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This experiment was conducted to study the effect of a prolonged hot period on the fatty acid (FA) composition in blood serum of dairy cows. Eighteen multiparous Holstein cows were randomly assigned to the hyperthermia group (HYP, n = 8) in August (summer season) and the control group (CON, n = 10) in October (autumn season). Blood from animals of the HYP group was collected in one heat wave, which was preceded by a long period of heat stress (HS, temperature-humidity index (THI ≥ 72)). Blood from cows of the CON group was collected under thermal comfort conditions (THI < 68). The spectrum of free fatty acids (FFA) in the blood serum was analyzed by gas chromatography. The concentration of FFA increased, including saturated FAs and monounsaturated FAs, in the blood serum of cows under conditions of prolonged HS. This was associated with the mobilization of FA into the bloodstream from adipose tissue, as a consequence of negative energy balance. An increase in the ratio of n-6/n-3 polyunsaturated FAs may indicate biomembrane dysfunction and adversely affect dairy cows. This study showed that prolonged periods of heat can affect the FA composition of blood. How much this leads to changes in the FA composition of milk and the quality of food products remains to be seen in further research.

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The study aimed to investigate the effect of the drug “Bendamine” on dogs' clinical and morphological parameters in heart failure. Two groups of dogs were formed for research: control (healthy) and experimental (sick). The 30-day experiment included ten dogs from the control group, ten dogs of the observed (unhealthy) spaniel breed, and 10–12 years old dogs. The treatment regimen for sick dogs: furosemide was administered orally on an empty stomach at 2 mg/kg every 12 hours; enalapril was administered orally at 0.5 mg/kg every 12 hours; Bendamine was administered orally on an empty stomach at 20 mg/kg every 24 hours. It is recommended to divide the dose into two doses. In the study of hematopoiesis, we found that erythrocytes in dogs with heart failure increased by 18.2 %, while hemoglobin levels decreased by 1.8 %. Before treatment, red blood cell counts were found to reduce the mean hemoglobin in the erythrocyte and the mean erythrocyte volume. In the experimental group of dogs treated with the “Bendamine”, normalization of morphological blood parameters was found. The number of erythrocytes was 5.8 ± 0.06 T/L, and the hemoglobin level was 143.5 ± 4.7 g/L. The use of the drug “Bendamine” contributed to the gradual restoration of the functional state of the hematopoietic system in dogs with heart failure. This is also indicated by the red blood cell index of the dogs after the course of treatment. The therapy application in the experimental group significantly reduced the frequency and severity of shortness of breath and increased endurance during exercise. There was also a decrease in the frequency and duration of cough attacks. After treatment, signs, and intensity of ascites decreased in dogs of the experimental group. It has been suggested that this is due to an increase in myocardial contractile function due to the positive ionotropic action of Bendamine. The owners also recorded an improvement in appetite in animals after 30 days of therapy. Even in the dogs of the experimental group, after treatment, physical activity and emotional reactions improved. They were less depressed and more inclined to communicate with the owners. Thus, the use of the cardiac drug “Bendamine” in dogs with heart failure positively affected the restoration of hematopoiesis and the normalization of morphological parameters of the blood.

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