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Carcass Characteristics, Chemical Composition and Fatty Acid Profile of Longissimus Muscle of Bulls and Steers Finished in a Pasture System Bulls and Steers Finished in Pasture Systems

  • Aricetti, Juliana Aparecida (Bachelor in Chemistry, Department of Chemistry, State University of Maringa) ;
  • Rotta, Polyana Pizzi (Undergraduate student, Animal Science Department, State University of Maringa) ;
  • do Prado, Rodolpho Martin (Undergraduate student, Animal Science Department, State University of Maringa) ;
  • Perotto, Daniel (IAPAR. Agronomic Institute of Parana) ;
  • Moletta, Jose Luiz (APAR. Agronomic Institute of Parana) ;
  • Matsushita, Makoto (Graduate Chemistry Program, State University of Maringa) ;
  • do Prado, Ivanor Nunes (Graduate and Undergraduate studies in Animal Science, State University of Maringa)
  • Received : 2008.01.23
  • Accepted : 2008.03.28
  • Published : 2008.10.01

Abstract

This experiment was carried out to study the carcass characteristics, chemical composition and fatty acid profile of the Longissimus muscle (LM) of bulls (10) and steers (17) finished in a pasture system. Animals (1/2 Zebu vs. 1/2 Aberdeen Angus) were fed in a pasture system (Hermatria altissima) and with a supplement of soybean meal, cracked corn, urea, limestone and mineral salts, twice a day. Both animal groups were slaughtered at 27 months of age, with an average 508.88 kg of live weight. Final weight, hot carcass weight and texture were similar (p>0.05) between bulls and steers. Carcass dressing, fat thickness, color and marbling were higher (p<0.02) in steers. Conversely, the Longissimus area was greater (p<0.05) in bulls. Moisture levels were higher (p<0.01) in bulls. Ash, crude protein, total lipids and total cholesterol levels were higher (p<0.10) in steers. C14:0, C16:0, C16:1 n-7 and C18:1 n-9 fatty acids percentages were higher (p<0.06) in steers. C16-1 n-10, i 17:0, C19:0, C18:2 n-6, C18:3 n-3, C20:2 n-3 C20:4 n-6, C20:5 n-3, C22:1 n-7, C22:4 n-6 and C22:5 n-3 fatty acids percentages were higher (p<0.05) in bulls. The percentage of the other fatty acids was similar (p>0.05) in bulls and steers. The levels of monounsaturated fatty acids were higher (p<0.02) in steers while polyunsaturated fatty acids, n-3, n-6, PUFA/SFA and n6:n3 ratios, were higher (p<0.05) in bulls. The CLA contents (mg/g lipids) were similar (p>0.10) in bulls and steers.

Keywords

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