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The use and culling reasons for boars in AI station
No full textBakalaureusetöö
Loomakasvatuse õppekavalKultide karjas püsivus ja praakimine mõjutavad aretustõhusust ja majanduslikke tulemusi. Käesoleva töö eesmärk oli analüüsida kultide praakimise põhjuseid ja uurida kultide vanust ja karjas oldud aega, kasutades andmeid kahest Eesti kuldijaamast. Andmeid analüüsiti elulemuse hindamisega ja mitteparameetriliste testidega. Tulemused näitasid, et peamisteks karjast väljalangemise põhjusteks olid sperma kvaliteedi halvenemine ja vähenenud libiido. Samuti osutusid oluliseks jalaprobleemid ja vanus. Karjas oldud aeg sõltus nii farmist kui ka väljalangemise põhjusest – Farm 1 kultide keskmine karjas oldud aeg oli märgatavalt pikem kui Farm 2 kultidel. Statistiliselt oluliselt erinesid ka erinevad väljalangemise põhjused karjas oldud aja poolest. Saadud tulemused annavad praktilisi soovitusi karja juhtimiseks –peamiste praakimise põhjuste teadmine aitab paremini planeerida kultide kasvatamist ja tõhustada aretustöö plaane.Boar longevity and culling significantly influence both breeding efficiency and economic performance. The objective of this study was to analyze the reasons for boar culling and to examine boar age and duration of herd stay based ondata from two Estonian boar stations. The data were processed using survival analysis and non-parametric statistical methods. The results indicated that the primary reasons for culling were reduced semen quality and diminished libido. Leg disorders and advanced age were also important contributing factors. The duration of herd stay was influenced by both the specific farm and the reason for culling – boars in Farm 1 remained in the herd significantly longer than those in Farm 2. Culling reasons also differedsignificantly in terms of their associated herd stay durations. The findings offer practical implications for herd management, as identifyingthe main culling causes facilitates more effective planning of boar utilisation and enhances breeding strategy efficiency
Preoperatiivse paratsetamooli mõju isofluraani minimaalsele alveolaarsele kontsentratsioonile koerte valikulisel ovariohüsterektoomial
No full textFinal Thesis
Curriculum in Veterinary MedicineEffective pain management during canine elective ovariohysterectomy (OHE) continues to
evolve as new multimodal strategies are explored. Paracetamol, a synthetic, non-opiate
analgesic, has gained interest in veterinary anaesthesia and analgesia due to its central
antinociceptive effects and unique mechanism of action. This thesis evaluated whether
preoperative intravenous (IV) paracetamol could reduce the need for inhaled isoflurane and
rescue analgesia during elective OHE in dogs. 28 female dogs were included; 12 received
preoperative paracetamol and 16 did not. Anaesthesia was maintained with isoflurane, with
stepwise reductions applied if no signs of nociception were detected, and fentanyl used for
rescue analgesia when necessary. The findings indicated that dogs receiving paracetamol
required lower isoflurane concentrations during surgery and showed a trend towards reduced
need for rescue analgesia. Postoperative diarrhoea occurred more frequently among
paracetamol-treated dogs, while no significant difference in postoperative pain scores was
observed. In conclusion, preoperative paracetamol may serve as a useful adjunct in
multimodal anaesthesia protocols for canine OHE, contributing to reduced anaesthetic
requirements. Further studies with larger sample sizes are recommended to confirm these
findings and clarify potential gastrointestinal effects.Tõhus valu leevendamine koerte valikulise ovariohüsterektoomia (OHE) ajal areneb pidevalt
koos uute multimodaalsete strateegiate uurimisega. Paratsetamool, sünteetiline mitteopioidne
analgeetikum, on äratanud huvi veterinaaranesteesia ja -analgeesia valdkonnas tänu oma
tsentraalsele antinotsitseptiivsele toimele ja unikaalsele toimemehhanismile. See lõputöö
hindab, kas preoperatiivne intravenoosne (IV) paratsetamool võib vähendada isofluraani ja
päästeanalgeesia vajadust steriliseerimisoperatsiooni (OHE) ajal koertel. Uuringusse oli
kaasatud 28 emast koera; neist 12 said preoperatiivselt paratsetamooli ja 16 ei saanud.
Anesteesiat säilitati isofluraaniga, kusjuures notsitseptsiooni puudumisel vähendati
astmeliselt gaasi kontsentratsiooni ning vajadusel kasutati päästeanalgeesiaks fentanüüli.
