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The aim of this study was to evaluate the effect of dietary supplementation with sunflower oil (0, 2 and 4% of the dry matter), on forage consumption, production, composition, concentration of milk fatty acids and on the cost-benefit ratio, in a tropical dairy farm where animals grazed Star grass (Cynodon plectostachyus). Nine cows were used with more than 2 births and between 70-110 days in milk. A Latin square design overshift, 3x3 (periods of 21 days) was used, each treatment was repeated 3 times. In the 0% treatment, no oil supplementation was offered. The cows supplemented with levels 2 and 4% of sunflower oil (63.32% linoleic acid and 28.32% oleic acid) received 250 and 500 g oil / animal / day, respectively. Forage intake, milk production and composition were not affected (P>0.05) by treatments. The proportion of c9t11 conjugated linoleic acid (CLA-c9t11) in milk tended (P=0.0799) to increase, transvaccenic and oleic acids increased linearly with both levels of supplementation and C12:0, C14:0 and C16:0 atherogenic fatty acids decreased (P<0.05), obtaining a milk with higher amount of unsaturated fatty acids and lower atherogenic index which provides benefits to human health. The benefit-cost ratio would be higher at the level of supplementation of 2%, if the milk is marketed with a diferencial value of c9t11 CLA content.

Suplementación con aceite de girasol sobre ácidos grasos de la leche en una lechería tropical