The objective of the research study was to assess the effect of feeding broiler chickens with fodder with and without flax seeds added on the selected quality factors of poultry meat and fat. The experimental material consisted of Ross 308 broiler chickens. The chickens were randomly divided into two groups. The one group was fed with the fodder without shot flax seeds added and the other group with the fodder without this additive. The assessment of poultry raw material included: body weight gains of the chickens in the control and experimental groups after the completed rearing; slaughter analysis; pH value of the femoral and pectoral muscles; profile of discoloration parameters of the pectoral muscle and thigh of chickens using a CIE L* a* b* system; determination of the basic chemical ingredients, such as: water, proteins, fats, minerals in the form of ash and collagen, assessment of the nutritional value based on the lipid profile of breast and thigh muscles and of skins, and subcutaneous and abdominal fat. Based on the results of the experiments performed, it was found that the flax seeds used to feed broiler chickens affected neither the increase in the weight gain nor the increase in the breast and thigh muscle weight of carcass. It was found that feeding with flax seeds affected the increase in the protein content and the reduction in the fat content in the breast and femoral muscles. It was reported that the application of fodder with crushed flax seeds to feed broiler chickens had a beneficial effect on the nutritional value of raw material and on the lipid profile improvement, especially on the higher KT content from the n-3 PUFA group and the PUFA n-6/PUFA n-3 ratio was twice more beneficial. The chicken meat enriched with the n-3 fatty acids can be recommended as a source that enriches the diet of people with those acids, i.e. as a functional food.