Resumen

GLORIA TRUJILLO, Adrian et al. Animal performance and fatty acids levels in lambs carcass suplemented with Saccharomyces cerevisiae. Ecosistemas y recur. agropecuarios [online]. 2014, vol.1, n.2, pp.87-96. ISSN 2007-901X.

Saturated fatty acids (FA) in the carcass of ruminants represent a critical topic in human alimentation given by their relationship with cardiovascular diseases. In view of this, Saccharomyces cerevisiae (Sc) represents an alternative to modify the meat FA profile by increasing the ratio of deposited unsaturated FA, because of its high levels of unsaturated fatty acids. An experiment was carried out using 30 commercial growing lambs (20 ± 0.9 kg LW), distributed into three groups with 10 animals each, which was placed into one of three evaluated treatments: 0, 3, and 5g Sc animal^-1 d^-1, in order to determine the productive performance of the animals, plasmatic cholesterol levels, and FA deposited in the carcass. A totally random design was used. Data were analyzed using the PROC GLM, considering ten repetitions per treatment. Mean comparison of the treatments was done through the Tukey test. The results show that adding 3g animal^-1 d^-1 Sc partially decreased (p < 0.05) DM intake and food conversion in the evaluated periods without affecting (P > 0.05) daily weight gain. It also did not affect (p > 0.05) muscle area of the Longissimus dorsi, fat thickness and total cholesterol in the blood. As the Sc dose increased, the levels of myristic, palmitic, oleic, and linoleic acids decreased (p < 0.05). Sc doesnt affect the animal performance, neither improvement the carcass unsaturated FA profile, however, saturated FA concentrations decreases.

Palabras llave : Saccharomyces cerevisiae; lambs; oleic; carcass; fat thickness.

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