Effects of including a ruminally protected lipid supplement in the diet on the fatty acid composition of beef muscle

Nigel D. Scollan, Mike Enser, Suresh Gulati, R. Ian Richardson, Jeff D. Wood

Research output: Contribution to journalArticlepeer-review

82 Citations (SciVal)

Abstract

Enhancing the polyunsaturated fatty acid (PUFA) and decreasing the saturated fatty acid content of beef is an important target in terms of improving the nutritional value of this food for the consumer. The present study examined the effects of feeding a ruminally protected lipid supplement (PLS) rich in PUFA on the fatty acid composition of longissimus thoracis muscle and associated subcutaneous adipose tissue. Animals were fed ad libitum on grass silage plus one of three concentrate treatments in which the lipid source was either Megalac (rich in palmitic acid; 16:0) or PLS (soyabean, linseed and sunflower-seed oils resulting in an 18:2n−6:18:3n−3 value of 2·4:1). Treatment 1 contained 100g Megalac/kg (Mega, control); treatment 2 (PLS1) contained 54g Megalac/kg with 500g PLS/d fed separately; treatment 3 (PLS2) contained no Megalac and 1000g PLS/d fed separately. The PLS was considered as part of the overall concentrate allocation per d in maintaining an overall forage:concentrate value of 60:40 on a DM basis. Total dietary fat was formulated to be 0·07 of DM of which 0·04 was the test oil. Total intramuscular fatty acids (mg/100g muscle) were decreased by 0·31 when feeding PLS2 compared with Mega (P
Original languageEnglish
Pages (from-to)709-716
Number of pages8
JournalBritish Journal of Nutrition
Volume90
Issue number3
DOIs
Publication statusPublished - 18 Sept 2003

Keywords

  • beef
  • rumen
  • fatty acids
  • healthy eating

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