USE OF SOYBEAN AND SUNFLOWER MEAL AND SUN FLOWER SEED AS A PROTEIN-SOURCE FOR MILKING COWS

In a feeding trial with 37 cows of Brown Swiss the impact of 10% soybe an meal (Soja), 16% sunflower meal (Soblex) and 30% sunflower seed (So blsa) in the feeding stuff on dry matter intake, milk yield, milk ingr edients and also on the conditions of milk fat was investigated. Soybe an meal and sunflower meal are similar protein sources for cows. Sunfl ower seeds caused a lower dry matter intake, milk yield and content of milk protein, but showed positive effects on the consistency of butte rfat. Butterfat of the sunflower seed group had a higher iodine value (P<0.01) and a higher content of trans fatty acids (P<0.01) than the S oja- and Soblex-groups and resembled the composition of butterfat in t he grazing periode.