Stefanyshyn Olha
Ph.D
Leading researcher, Laboratory of Physiology, Biochemistry and Nutrition of Poultry
oliastef @ukr.net
Education:
1997: Graduated from the Lviv Academy of Veterinary Medicine named after S. Z. Gzhytskyi, qualifying as a "Doctor of Veterinary Medicine".
1998: Enrolled in a part-time postgraduate program specializing in 03.00.04 – "Biochemistry" at the Institute of Agriculture and Animal Biology of the UAAS (presently the Institute of Animal Biology of the NAAS).
2002: Successfully defended a Ph.D. dissertation titled "Ontogenetic Features of Protein Metabolism in Goose Tissues and Certain Factors of Its Regulation" and was awarded the degree of Candidate of Agricultural Sciences in Biochemistry. Scientific Advisor: Dr. Vadym G. Yanovych, Doctor of Biological Sciences, Professor.
2010: Awarded the academic title of Senior Researcher.
•2000 – Appointed Research Fellow at the Poultry Nutrition Laboratory.
•February 2003 – September 2004 – Worked at the Lviv Regional State Center for Standardization, Metrology and Certification, State Consumer Standard of Ukraine.
•Since September 2006 – Transferred to the position of Senior Research Fellow at the Laboratory of Physiology, Biochemistry, and Poultry Nutrition, Institute of Animal Biology, NAAS.
•Since February 2024 – Promoted to Leading Research Fellow at the same laboratory.
Scientific Activity
Member of the Ukrainian Biochemical Society.
Author and co-author of 160 publications, including 2 Ukrainian DSTU standards, 2 SOUs, 7 methodological recommendations, and a reference book “Laboratory Methods of Research in Biology, Animal Husbandry, and Veterinary Medicine.”
Scientific Interests
•Study of metabolism during ontogenetic development of poultry of new highly productive crosses and lines of various species, and development of methods for its correction.
•Increasing the transformation of feed nutrients into products for functional and health-promoting purposes.
Recent publicatiion Scientific Works:Hunchak A.V., Medvid S.M., Stefanyshyn O.M., Sirko Ya.M., Korechuk S.I. Level of accumulation of microelements (Mn, Zn, Cu, Fe, Co, I) in the body and yolks of quails depending on their form and amount in the diet. Scientific Bulletin of LNUVM and BT named after S.Z. Gzhytskyi. Agricultural Sciences Series, 2021, vol. 23, no. 94, pp. 50–55. DOI: 10.32718/nvlvet‐a9410.
Sirko Ya, Hunchak A., Kyryliv B., Stefanyshyn O. Effect of the enzyme preparation “Natuzym” and sulfur citrate on the lipid metabolism of quails. The 1st Ukrainian-Polish Scientific Forum AGROBIOPERSPECTIVES, Lviv, Ukraine, 29–30 September 2021, p. 109.
Ratych I., Hunchak A., Sirko Ya., Stefanyshyn O., Kyryliv B., Khomyk I. Productivity and quality of eggs of laying hens depending on qualitative and quantitative composition of dietary protein. Animal Biology, 2022, vol. 24, no. 3, pp. 27–32.
Hunchak A.V., Sirko Ya.M., Kyryliv B.Ya., Stefanyshyn O.M., Ratych I.B., Hunchak V.M., Gutyj B.V. Intensity of metabolic processes in laying hens due to changes in qualitative and quantitative composition of dietary protein. Colloquium-journal, 4(163), 2023, pp. 40–46. DOI: 10.24412/2520-6990-2023-4163-40-46.
Sirko Ya., Hunchak A., Stefanyshyn O. Biochemical indicators of blood in hens depending on changes in the qualitative and quantitative composition of dietary protein. In: Innovations in Poultry Farming [Internet]. Kharkiv, October 13, 2023; pp. 35–38.
Hunchak A., Stefanyshyn O., Sirko Ya., Kyryliv B., Ratych I. Influence of exogenous enzymes and different sulfur forms in broiler chicken diets on productivity and product quality. Animal Biology, 2024, 27(4):49–54. DOI: 10.15407/animbiol26.04.049.
Hunchak A., Stefanyshyn O., Sirko Y., Kyryliv B., Ratych I., Hunchak V., Gutyj B., Pakholkiv N., & Sachko S. (2025). Innovative feed additives in the optimization of laying hen diets. Regulatory Mechanisms in Biosystems, 16(4), e25204. doi.org
Hunchak A., Stefanyshyn O., Kyryliv B., Sirko Ya. Wpływ optymalizacji diety kur na wskaźniki biochemiczne krwi i wydajność nieśności (Impact of optimization of laying hen diets on biochemical indicators of their blood and productivity). In: One Health: People, Animals, Environment — Our Common Future [Internet]. Wrocław, October 1–5, 2025. University of Natural Sciences in Wrocław.