Abstract
ABSTRACTThe content, composition and distribution of intramuscular lipids in M. longissimus dorsi (LD) of pure bred Hampshire, Swedish Landrace and Swedish Yorkshire pigs were investigated.The highest content of intramuscular lipids was found in Hampshire (2.0%). Swedish Yorkshire had on an average 1.8% intramuscular lipids and Swedish Landrace 1.4%. About 35% of the fatty acids are saturated, 51–56% are monounsaturated and 8–12% are polyunsaturated. The content, as well as the fatty acid composition of the intramuscular lipids, were influenced by breed and sex and most probably also by genetic factors.The intramuscular lipids were mainly found in fat depots containing 20 to 150 fat cells. The fat depots were situated in the perimysium and, to some extent, in the endomysium. The fat cells had mostly an elliptical shape. The diameter of the fat cells varied between 15 and 180 μm but a diameter of 30–60 μm was most frequently noted. An increase in fat depot size was related to an increase in fat cell diameter.For the Swedish Landrace breed a relationship between the sensory properties of LD and the content and the distribution of intramuscular lipids was noted. The sensory properties of Yorkshire were related to the content, composition and distribution of intramuscular lipids, whereas no relationship was noted for the Hampshire breed.
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