). Thelower n-6 and n-3 fatty acid ratio in extensive groups occured simultaneously with higher proline, valine,phenylalanine, P, and with lower glycine, cystine, leucine and sodium proportion in longissimus muscle

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Effect of feeding on the composition of longissmus muscle of Hungarian Grey and Holstein Friesian bulls. – III. Amino acid composition and mineral content