Fatty Acid Profile of Meat from Lambs Fed on Diets Containing Mulberry Hay

Authors: A. G. Silva Sobrinho, L. G. A. Cirne, V. T. Santana

Abstract:

The aim of this trial was to evaluate fatty acid profile of meat from lambs fed on diets containing 0, 12.5 and 25.0% mulberry hay as a substitute for the concentrate. Twenty-four feedlot Ile de France lambs (average weight of 15kg and average age of 60 days) were randomized to receive the different diets and slaughtered at 32kg body weight. Increases were observed in the concentrations of the saturated pentadecanoic, heptadecanoic and arachidic fatty acids; of the monounsaturated nervonic fatty acid and of the polyunsaturated α-linolenic, ɣ-linolenic and eicosapentaenoic fatty acids. Increased conjugated linoleic acid (CLA) was also found in the meat of lambs fed on 12.5% mulberry hay. In addition, the omega-3 composition was augmented, while the omega-3/omega-6 ratio was decreased in mulberry hay-fed animals. In conclusion, a more desirable fatty acid profile was observed in lamb meat following the substitution of mulberry hay in the concentrate of fed, resulting in improved nutritional characteristics of the meat.

Keywords: Alternative food, fatty acids, feedlot, sheep meat.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1092433

References:

[1] V. Banskalieva, T. Sahlu, A. L. Goetsch, "Fatty acid composition of goat muscles and fat depots: A review,” Small Ruminant Research, Amsterdam, v. 37, n. 3, pp.255-268, 2000.
[2] J. F. Hocquette, F. Gondret, E. Baéza, F. Meédale, C. Jurie, D. W. Pethick, "Intramuscular fat content in meat-producing animals: Development, genetic and nutritional control, and identification of putative markers,” Animal, Cambridge, v. 4, n. 2, pp.303-319, 2010.
[3] National Research Council – NRC, Nutrients requirements of sheep, Washington: National Academies Press, 2007. 362 p.
[4] E. G. Bligh, W. J. Dyer, "A rapid method of total lipid extraction and purification,” Canadian Journal of Biochemistry and Physiology, Ottawa, v. 37, n. 8, pp. 911-917, 1959.
[5] International Organization for Standardization – ISO, Animal and vegetable fats and oils – Preparation of methyl esters of fatty acids, Method ISO 5509, 1978. pp.1-6.
[6] M. R. G. Maia, L. C. Chaudhary, L. Figueres, R. J. Wallace, "Metabolismo of polyunsaturated fatty acids and their toxicity to the microflora of the rumen,” Antonie Leeuwenhoek, Amsterdam, v. 91, pp. 303-314, 2007.
[7] B. Mulvihill, "Ruminant meat as a source of conjugated linoleic acid (CLA),” British Nutrition Foundation Nutrition Bulletin, London, v. 26, n. 4, pp. 295-299, 2001.
[8] A. P. Simopoulos, "Omega-6/Omega-3 Essential Fatty Acid Ratio and Chronic Diseases,” Asia Pacific Journal of Clinical Nutrition, v. 20, pp. 77-90, 2004.