Uuringu tulemused näitasid, et paratsetamooli saanud koerad vajasid operatsiooni ajal
madalamaid isofluraani kontsentratsioone ning ilmnes trend vähendatud päästeanalgeesia
vajaduse suunas. Postoperatiivne kõhulahtisus esines sagedamini paratsetamooli saanud
koertel, samas kui postoperatiivsetes valuskoorides olulisi erinevusi ei täheldatud.
Kokkuvõttes võib preoperatiivne paratsetamool olla kasulik lisand multimodaalsetes
anesteesiaprotokollides koerte OHE jaoks, aidates vähendada anesteetikumi vajadust.
Edasised uuringud suuremate valimitega on vajalikud nende tulemuste kinnitamiseks ja
võimalike seedetrakti kõrvaltoimete täpsustamiseks
Life cycle assessment (LCA) in construction materials – Review
No full textReceived: January 7th, 2024 ; Accepted: March 16th, 2025 ; Published: May 15th, 2025 ; Correspondence: [email protected] construction industry is one of the most impactful sectors in terms of natural resource consumption and greenhouse gas emissions, demanding more sustainable and efficient solutions. This study systematically reviews the applicatication of Life Cycle Assessment (LCA) to evaluate sustainable materials and practices within the construction sector, emphasizing the replacement of tradicional materials with recycled, bioeconomic, and low-carbon alternatives. A systematic review was conducted using the Scopus database, covering studies published between 2020 and September 2024. The methodology included the use of VOS viewer software to generate keyword co-occurrence maps, aiding in the identification of emerging trends and patterns. Key findings indicate substantial environmental benefits from incorporating industrial wastes, agricultural by-products, and bioeconomic materials, demonstrating substantial reductions in CO₂ emissions, energy consumption, and natural resource usage. The analysis also highlights emerging technologies, such as 3D printing and nanotechnology, as innovative tools that further enhance sustainability in construction. However, challenges persist, including limited availability of reliable regional data, methodological complexities, and gaps in integrating socio-economic variables into LCA analyses. This paper contributes to advancing sustainable construction by identifying critical gaps and challenges, proposing strategies for improved data collection, recommending enhanced interdisciplinary collaboration, and suggesting increased governmental support and regulatory frameworks to promote broader adoption of LCA in industry practices
Carbon and nitrogen accumulation by agricultural crop residue under three cropping systems
No full textReceived: January 31st, 2024 ; Accepted: April 7th, 2025 ; Published: April 21st, 2025 ; Correspondence: [email protected] crops produce different biomass during their growth, including varying amounts of residue which accumulate a significant amount of carbon (C) and nitrogen (N). Assimilation capacity depends largely on species, variety and growing condition. Carbon accumulation in soil contributes to both - the agricultural production and maintenance of environmental quality reducing atmospheric C and greenhouse gas emissions. In this study, the amount of plant residue left on the field by above-ground and below-ground residue and the amount of C and N accumulated in them in three different cropping systems: organic (Bio); integrated with a low input of N fertiliser (Int-low-N) and; integrated with a high input of N fertiliser (Int-high-N) were evaluated. The most commonly grown cereal crops in Latvia were tested: winter wheat (WW); summer wheat (SW); winter rye (WR); winter triticale (WT); summer barley (SB); summer oat (SO); and buckwheat (BW) as pseudo-cereal crop. The highest biomass of dry matter of total harvest residue in all cropping systems was recorded in WR: 853.3 ± 40.76 g m-2; 1,482.0 ± 105.06 g m-2; 1,628.3 ± 115.49 g m-2 - in Bio; Int-low-N; Int-high-N cropping systems, respectively. The highest amount of carbon (g C m-2) using organic cropping system was accumulated by residue of: WR (268.6 ± 28.68), BW (239.4 ± 10.50) and WW (234.5 ± 27.41). The highest amount of carbon (g C m-2) using integrated cropping system was accumulated by residue of: WR - 473.8 ± 64.9; 496.6 ± 62.54 and WT - 458.2 ± 32.57; 521.1 ± 46.26 in Int-low-N and Int-high-N, respectively. Higher proportion of root biomass cereals formed using organic cropping system
Evaluating the efficiency, environmental impact, and operator benefits of GPS guidance and autosteer technologies in agricultural field operations
