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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 2008;21(9): 1271-1277.
DOI: https://doi.org/10.5713/ajas.2008.80046    Published online September 3, 2008.
Effects of Soybean Oil or Rumen Protected Conjugated Linoleic Acid Supplementation on Accumulation of Conjugated Linoleic Acid in Dairy Cows’ Milk
Wisitiporn Suksombat*, Khukhuan Chullanandana
Correspondence:  Wisitiporn Suksombat,
Abstract
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45 days in milk, 15.62.43 kg of milk and 45251 kg 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 <C16:0 fatty acids but increased C18:0 and CLA concentration in milk fat.
Keywords: Conjugated Linoleic Acid; Rumen-protected Conjugated Linoleic Acid; Soybean Oil; Fatty Acid; Milk Production and Composition


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