| Basic data |
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| OCA1. Surname awarded to the assessed person | Valocký |
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| OCA2. Name awarded to the assessed person | Igor |
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| OCA3. Degrees awarded to the assessed person | Prof. , DVM, PhD |
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| OCA4. Hyperlink to the entry of the person in the Register of university staff | https://www.portalvs.sk/regzam/detail/6025 |
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| OCA5. Area of assessment | study programme general veterinary medicine · I. + II. degree |
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| OCA6. Category of the research/artistic/other output | scientific output |
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| OCA7. Year of publication of the research/artistic/other output | 2017 |
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| OCA8. ID of the record in the Central Registry of Publication Activity (CRPA) or the Central Registry of Artistic Activity (CRAA) | UVL.Košice.0025568 |
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| OCA9. Hyperlink to the record in CRPA or CRAA | http://www.crepc.sk/portal?fn=*recview&uid=2207096&pageId=resultform&full=0 |
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| Characteristics of the output that is not registered in CRPA or CRAA |
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| OCA10. Hyperlink to the record in another publicly accessible register, catalogue of research/ artistic/other outputs | https://www.webofscience.com/wos/woscc/full-record/WOS:000389095900020 |
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| OCA11. Characteristics of the output in the format of the CRPA or the CRAA bibliographic record, if the output is not available in a publicly accessible register or catalogue of outputs | ADC Dietary supplementation of yucca (Yucca schidigera) affects ovine ovarian functions = Suplementácia diéty yukou (Yucca schidigera) ovplyvňuje ovariálne funkcie oviec / Vlčková Radoslava, Sopková Drahomíra, Andrejčáková Zuzana, Valocký Igor, Kádasi Attila, Harrath Abdel Halim, Petrilla Vladimír, Sirotkin Alexander, 2017. In: Theriogenology. - ISSN 0093-691X. - Vol. 88(2017), s. 158–165. |
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| OCA12. Type of the output (if the output is not registered in CRPA or CRAA) | article |
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| OCA13. Hyperlink to the webpage where the output is available (full text, other documentation, etc.) | https://www.sciencedirect.com/science/article/pii/S0093691X16304393?via%3Dihub |
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| OCA14. Characteristics of the author's contribution | Participation in the experimental part, evaluation of the achieved results and participation in the final editing of the publication. |
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| OCA15. Annotation of the output with contextual information concerning the description of creative process and the content of the research/artistic/other activity, etc. | Yucca (Yucca schidigera) is a popular medicinal plant due to its many positive effects on animal and human physiology, including their reproductive system. In order to investigate the effect of yucca supplementation on sheep reproduction, including ovarian function and its hormonal regulators, ewes were fed (or not fed, control) yucca powder (1.5 g/head/day, 30 days). Macromorphometric parameters of the fallopian tube, ovaries, and ovarian folliculogenesis were measured. Blood levels of reproductive hormones were measured by radioimmunoassay. Granulosa cells were aspirated from the ovary and their proliferation and apoptosis were determined by immunocytochemistry. To assess secretory activity and its response to gonadotropin, ovarian fragments from treated and control sheep were cultured with and without follicle-stimulating hormone (FSH; 0, 0.1, 1, 10, or 100 IU/ml) and the release of reproductive hormones into the culture medium was assessed. Finally, to examine the direct effect of yucca on the ovaries, ovarian fragments from control sheep were cultured with and without yucca extract (1, 10, or 100 mg/ml) and the release of reproductive hormones was measured. |
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| Other data |