No full textReceived: February 1st, 2025 ; Accepted: May 9th, 2025 ; Published: May 16th, 2025 ; Correspondence: [email protected] study evaluated the benefits of GPS guidance and autosteer technologies in agricultural operations through a three-year field experiment conducted at the Smart Bioeconomy Testbed in Central Finland. Adjacent fields were sown either with or without the use of GPS guidance and autosteer, while all other variables were standardized to isolate the impact of the technologies. The movement of the tractor–seeder combination was precisely tracked using RTK GPS with centimetre-level accuracy, and operational parameters were recorded via ISOBUS, supplemented by external measurements of environmental and agronomic factors. Key findings demonstrated that GPS-guided autosteer operations reduced total work time by 9.7% (p < 0.01), primarily due to a 21% (p < 0.01) decrease in overlap and unnecessary movement. This operational efficiency translated into a 20% (p < 0.01) reduction in fuel consumption and a corresponding decrease in CO₂ emissions per hectare. Moreover, GPS-based automation produced more uniform traffic patterns, mitigating localized soil compaction. Operator well-being also improved, with a 10% (p < 0.01) reduction in average heart rate, suggesting reduced physical strain. These benefits were particularly significant in small, irregular fields typical of Finnish agriculture. In conclusion, GPS guidance and autosteer technologies significantly enhance operational efficiency by reducing fuel use, field time, and emissions. These benefits are particularly pronounced in smaller fields, such as those typical in Finland, where improved manoeuvrability yields greater returns. While the technologies contribute positively to operator well-being, individual responses may vary. Further research is needed to assess long-term impacts, explore integration with advanced technologies such as robotics and AI-driven decision support systems, and address the challenges associated with broader adoption
Opportunities for tourism to support the Soomaa dugout boat culture recognized by UNESCO as intangible cultural heritage
No full textMagistritöö
Loodusturismi õppekavalHaabja kui traditsioonilise ühepuupaadi roll ja tähendus on Soomaa piirkonnas kultuuriliselt ja turismiliselt oluline, kuid seni alauuritud. Teema on aktuaalne seoses haabjakultuuri kuulumisega UNESCO kiireloomulist kaitset vajava vaimse kultuuripärandi nimekirja, mis eeldab sihipärast tegevust selle säilitamiseks. Varasemad uuringud on käsitlenud lootsikute ajalugu ja valmistamist, kuid haabja kasutuse sidumine piirkondliku arengu ja kultuurilise identiteediga vajab süvitsi käsitlemist.
Töö eesmärk on uurida haabjakultuuri rolli Soomaa turismis ning turismi potentsiaali UNESCO vaimse kultuuripärandi nimekirja kantud haabjakultuuri hoidmisel.
Uurimuses rakendati kvalitatiivset meetodit ning andmeid koguti poolstruktureeritud intervjuudega viieteistkümnelt Soomaa piirkonna turismi ja kultuuripärandiga seotud isikult.
Tulemused näitavad, et haabjas on küll kultuurisümbol, kuid selle sihipärane kasutus turismis on hetkel piiratud. Peamisteks takistusteks on oskuste ja teadlikkuse puudus ning haabjameistrite vähesus. Siiski näevad kohalikud turismiettevõtjad haabjakultuuris olulist potentsiaali piirkondliku identiteedi ja turunduse arendamisel. Käesolev uurimus toob selgemalt esile haabja sidususe kogukondliku järjepidevuse ja kestliku turismiarendusega. Töö tulemused annavad teavet ja ideid praktiliste arendustegevuste kavandamisel, näiteks haridusprogrammide, kogukonnaprojektide ja keskusena toimiva haabjakoja edendamisel ning see loob aluse edasisteks uuringuteks kultuuripärandi ja turismi lõimimisest regionaalses kontekstis.The logboat holds cultural and touristic significance in the Soomaa region, yet it remains under-researched. The topic has become particularly relevant due to the inclusion of logboat culture on UNESCO's List of Intangible Cultural Heritage in Need of Urgent Safeguarding, which requires targeted actions for its preservation. Previous studies have focused on the history and construction of dugout boats, but a deeper examination is needed to understand the link between the use of logboats and regional development as well as cultural identity.
The aim of this study is to investigate the role of logboat culture in Soomaa's tourism and to assess the potential of tourism in supporting the safeguarding of this UNESCO-recognized intangible cultural heritage.
The research employed a qualitative methodology, gathering data through semi-structured interviews with fifteen individuals involved in tourism and cultural heritage in the Soomaa region.
The results indicate that while the logboat serves as a cultural symbol, its intentional use in tourism is currently limited. The main obstacles are a lack of skills and awareness, along with a shortage of logboat craftsmen. Nevertheless, local tourism entrepreneurs see significant potential in logboat culture for strengthening regional identity and marketing.
