Dietary Influences on Bovine Milk <i>cis</i> ‐9, <i>trans</i> ‐11‐Conjugated Linoleic Acid Content

Abstract

ABSTRACT The effects of grass dry matter (DM) allowance and dietary supplements of full fat rapeseeds on levels of cis ‐9, trans ‐11 octadecadienoic (CLA) acid in bovine milk were investigated. Grass allowance of 16 kg/(cow*day) resulted in reduced (p&lt;0.05) milk fat CLA levels (3.91 mg CLA/g fat) compared to 20 kg/(cow*day) after 19 wk treatment. CLA levels increased in milk fat from cows on a high‐rapeseed‐supplemented diet (p&lt;0.001) (1650 g/(cow*day) full fat rapeseed) compared to the control (pasture) and low rapeseed (p&lt;0.01) (825 g/(cow*day) full fat rapeseed) supplemented diets. The variation in milk fat CLA levels among individual cows over both trials was 1.5–16 mg/g.