Manipulating of the Carcass and Meat Quality in Lamb Meat Producing for the European Market.
II. Fatty Acid Composition of Fat Depots of Lambs Grown under Two Different Production Systems

1 Institute of Animal Science, BG-2232 Kostinbrod, Bulgaria
2 INRA, Center de Recherches de Clermont-Theix, France


BANSKALIEVA, V., P. MARINOVA, G. MONIN, T. POPOVA and M. IGNATOVA, 2005. Manipulating of the carcass and meat quality in lamb meat producing for the European Market. II. Fatty acid composition of fat depots of lambs, grown under two different production systems. Bulg. J. Agric. Sci., 11: 603-610

A study with 20 male lambs of local Zapadnostaroplaninska sheep breed was carried out at the Institute of Animal Science _ Kostinbrod. After weaning, at age of 75 days, half of the animals were allowed to graze natural pasture, and additionally received concentrates of 250g/d/animal. The other 10 lambs were grown indoors with ad libitum access to a diet of commercial concentrate, and hay. At age of 135 days the animals of both groups were slaughtered and samples of three internal (perirenal, caul, sweetbread) and a subcutaneous fat depots were taken for lipid analysis.
In both production systems the fatty acid composition of reserve adipose tissues varied in a depot-specific way. Relatively more 18:0 and less - 18:1 fatty acids in the internal fat depots and a higher level in the subcutaneous fat depots were found. The triacylglycerols of the four studied depots in extensive grown animals were more saturated, but contained relatively more linolenic (18:3n-3) fatty acid, with a better 18:2n-6/18:3n-3 ratio, than in indoors grown lambs. On the other hand, the higher amounts of reserve lipids of intensive raised animals contained more 18:0, 18:1 and 18:2n-6 fatty acids, and less of so called "dangerous" 14:0 and 16:0 fatty acids. The results obtained suggest that the fatty acid profile of carcass fat could be manipulated using an appropriate production system, but it is a question of decision which one or a combination should be chosen.

Key words: lambs, pasture, concentrate, fat depots, fatty acids