Resumen
El objetivo fue identificar los efectos de la complementación con aceites de atún (AA) o linaza (AL) sobre el comportamiento productivo y el perfil de ácidos grasos en Longissimus thoracis, Gluteous maximus y Musculus deltoides de L. thoracis de corderos Rambouillet. Cincuenta animales fueron estratificados por edad y peso vivo (PV= 31.10 ± 1.14). Cada estrato (n = 10) recibió durante 35 días alguno de cinco tratamientos: 1) Dieta completa de sorgo-soya (Control, C); 2) C+1.0 % AA, 01AA; 3) C+3.0 % 03AA; 4) C+1.0 % AL, 01AL; y 5) C+3.0 %, 03AL. Los corderos tratados con 03AA mostraron ganancias diarias de peso mayores que los tratados con C, 03AL, 03AA y 01AA (330 vs 320, 306, 304 y 288 g·d-1, respectivamente). En L. thoracis, la grasa muscular (GM) fue mayor con 03AL en comparación con otros tratamientos y no hubo efectos (P > 0.05) en miristico. En G. maximus, la GM fue mayor en 03AL, y no se afectaron miristico y palmitico. En M. deltoides la GM fue mayor en C. En contraste, no se afectaron los niveles de estearico, linoleico, linoleico y araquidonico. En conclusión, la complementación con aceite de linaza al 3.0 % mejoró la ganancia diaria de peso, la grasa muscular, la concentración de ácido palmítico y la relación n-6/n-3 en L. thoracis. Este nivel de suplementación también aumentó la concentración de ácidos esteárico, araquidónico, y la relación n-6/n-3 en G. maximus. La complementación con 1.0 % de aceite de atún mejoró la concentración de ácido esteárico y n-6/n-3 en G. maximus y mejoró los niveles de esteárico y palmítico en M. deltoides.
Citas
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