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Influence of lupins and canola supplement on short loin fatty acid profiles within genetically divergent first cross merino lambs


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Bignell, CW, Nichols, PD and Malau-Aduli, AEO 2009 , 'Influence of lupins and canola supplement on short loin fatty acid profiles within genetically divergent first cross merino lambs', paper presented at the World Congress on Oils and Fats & 28th ISF Congress, 27-30 September 2009, Sydney Convention & Exhibition Centre, Australia.

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Australian consumers are becoming increasingly aware of the health benefits of long-chain omega-3 polyunsaturated fatty acids [LC-PUFA] - eicosapentanoic acid (EPA), 20:5(n-3) and docosahexanoic acid (DHA), 22:6(n-3). The most common dietary source of long-chain omega-3 is through consumption of seafood and fish oil supplements. Common Australian commercial crops of canola and lupin both offer good sources of LC-PUFA precursors,including -linolenic acid [ALA, 18:3(n-3)] and their potential as animal feeds to manipulate LC-PUFA concentrations within animal meat is of great interest to the livestock and human health sectors.

This study investigated the LC-PUFA profiles of 38 first cross Merino weaner lambs sired by five genetically divergent rams supplemented with canola meal or cracked lupins at 1% or 2% of body weight feeding levels for 60 days. Results demonstrated that all animals had ‘source’
content of omega-3 (EPA+DHA) in muscle samples taken from the short loin (loin chop) equal to or greater than 30mg per 100g serve. 18 animals were in excess of ‘good source’ content of 60mg per 100g serve with a whole flock mean of 67mg/100g EPA+DHA. When docosapentaenoic acid (DPA) is added to EPA+DHA, only two animals do not reach the
‘good source’ content of long-chain omega-3. Supplement type significantly (P<0.05) affected the level of ALA, with canola meal-supplemented sheep producing 91mg/100g compared to 66mg/100g in lupin-fed sheep. Total saturated fatty acid levels also showed a significant (P<0.05) interaction with sex and supplement indicating that males fed lupins had the lowest levels of SFA 3860mg/100g compared to males fed canola which had 5180mg/100g SFA.
Overall the mean long-chain omega-3 content (mg) per 100g for each breed was: East Friesian 75 mg/100g, Dorset 73 mg/100g, Coopworth 68 mg/100g, Texel 59 mg/100g and
White Suffolk 58 mg/100g.

In conclusion feed supplementation markedly enhanced long-chain omega-3 content of Australian lamb. Level of supplementation, breed and type of supplement had no significant relationship with short loin content of long-chain omega-3 FA. However, when supplementing wethers and ewes with canola meal or lupins, attention should be paid to the significant interactions that exist between sexes and supplement type.

Item Type: Conference or Workshop Item (Paper)
Authors/Creators:Bignell, CW and Nichols, PD and Malau-Aduli, AEO
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