In two experiments with lactating dairy cows, the responses in milk and linoleic acid production were monitored after feeding diets containing different types of formaldehyde-treated sunflower seed supplements (FT-SS). In the first experiment, nine Friesian-cross cows in early lactation were fed rations of whole FT-SS, decorticated FT-SS, and decorticated FT-SS with soybean meal, with the main aim of determining whether decortication of the oil seed or substitution of soybean meal for some of the casein in the supplement affected the levels of linoleic acid in milk fat. In the second experiment, nine Jersey cows in early lactation were also fed rations of decorticated FT-SS and decorticated FT-SS with soybean meal at levels of 2.5 kg per cow per day, and a control ration of oats at 3.5 kg/cow/day. Neither the decortication of sunflower seed nor the substitution of soybean meal for casein resulted in any significant difference in the production of milk constituents.
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