Spirulina platensis is a microalga with biological activity used to produce nutritional supplements rich in proteins, essential fatty acids, vitamins, and minerals. The current study aims to prove the impact of the product ZooBioR2 (obtained from Spirulina platensis) on health, and on the histology of duodenum, jejunum, ileum, and cecum in laying hens. The experiment was performed in duplicate on 5 groups of hens (14 birds/group), one control and four experimental, in which the feed was supplemented with ZooBioR2 in different doses (5.0; 10.0; 15.0; 20.0mg active substance/kg of fodder). Inclusion of the supplement in the diet have determined a significant decrease of height of intestinal villi, the depth of the crypts and the thickness of muscular layer of mucosa in the experimental groups receiving 15.0 and 20.0mg/kg. The decrease of crypts depth is an indicator of a higher rate of turn-over of epithelial tissue. The morphological changes of intestinal mucosa could be involved in a better digestibility of the fodder.

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At present, the positive effect of BioR remedy obtained by original technologies from the biomass of cyanobacterium Spirulina platensis was demonstrated at the Academy of Sciences of the Republic of Moldova on pigs, rabbits and broilers. Considering the fact that remedies of vegetal origin are not harmful to animals, people and environment, they are of particular interest to the most developed branch of animal husbandry – the aviculture, including for the production and exploitation of quail. Until present, studies on the action of the nominated preparation on the physiological-metabolic status, including lipid metabolism in quail for reconditioning have not been conducted. The biological material was 150 quail at the end of the laying cycle divided into 3 batches of 50 birds. The tested preparation was administered intramuscularly to the quails two times consecutively at the onset of the study and secondly at 14 days after the first administration at a dose of 0,5 ml /head. In another experimental batch, the commercial product Butofan was administered in order to compare the obtained results. Birds of the control group received 0,5 ml of solution of NaCl of 0,9 % in both terms. The birds included in the study were analogous in terms of race, age, body weight and physiological status. During all time of the study, quails were monitored: clinical parameters, body weight, and number of eggs. In addition, for laboratory investigations, blood was collected from five quails at the start of the study before the tested preparations were administered and then 2 times during the study. It has been established that the tested remedies do not cause adverse reactions or deviations in quails' health. Moreover, BioR showed adaptive properties, reflected in body temperature lower by 0,32 C than the control group and 0,18 C than the group treated with Butofan. Similar manifestations were also found in birds' breathing. Biochemical researches performed on quails that have benefited from the BioR remedy reveal a true decrease in total lipids in one investigation and an increase in triglycerides at this stage and their decrease at the end of the study. Additionally, both BioR and Butofan remedies induced an increase in the blood serum of ß-lipoproteins at both stages of research, while cholesterol values did not show any essential changes. In conclusion, we can state that the BioR product has a beneficial effect on quail, including their lipid metabolism.