Effects of Soybean Oil or Rumen Protected Conjugated Linoleic Acid Supplementation on Accumulation of Conjugated Linoleic Acid in Dairy Cows' Milk

  • Suksombat, Wisitiporn (School of Animal Production Technology, Institute of Agricultural Technology, Suranaree University of Technology, University Avenue) ;
  • Chullanandana, Khukbuan (School of Animal Production Technology, Institute of Agricultural Technology, Suranaree University of Technology, University Avenue)
  • Received : 2008.01.20
  • Accepted : 2008.03.28
  • Published : 2008.09.01


The effects of feeding soybean oil (SBO) or rumen protected conjugated linoleic acid (RP-CLA) on CLA accumulation in milk, and performance of lactating dairy cows were studied. Twenty four Holstein Friesian crossbred lactating dairy cows, averaging $126{\pm}45days$ in milk, $15.6{\pm}2.43kg$ of milk and $452{\pm}51kg$ body weight were stratified randomly and assigned in a randomized complete block design (RCBD) to three treatments of 8 cows each. The treatments were control, 150 g of SBO and 150 g of RP-CLA supplementation. Performance parameters showed that DM intake, NELP intake and body weight change were similar across treatments, while CP intake was decreased by SBO and RP-CLA supplementation. Milk yield and milk composition were not significantly different among treatments, except for milk fat percentage and fat yield which were significantly decreased by 27% (p<0.05) and by 28% (p<0.01), respectively, by RP-CLA supplements compared with control treatment. Feeding RP-CLA reduced 3.5% FCM compared with the other treatments (p<0.003). Both SBO and RP-CLA supplementation reduced ${\geq}C18:0$ and CLA concentration in milk fat.



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