The objective of the experiment was to define if in ovo injection of acetylsalicylic acid (ASA) during the final stage of embryogenesis has an effect on morphotic parameters and heart work of chicken embryos subjected to hyperthermia. Eggs (n=420) from a broiler breeder flock were incubated under standard conditions. On the 18th d of incubation, they were injected with 5 mg of ASA/50 µl of 0.9% NaCI and subsequently incubated during the hatching period under control (T=37.2°C) and hyperthermic (T=38.5°C) conditions. The cardiac function in the embryos was measured every day at the same time using contactless ballistocardiography. After hatching, the hearts were collected from randomly selected embryos or one-day old chicks to determine heart weight, relative heart weight, and ventricle wall thickness. It was shown that hyperthermia during the final stage of embryogenesis accelerated heart rate, inhibited its development, and reduced chicken hatchability. The injection of ASA on the 18th d of incubation in the group of embryos exposed to hyperthermia caused the heart rate to decrease to near optimum values. The administration of ASA also limited a decrease in heart weight and ventricle wall thickness, and improved chicken hatchability.
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