In each feeding cycle individual cows were fed alternatively according
to one of the following three variants: (1) without fat supplementation (control – C
diet), (2) with the addition of fish oil (POLTRAN s.c. Kuslin Poland) with rapeseed
oil (ADM SZAMOTUŁY sp. z. o.o. Wielkopolskie Zakłady Tłuszczowe Poland. Ltd.)
blend 1 : 1 (FR diet) and (3) supplemented with commercial protected Bergafat fat T