This study highlights the interconnectedness of the logboat with community continuity and sustainable tourism development. The findings provide valuable insights and ideas for planning practical development activities, such as educational programs, community projects, and the promotion of a logboat workshop as a central hub. This creates a foundation for further research on the integration of cultural heritage and tourism in a regional context
Analysis of the potential of livestock excreta for urea production through anaerobic digestion: challenges and opportunities in Latin America
No full textReceived: February 15th, 2025 ; Accepted: April 22nd, 2025 ; Published: April 22nd, 2025 ; Correspondence: [email protected] is one of the most demanded fertilizers worldwide and in Latin America. The high dependence on international markets to meet the region’s urea demand, the high consumption of fossil energy for its production, and greenhouse gas emissions increase agricultural production costs and create the need to seek alternative processes for urea production to reduce these adverse effects. In this sense, this work explores the possibility of producing urea in Latin America from the ammonia and CO₂ generated in the anaerobic digestion process of livestock excreta under conditions that favor the production of both gases. The results indicate that it is possible to meet the demand for urea for agricultural use by utilizing 15% of its theoretical potential obtained from livestock excreta. This new alternative for obtaining urea brings economic benefits, reduces greenhouse gas emissions, and fosters social development. However, it faces legal, infrastructure, and technological barriers that may hinder the adoption of this technology in rural areas of Latin America
Compressive strength assessment of foamed glass aggregate concrete
No full textMagistritöö
Maaehituse õppekavalEhitussektori suunitlus rohelisema tuleviku poole toob kaasa vajaduse uurida erinevaid võimalusi negatiivsete keskkonnamõjude vähenedamiseks. Üheks negatiivsete keskkonnamõjude vähendamise võimaluseks on jäätmete kasutamine ehitusmaterjalide valmistamiseks. Käesoleva magistritöö eesmärk oli uurida klaasjäätmetest toodetud vahtklaaskillustiku kasutust betoonis ning määrata vahtklaaskillustikbetooni survetugevus erinevate seguproportsioonide juures.
Magistritöö katsete valmistamisel võeti arvesse varasemaid uuringuid, katseid ning olemasolevat kirjandust seonduvatel teemadel. Vahtklaaskillustikbetoon katsekehade valmistamisel asendati täitematerjal täielikult vahtklaaskillustikuga, vahtklaaskillustik soetati tehasest fraktsiooniga 10-63 mm, mis purustati, sõeluti ning doseeriti betoonisegusse vastavalt proportsioonidele. Seguproportsioonide ja vahtklaaskillustiku sõelkõvera kiiremaks optimeerimiseks valmistati katsekehi kahel viisil, milleks olid täiskatsed, kus valmistati ühe proportsiooni ja sõelkõvera kohta kuus katsekeha ning vahekatsed, kus valmistati ühe proportsiooni ja sõelkõvera kohta üks katsekeha. Magistritöö katselise osa hüpoteesiks oli vahtklaaskillustikbetooni valmistamise võimalikkus survetugevuse vahemikus 3-5 MPa.
Läbiviidud katsetega saavutati rahuldav tulemus ning kinnitati hüpotees, kusjuures saadud tulemusi analüüsiti ja võrreldi omavahel. Saavutatud lõplik katsetulemus oli rahuldav, kuid mitte optimaalne, mille tõttu oleks vaja katseid teha rohkem erinevate sõelkõverate ja proportsioonidega. Vahtklaaskillustiku kasutamisel betoonis ilmnesid kitsaskohad, peamiselt rahuldava töödeldavuse saavutamise ning segu homogeensuse tagamise keerukus, lisaks oli segul ebapiisav veesidumisvõime. Vahtklaaskillustikbetooni, arvestades käesoleva magistritöö katsetulemusi, on potentsiaalselt võimalik rakendada väikeelamute seinakonstruktsioonides, eeldusel, et segu koostisosade vahekorrad ja vahtklaaskillustiku sõelkõver vastavad ettenähtud nõuetele.The tendency towards greener future in the construction industry brings with it the necessity of researching various options to reduce negative environmental impact. One possibility for reducing the negative environmental impact of construction industry is the use of waste products to produce construction materials. The aim of this thesis was to study the use of foamed glass aggregate, made from waste glass, in concrete and to assess the compressive strength of foamed glass aggregate concrete with various mix proportions and aggregate grading curves.
