Sodium monensin or propolis extract in the diet of Nellore bulls finished in feedlot: chemical composition and fatty acid profile of Longissimus muscle

Resumo

This work was carried out to evaluate the chemical composition and fatty acid profile of Longissimus muscle of 33 Nellore bulls with 27 months old and initial average weight of 402 ± 7.58 kg finished in feedlot. Three treatments (Control – CON, Monensin – MON and Propolis extract – PRO) were evaluated. The animals were kept in feedlot during 84 days and slaughtered with final average weight with 488 ± 24.9 kg. The addition of additives (monensin or propolis extract) did not influence (P > 0.10) the chemical composition of Longissimus muscle of bulls. Saturated fatty acid (SFA) did not have difference (P > 0.10) among treatments. Monounsaturated fatty acids (MUFA) have difference (P < 0.01) among treatments. The highest value was observed in CON treatment (47.0%). There is also difference (P < 0.01) among treatments for polyunsaturated fatty acids (PUFA). Bulls of MON (9.92%) treatment obtained highest (P < 0.01) value for PUFA. Bulls of CON (6.74%) and PRO (6.93%) have lowest (P < 0.01) values for PUFA.