Effect of the inclusion of soybean oil in the diet of dairy goats on meat fatty acid composition of their suckling kids
2007
Mele, M.; Serra, A.;La Comba, F.; Conte, G.; Secchiari, P., Università di Pisa (Italy). Dipartimento di Agronomia e Gestione dell'Agroecosistema, Sezione di Scienze Zootecniche | Buccioni, A., Università di Firenze (Italy). Dipartimento di Scienze Zootecniche
Ten lactating Saanen goats and their suckling kids were randomly assigned to two isonitrogenous diets: control diet (C) or soybean oil diet (SO) differing only by the inclusion of soybean oil in SO diet. At one month of age kids were slaughtered and from each one three muscle samples were collected: longissimus dorsi (LD), caput longum triceps brachii (CLOTB) and semimembranosus (SM). Lipids of milk and meat samples were extracted and analysed for fatty acid (FA) composition. Results showed that milk fat from goats fed the SO diet was richer in vaccenic acid and rumenic acid. With SO diet, also the other trans isomers of octadecenoic acid increased, included trans-10 C18:1, while saturated and medium chain fatty acid levels decreased. The intramuscular lipid content of kids fed SO milk resulted lower than that of kids fed C milk. The FA composition of intramuscular lipids of kids fed SO milk showed higher trans C18:1 and CLA isomers proportions, while lower levels of saturated FA, branched chain FA, oleic acid and n-3 unsaturated FA (UFA) as compared to that from kids fed C milk. The ratio between cis-9 monounsaturated FA and their tissue precursors in the delta 9 desaturation pathway was negatively affected by the SO milk, especially for the rumenic acid-vaccenic acid pair. The n-6-n-3 ratio in the intramuscular lipids of kids fed C milk resulted lower than that of kids fed SO milk
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