In this thesis, previous research, experiments and literature were considered in the experimental work. In the production of foamed glass aggregate concrete test specimens, the conventional aggregate in concrete was completely replaced with foamed glass aggregate. The foamed glass aggregate was obtained from a factory in the 10-63 mm size range, then crushed, sieved and dosed into concrete mix according to specific proportions.
To optimize the concrete mix proportions and aggregate grading curves more efficiently, two methods of preparing test specimens were used: a full experiment, which included six test specimens per mix proportion and grading curve, and a simplified experiment, which included one test specimen per mix proportion and grading curve.
The hypothesis in this thesis was that it would be possible to produce foamed glass aggregate concrete by completely replacing conventional aggregate with foamed glass aggregate, while achieving a compressive strength of 3-5 MPa in the test specimens. The achieved test results were satisfactory and confirmed the hypothesis. The results of final test series were satisfactory and confirmed the hypothesis, although not optimal and further research should be conducted with different proportions and grading curves.
The usage of foamed glass aggregate in concrete revealed challenges, the main ones being difficulty of achieving satisfactory workability and homogenity of mixture. Additionally, water retention in the concrete mix was insufficient. Foamed glass aggregate concrete considering the results of this thesis, is potentially suitable for use in wall constructions of smaller residential buildings, provided that the proportions of concrete mixture and the grading curve of the foamed glass aggregate strictly meet the specified requirements
Accuracy of Financial Forecasts in Companies Funded via Fundwise
No full textBakalaureusetöö
Maamajandusliku ettevõtluse ja finantsjuhtimise õppekavalOsaluspõhine ühisrahastus on viimastel aastatel kujunenud oluliseks alternatiivseks rahastusviisiks, eriti varajases arengujärgus ettevõtete jaoks, kelle ligipääs traditsioonilisele kapitalile on piiratud. Üheks peamiseks investorite otsustusfaktoriks ühisrahastuskampaaniates on ettevõtete poolt esitatud finantsprognoosid. Varasemad uuringud on aga viidanud, et need prognoosid võivad sageli olla liialt optimistlikud ja nende täitmine jääb kontrollimata. Töö eesmärk on hinnata, kuivõrd täitsid Fundwise’i platvormil aastatel 2015–2022 rahastuse saanud ettevõtted oma kampaaniates esitatud finantseesmärgid. Analüüs tugineb 20 ettevõtte juhtumipõhisele käsitlusele, kusjuures kõik valimisse kuuluvad ettevõtted olid kampaania käigus esitanud vähemalt ühe mõõdetava finantseesmärgi. Andmed koguti kampaaniamaterjalidest ja Äriregistrisse esitatud majandusaasta aruannetest ning keskenduti müügitulu, kasumi ja dividendidega seotud lubaduste täitmisele. Tulemused näitavad, et vaid kaks ettevõtet 20-st (10%) täitsid selgelt vähemalt ühe eesmärgi. Dividendide maksmist lubanud 16 ettevõttest maksid neid tegelikult vaid kaks, sedagi väiksemas mahus kui lubatud. Müügitulu- ja kasumiprognoosid jäid enamasti saavutamata. Tulemused on kooskõlas varasemate uuringutega, mis osutavad prognooside ja tegelikkuse vahelisele vastuolule. Uuring rõhutab vajadust realistlikumate prognooside, suurema investori teadlikkuse ning tugevama platvormipoolse järelevalve järele. Edasised uuringud võiksid keskenduda sellele, kas finantseesmärkide täitmine on seotud ettevõtte pikaajalise kestlikkuse ja kasvuvõimega. Samuti oleks oluline analüüsida prognooside koostamise kvaliteeti ja platvormide järelevalvemehhanisme eri riikide ühisrahastusmudelite võrdluses. Täiendavat uurimisväärtust pakuks ka finantslubaduste täitmise erinevuste kaardistamine sektorite lõikes, et selgitada välja valdkonnad, kus prognooside usaldusväärsus on süsteemselt kõrgem või madalam.In recent years, equity-based crowdfunding has emerged as a significant alternative financing method, particularly for early-stage companies with limited access to traditional capital. One of the key decision-making factors for investors in crowdfunding campaigns is the financial forecasts presented by companies. However, previous studies have suggested that such projections are often overly optimistic and rarely subject to follow-up evaluation. The aim of this thesis is to assess the extent to which companies funded via the Fundwise platform between 2015 and 2022 have fulfilled