Dietary supplementation of extruded linseed and calcium soap for augmenting meat attributes and fatty acid profile of longissimus thoracis muscle and adipose tissue in finisher Malpura lambs

摘要

Present study aimed meat production augmented with conjugated linoleic acid (CLA), essential fatty acids and polyunsaturated fatty acids (PUFA) by supplementation of linseed and Ca-soap in wearier lamb diets. Thirty-six, 3 month old Malpura lambs were randomly divided into three dietary treatments comprising of Control, linseed (10 % crushed linseed) and Ca-soap (5 % Ca-soap), fed for 90 days and slaughtered at 6 months of age to determine chemical composition and fatty acid profile of carcass. All the lambs received a basal diet of ad lib. pala (Ziziphus nwnularia) leaves and respective concentrate mixtures formulated as per the dietary treatments. Hot carcass weight (kg), total fat (%), cooking loss (%) and water holding capacity (%) remained similar (P > 0.05) among the treatment groups. Feeding of Ca-soap reduced (P < 0.05) total saturated fatty acid (SFA) and enhanced (P < 0.05) total monounsaturated fatty acid (MUFA) content in longissimus thoracis (LT) muscle fat than linseed and control groups. Moreover, the ratio of n-6/n-3 values was lower (P < 0.05) in both Ca-soap and linseed group than control but the atherogenic index (AI) was lower only in Ca-soap group. The amount of C18:2 c9 t11 CLA in LT muscle was highest (P < 0.05) in linseed group followed by Ca-soap and control group. Likewise, in adipose tissue the proportion of PUFA, n-3 fatty acids was higher (P < 0.05) in linseed group whereas, MUFA and TI (thrombogenic index) was increased (P < 0.05) in Ca-soap fed group. Similarly, the proportion of C18:2 c9t11 CLA in adipose tissue showed similar trend like LT muscle and highest (P < 0.05) value was observed in linseed fed lambs. These findings indicate that inclusion of Ca-soap and linseed in the diet of finisher lambs resulted in enhanced content of desirable fatty acids in both LT muscle and adipose tissue. Therefore, adding Ca-soap and crushed linseed in diets can be a promising option for modifying fatty acid make-up of finisher lambs and provide better nutritional quality meat to consumers.