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We know that the silkworms consume leaves in large quantities. The scope of the research was their reaction to various additives for their food. Mulberry leaves spray-coated in several dietary supplements were administered starting with the 5th day of the 3rd instar. The substances used were flax (linseed) oil, hemp oil and 2.5% fat cow’s milk. The research was performed on four different silkworm hybrid strands. Each hybrid was separated in 4 lots, a control group and one for each of the three supplements. The preliminary conclusions of the research were that the best results were obtained with the 2.5% milk supplement, where we observed the highest individual mass and silk quantity compared to the other lots.