Composição centesimal, perfil de ácidos graxos e colesterol da carne de cordeiros submetidos aos sistemas de produção com dieta experimental e convencional

Abstract

This research aimed to evaluate the centesimal composition (moisture, gross protein, fat and mineral matter), the profile of fatty acids (saturated, monounsaturated and polyunsaturated) and the cholesterol of lamb meat from the crossing of breeds Santa Inês x Dorper handled in the Campomar Farm and subjected to production systems with Experimental and Conventional diet. We used six lambs from the crossing of Santa Inês x Dorper with experimental diet and 6 without experimental diet, uncastrated male, recently weaned with 15 kg of body weight according to completely randomized design with two treatments and six repetitions. Comparisons of the contrasts between treatment averages were made by the Tukey test at 5% and the analysis of variance according to procedures of SAS (1996). The experimental diet provided to the animals was composed of 100% concentrate in the diet consisting of grain corn + pelleted supplement, sodium chloride, calcium carbonate, dicalcium phosphate and vitamin and mineral supplements, mak ing isoproteic (17% of PB) and isoenergetic (2.95 Mcal/kg of MS of metabolizable energy) diets, according to NRC (2006), while in the conventional diet, the animals were fed large (50%) and concentrate (50%) corn, wheat and soybeans. In the centesimal comp osition of the palette of lambs subjected to experimental and conventional production systems, only the mineral matter was influenced (P<0.05) with lower value in the experimental system (1.09%) compared to the conventional (1.43%). For the parameters moisture, gross protein and fat and cholesterol (P>0.05) there was no effect of treatments. It was observed that the 33 saturated and monounsaturated fatty acids were not affected (P> 0.05) by the treatments, however, the polyunsaturated fatty acid C18:2 (linole ic) was higher (4.72%) in the meat of lambs from the experimental system compared to (3.72%) observed in the meat of lambs reared in the conventional system. The palette of lambs subjected to experimental production and conventional systems, was similar on centesimal composition (exception mineral matter), no significant differences in two treatments studied, the fatty acid profile and cholesterol (with the exception of linoleic acid) in the two treatments evaluated in the palette.