Effect of feeding and lactation length on vitamin E content and fatty acid composition in longissimus dorsi of light lambs | Influencia de la alimentación y de la lactancia sobre el contenido en vitamina E y ácidos grasos de la carne de corderos ligeros
2011
Joy, M., Centro de Investigación y Tecnología Agroalimentaria de Aragón, Zaragoza (España) | Molino, F., Centro de Investigación y Tecnología Agroalimentaria de Aragón, Zaragoza (España) | Gil, C., Centro de Investigación y Tecnología Agroalimentaria de Aragón, Zaragoza (España) | Estopañán, G., Centro de Investigación y Tecnología Agroalimentaria de Aragón, Zaragoza (España) | Álvarez Rodríguez, J., Universitat de Lleida (España) | Blanco, M., Institut National de la Recherche Agronomique (Francia)
This study determined whether the vitamin E and fatty acid profile content of L. dorsi may reflect the feeding strategy in light lambs (22-24 kg). Thirty-two single Rasa Aragonesa lambs were assigned to one of four treatments in a 2 x 2 factorial design. The factors were the inclusion of forage in the diet (alfalfa grazing vs. concentrate-fed indoors) and lactation length (weaning at 13 kg vs. suckling until slaughter). The effect of the inclusion of forage in the diet was significant on alpha-tocopherol and gamma-tocopherol contents and on FA profile while the effect of weaning was less clear. Lambs from grazing treatments presented greater contents of alpha-tocopherol and MUFA, CLA and lower ã-tocopherol and PUFA n-6/n-3 (P<0.05), regardless of weaning status. Weaning did not have effect on vitamin E contents (P>0.05), whereas increased the PUFA (P<0.05) and decreased SFA and CLA contents (P<0.05). Grazing dams and their lambs affected positively alpha-tocopherol and gamma- tocopherol contents and improved the FA profile of intramuscular fat from a human health of point of view.
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