The study was carried out to investigate the effects of feeding sufflower oil protected from ruminal hydrogenation by encapsulation with formaldehyde-treated casein to cows (exp. 1) and fattening steers (exp. 2). In exp. 1, three Holstein cows, milking about 15kg per day, were fed twice daily the ration composed of 4kg timothy hay, 8kg beet pulp and 5-6kg customary concentrate feed. Cows were treated in the following order: 1) standard period, 2) encapsulated sufflower oil (CSO)-feeding period (at 100g per day), 3) non-treating period, 4) CSO-feeding period (at 300g per day), 5) non-treating period and 6) CSO-feeding period (at 600g per day).Fatty acid compositions of milk fat and plasma lipid were measured on the last day of each period consisting of five days. Results are summarized as follows:1. There was a tendency for increased linoleic acid content in plasma lipid with the increase in the amount of CSO included in the ration.2. Blood glucose increased with increasing CSO. 3. Linoleic acid content of milk also increased from almost negligible value in the standard period to 21.6%
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