DIETARY INFLUENCES ON BOVINE-MILK CIS-9,TRANS-11-CONJUGATED LINOLEIC-ACID CONTENT

The effects of grass dry matter (DM) allowance and dietary supplements of full fat rapeseeds on levels of cis-9,trans-11 octadecadienoic (CL A) acid in bovine milk were investigated. Grass allowance of 16 kg/(co wday) resulted in reduced (p<0.05) milk fat CLA levels (3.91 mg CLA/g fat) compared to 20 kg/(cowday) after 19 wk treatment. CLA levels in creased in milk fat from cows on a high-rapeseed-supplemented diet (p< 0.001) (1650 g/(cowday) full fat rapeseed) compared to the control (p asture) and low rapeseed (p<0.01) (825 g/(cowday) full fat rapeseed) supplemented diets. The variation in milk fat CLA levels among individ ual cows over both trials was 1.5-16 mg/g.