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Simple Summary: In the present study, the inclusion of micronised camelina, flax, and sunflower seeds in the diets of broiler chickens improved the slaughter parameters, for example, the share of commercial cuts in the carcass (breast, thigh, and drumstick muscle), and reduced the content of abdominal fat. The addition of oilseeds in the diets also modified the calorific value of the breast, thigh, and drumstick muscles as well as some organs by reducing the content of ether extract. In addition, the flax seeds increased the content of Ca, Cu, and Fe in the muscles and organs. At the same time, there were no abnormalities in the health status of the birds. In this study, we included 15% doses of infrared-irradiated camelina, flax, and sunflower seeds in the diets of broiler chickens (grower and finisher) and focused on assessing the effects on the production traits, selected slaughter analysis parameters, nutrients, and minerals in breast and drumstick meat and some organs, i.e., liver, proventriculus, and heart. In total, 200 one-day-old broiler chickens were assigned randomly to four treatments with five replicate cages of 10 broiler chickens per cage (five females and five males). The experiment lasted 6 weeks. In the group of broiler chickens in which diets were supplemented with micronised camelina and flax seeds, there was an increase in (p < 0.05) breast, thigh, and drumstick weight and a decrease (p < 0.05) in the abdominal fat of the carcasses. The oilseed treatments reduced the ether extract content and the calorific value in the breast and drumstick muscles and organs. The flax seeds contributed to an increase in the contents of Ca (breast muscle and liver), Cu (breast muscle and proventriculus), and Fe (drumstick muscle and heart). Likewise, some blood parameters were influenced by supplementation with infrared-irradiated camelina and flax seeds, for example, there was a decrease in the haemoglobin level and the mean corpuscular haemoglobin concentration (p < 0.05). The oilseed treatments also modified the contents of Fe and Ca in the blood plasma of broiler chickens (p < 0.05). It may be concluded that infrared-irradiated camelina, flax, and sunflower seeds can be regarded as good diet components exerting positive effects on the dietary value of poultry meat and organs used in dietetics. [ABSTRACT FROM AUTHOR]