Effect of Dietary Rapeseed Meal on Fatty Acid Profile of Lamb Carcass

Document Type: Research Article

Author

Department of Animal Nutrition and Feed Technologies, Institute of Animal Science, 2232, Kostinbrod, Bulgaria

Abstract

The objectives of this study were to determine the effects of feeding rapeseed (27%, DM basis) and sunflower biodiesel by-products as protein supplements on fatty acid composition (FA), profile (ratios and indices),enzyme activitiesfrom thecarcassin lambs fed cereal-based diets. Simultaneously, itwas examined the relationship between ingested FA and carcass FA. Samples were obtaine dfrommal efattened lambs (n=10, Bulgarian synthetic dairy population, 146-daged, final body weight FBW= 36.95±0.91 kg) involved attwoiso-caloric, iso-nitrogenous and equalin calcium: phosphorus (Ca:P) ratio dietary treatments: control–with sunflower meal (SFD) and experimental–with rapeseed meal (RSD). Lipids,extracted from carcasswere analyzed for FA profile. Animals feeding RSDhad significantly higher (P<0.01) performance (FBW=38.80 vs. 35.1 kg) and meat yield (5.26 vs. 4.67 kg). RSDincreased C18:3 (P<0.01) and C18:3 / CLA (P<0.05), butdecreased (P<0.01) C18:2 / C18:3 ratio compared with SFD. Deduced relationships between ingested dietary FA and carcassFA showsgood parity and high correlation (R>0.55). In conclusion, animals feeding RSD, as a method to modify carcassFAs, decreased the amount of saturated and polyunsaturated FA, and increased monounsaturated, total unsaturated and desirable FAs of carcass.

Keywords


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