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Fatty acid composition of lamb meat as affected by production system, weaning and sex = Vpliv tehnologije reje, odstavitve in spola na maščobno kislinsko sestavo mesa jagnjet jezersko-solčavske pasme
Fatty acid composition in intramuscular fat of Longissimus dorsi (LD) of 32 Jezersko-Solčava lambs was measured in two kinds of production system (grazing on mountain pasture and fattening in stable ...with hay and cereals ad libitum) and two kinds of weaning system (suckling and weaned) and interaction between them. The effect of sex was also determined. Pasture and stable lambs were slaughtered at average live weight 34 kg. Suckling lambs were slaughtered at 125 days of age (30 kg of live weight) and weaned lambs were slaughtered at 165 days (38 kg of live weight). Lambs on pasture displayed lower percentage of palmitic (C16:0) and oleic (C18:1n-9) and higher percentage of linoleic (C18:2n-6), alfa-linolenic (C18:3n-3), arachidonic (C20:4n-6) and eicosapentaenoic (C20:5n-3) fatty acids. Pasture lambs had lower percentage of SFA (saturated fatty acids) and MUFA (monounsaturated fatty acids), higher percentage of PUFA (polyunsaturated fatty acids) and especially relatively high percentage of C18:3n-3 (3.3%) in intramuscular fat. Pasture lambs also had higher percentage of n-6 PUFA (15.06%), even 1.5 times higher than stable lambs (9.34%) and consecutivelz higher n-6/n-3 PUFA ratio (2.1 vs. 1.6). Above all weaning affected MUFA and PUFA. Intramuscular fat of suckling lambs contained less MUFA (34.84% vs. 38.35%) and more PUFA (21.89% vs. 17.08%) as well as higher n-6/n-3 ratio than weaned lambs (1.9 vs.1.7). The interaction between production system and weaning was statistically significant only for alfa-linolenic acid, with the highest proportion in LD fat of weaned lambs grazing on pasture (3.48%) and the lowest proportion of weaned lambs fatten in stable (2.71%). Males had lower values of MUFA and higher values of PUFA, n-6 PUFA and n-3 PUFA. The n-6/n-3 PUFA ratio was the same in both sexes (1.8).
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