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The following supplements were used in the feeding of high yielding dairy cows starting 3 weeks before calving to day 100 of lactation: a fat supplement in the form of calcium-magnesium soaps, Erafet, (group I) , Erafet plus rapeseed meal (group II ) , rapeseed cake containing 19.5% crude fat (group I I I ) . During the first three months of lactation, a increase in the daily FCM yield was noted in the experimental groups as compared with the control group with no supplements, i.e. by 4.6, 11.6 and 8.5 %, respectively in groups I I I I . After withdrawing supplementation, during the subsequent four months of lactation, the cows in the experimental groups produced 1.7, 3.3 and 4.1 % more milk, respectively, than the controls. The milk fat from experimental cows contained significantly more oleic (by 7.5 to 10.0%) and stearic acids (from 5.9 to 25.1%) and less C4-C16 acids.

Effects of supplemental fat for high yielding dairy cows at first stage of lactation on milk yield and composition