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| OCA16. Annotation of the output in English | Yucca (Yucca schidigera) is a popular medicinal plant due to its many positive effects on animal and human physiology, including their reproductive systems. To examine the effect of supplemental yucca feeding on sheep reproduction, including ovarian functions and their hormonal regulators, ewes were fed (or not fed, control) yucca powder (1.5 g/head/day, 30 days). Macromorphometric indexes of the oviduct, ovary, and ovarian folliculogenesis were measured. Reproductive hormone levels in the blood were measured using a radioimmunoassay. Granulosa cells were aspirated from the ovary, and their proliferation and apoptosis were detected using immunocytochemistry. To assess secretory activity and its response to gonadotropin, ovarian fragments of treated and control ewes were cultured with and without follicle-stimulating hormone (FSH; 0, 0.1, 1, 10, or 100 IU/mL), and the release of reproductive hormones into the culture medium was evaluated. Finally, to examine the direct action of yucca on the ovary, ovarian fragments from control ewes were cultured with and without yucca extract (1, 10, or 100 mg/mL), and the release of reproductive hormones was measured. |
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| OCA17. List of maximum 5 most significant citations corresponding to the output | Swelum, A.A., Hashem, N.M., Abdelnour, S.A., Taha, A.E., Ohran, H., Khafaga, A.F., El-Tarabily, K.A., Abd El-Hack, M.E. Effects of phytogenic feed additives on the reproductive performance of animals(2021) Saudi Journal of Biological Sciences, 28 (10), pp. 5816-5822
Ruan, J., Qu, L., Zhao, W., Gao, C., Huang, P., Zheng, D., Han, L., Yu, H., Zhang, Z., Zhang, Y., Wang, T. Identification and Structural Analysis of Spirostanol Saponin from Yucca schidigera by Integrating Silica Gel Column Chromatography and Liquid Chromatography/Mass Spectrometry Analysis(2020) Molecules, 25 (17), art. no. 3848
Adegbeye, M.J., Elghandour, M.M.M.Y., Monroy, J.C., Abegunde, T.O., Salem, A.Z.M., Barbabosa-Pliego, A., Faniyi, T.O. Potential influence of Yucca extract as feed additive on greenhouse gases emission for a cleaner livestock and aquaculture farming - A review(2019) Journal of Cleaner Production, 239, art. no. 118074
Abd El-Hack, M.E., Abdelnour, S.A., Abd El-Moneim, A.E.-M.E., Arif, M., Khafaga, A., Shaheen, H., Samak, D., Swelum, A.A. Putative impacts of phytogenic additives to ameliorate lead toxicity in animal feed(2019) Environmental Science and Pollution Research, 26 (23), pp. 23209-23218
Valencia del Toro, G., Ramírez-Ortiz, M.E., Flores-Ramírez, G., Costa-Manzano, M.R., Robles-Martínez, F., Garín-Aguilar, M.E., Leal-Lara, H. Effect of yucca schiedigera bagasse as substrate for oyster mushroom on cultivation parameters and fruit body quality [Efecto del bagazo de yucca schiedigera en el sustrado del hongo ostra sobre los parámetros de cultivo y la calidad de los cuerpos fructifero](2018) Revista Mexicana de Ingeniera Quimica, 17 (3), pp. 835-846 |
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| OCA18. Characteristics of the output's impact on socio-economic practice | Our observations suggest several possible mechanisms by which yucca may affect ovarian function and fertility, through effects on ovarian cell apoptosis, P4, E2, and IGF-I release, and ovarian response to FSH. Functional hierarchical interrelationships among these effects are highly likely. Yucca phytoestrogens or other molecules, directly or through ovarian and/or neoovarian IGF-I, could affect ovarian steroids that promote apoptosis and influence ovarian folliculogenesis. The functional interrelationships among these signaling molecules, as well as the ultimate impact of yucca feeding on sheep fertility, require further study. It is possible that the reproductive effects of yucca are species-specific; the effects of yucca on sheep blood hormones and ovarian cells only partially corresponded to those previously observed in rabbits and pigs. Our observations suggest a negative effect of yucca supplementation on the ovine ovary: unlike in other species, in sheep yucca suppresses follicular growth, releases ovarian hormones, promotes ovarian cell apoptosis, and alters ovarian cell response to FSH. Based on our observations, we could not exclude that yucca may induce lower oocyte viability in sheep, reduce follicle luteinization, and CL formation and development, and thus implantation and pregnancy maintenance. However, further in vivo studies should verify this hypothesis. |
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| OCA19. Characteristics of the output and related activities' impact on the educational process | The publication is suitable study literature for students of the general veterinary medicine study program. |
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