These changes are now universally recommended by dieticians.
In practice of dairy cow feeding, fat-rich additives cannot exceed certain critical level
because of their possible negative effect on the activity of rumen microorganisms.
During summer feeding of dairy cows, fresh green forage allows to reach relatively
high level of unsaturated fatty acids of milk including CLA isomers [Lock and
Garnsworthy 2003]. However, because of limited forage resources at the disposal
for ruminant feeding, attempts are being made to find another methods of altering
the fatty acid profile in dairy products