Effects of olive cake, citrus pulp and wheat straw silage on milk fatty acid composition of Comisana ewes
2007
Caparra, P. ; Foti, F.; Scerra, M.; Postorino, S.; Vottari, G.; Cilione, C.; Scerra, V.; Sinatra, M.C., Università Mediterranea di Reggio Calabria (Italy). Dipartimento di Scienze e Tecnologie Agro-forestali e Ambientali
Thirty-six lactating Comisana ewes were divided into three homogeneous groups (grass, G; silage 100, S100; and silage 50, S50). Group G grazed pasture during daytime and received hay plus concentrate on the stall. The other groups were fed a mixed-diet containing silage (30 per cent crude olive cake, 65 per cent orange pulp, 5 per cent wheat straw), hay and concentrate. Silages differed in the stone removal of olive cake (100 per cent in S100 and 50 per cent in S50). The trial lasted 70 days preceded by a 21-day adaptation period. Every 14 days individual milk samples were collected and analysed.In milk from S100 and S50, C18:0, C18:1t9, C18:1c9, C18:1t11, C18:2 plus minus 9-c12, C20:0 and C20:3n6 fatty acids increased significantly, while C6:0, C8:0, C10:0, C11:0, C12:0, C13:0, C14:0, C14:1, C15:0, C16:0, C18:2c10-t12, C18:2c9-t11 (CLA) and C18:3n3 fatty acids decreased in comparison to G group. This determined a decrease of the C6-C11 and C12-C17 fatty acids, an increase in UFA, in particular MUFA, and an improvement of the UFA-SFA ratio in S100 and S50 groups. n-6 PUFA was significantly higher in S100 and S50 than in G group, while n-3 PUFA was significantly higher in group G. n-6-n-3 PUFA ratio was significantly higher in S100 and S50
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