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Abstract: Thirty male Merinizzata italiana lambs were divided into three groups after weaning according to live weight. The diet of the three groups differed in the main protein source used in the concentrate, soybean meal for treatment SBM, faba bean for treatment FB and peas for treatment PEA. Lambs were fed ad libitum and slaughtered at about 160days of age. Meat from the PEA group had higher proportions of the essential fatty acids C18:2 ω-6 and C18:3 ω-3 than from FB and SBM lambs and consequently its derivatives, C20:4 ω-6 and C20:5 ω-3 respectively, were higher in meat from PEA animals, compared to SBM and FB ones. The total n-3 fatty acids were highest in meat from PEA lambs and consequently PEA lambs showed a more favourable n-6/n-3 ratio. In conclusion the use of legume seeds such as peas in lamb diets positively affected intramuscular fatty acid composition. [ABSTRACT FROM AUTHOR]

Abstract: Forty male Italian Merino lambs were used to study the effects of four feeding systems on muscle fatty acids composition: S group—ten lambs were kept indoors, and fed with concentrate for all experimental period (89days); P group—ten lambs were allowed to graze a pasture for all experimental period; PS37 group—ten lambs were allowed to graze a pasture for 52days and shifted indoor, fed with concentrate, 37days before slaughtered; PS14 group, where 10 lambs were fed on pasture for 75days and shifted indoor, fed with concentrate, 14days before slaughtered. Grazing lowered the levels of C12:0, C14:0, C16:0 and n-6 PUFA and increased n-3 PUFA and CLA isomer compared to concentrate feeding. After a short period of indoor finishing with concentrate, the fatty acid characteristics of the meat retain a part of the benefits occurring from grazing, while a longer period seems to erase almost all the benefits from grazing. [Copyright &y& Elsevier]