the financial goals stated in their campaigns. The analysis is based on a case study of 20 companies, all of which had presented at least one measurable financial objective. Data were collected from campaign materials and annual reports available in the Estonian Business Register, with a focus on evaluating outcomes related to revenue, profitability, and dividend payments. The results show that only two out of 20 companies (10%) clearly met at least one stated goal. Of the 16 companies that promised to pay dividends, only two actually did so, and even then in smaller amounts than originally projected. Revenue and profit forecasts were largely unfulfilled. These findings are consistent with previous research highlighting the gap between financial projections and actual outcomes. The study underscores the need for more realistic forecasts, increased investor awareness, and stronger oversight mechanisms from crowdfunding platforms. Future research could explore whether the fulfillment of financial goals correlates with long-term business sustainability and growth. It would also be valuable to examine the quality standards of financial forecasting and platform-level control mechanisms across different countries' crowdfunding models. Additionally, analyzing sector-specific differences in forecast accuracy could help identify areas where financial projections are systematically more or less reliable
Patterns in the Spatiotemporal Distribution of Pollen – Aerobiological Calendar
No full textMagistritöö
Loodusturismi õppekavalÕietolmuallergia all kannatavate inimeste hulk kasvab pidevalt, kuid aerobioloogilise seire korraldamine ei ole Euroopa Liidus piisavalt reguleeritud ega riiklikul tasandil vajalikus mahus rahastatud. Eestis pandi aerobioloogilisele seirele alus 1989. aastal Zooloogia ja Botaanika Instituudis ning vahepealse katkestuse järel (2007-2010), taasalustati seirega 2011. aastal Eesti Keskkonnauuringute Keskuses.
Käesoleva magistritöö eesmärk oli koostada aerobioloogiline kalender Tartu seirejaamas aastatel 2012–2022 kogutud andmete põhjal ning võrrelda seda 1990–1998. aastatel Tartu seirejaamas kogutud andmetel põhineva „Lõuna-Eesti aerobioloogilise kalendriga“, mille koostasid Maret Saar ja Anneli Poska. Lisaks koostati tänapäevast situatsiooni kajastavad piirkondlikud aerobioloogilised kalendrid peamiste allergeensete taksonite (ambroosia, kask, kõrrelised, lepp, puju, sarapuu) kohta Tallinna, Tartu ja Pärnu seirejaamade andmete põhjal. Töös kasutati Hirsti-tüüpi proovivõtturitega kogutud aerobioloogilisi andmeid ning andmete töötlemisel rakendati statistilisi meetodeid, sealhulgas z-testi, et hinnata õietolmuhooaja piirkondlikke erisusi. Tulemused näitasid, et varakevadiste taksonite (lepp, kask, sarapuu) õietolmuhooaja algus on varasemaks nihkunud, samal ajal kui intensiivne õietolmuperiood on lühenenud ja õietolmu kontsentratsioon vähenenud. Tartu seirejaamas oli varakevadiste taksonite õietolmu kontsentratsioon kõrgem ja õietolmuhooaeg pikem võrreldes Tallinna ja Pärnu seirejaamadega. Tallinna seirejaama andmed näitasid, et lepa ja sarapuu õietolm ilmub mõõtmistulemustesse sageli juba seire esimesel dekaadil, oluliselt enne seire algust teistes seirejaamades ja viitab vajadusele alustada aerobioloogilist seiret varem kõigis Eesti seirejaamades. Lisaks kinnitas Tartu seirejaama kahe perioodi võrdlus lähi kümnendite jooksul seoses üldise kliimamuutusega toimunud õietolmuhooaja alguse varasemaks nihkumist, veelgi rõhutades varakevadiste liikide seireperioodi varasema alguse vajadust kogu Eestis. Aerobioloogiliste kalendrite koostamine ja õietolmuhooaja analüüs võimaldab täpsemalt prognoosida allergiariske ning pakkuda allergikutele usaldusväärset ja ajakohast teavet. Töö tulemused pakuvad tuge aerobioloogilise seire tõhususe parandamiseks ja allergiariskide ennetamiseks.The number of people suffering from pollen allergies is constantly increasing, but aerobiological monitoring is not sufficiently regulated within the European Union and lacks adequate funding at the national level. In Estonia, aerobiological monitoring was initiated in 1989 at the Institute of Zoology and Botany, and after a temporary interruption (2007-2010), aerobiological monitoring has been carried out by the Estonian Environmental Research Centre since 2011. The aim of this master's thesis was to develop an aerobiological calendar based on data collected at the Tartu monitoring station from 2012 to 2022 and to compare it with the „Aerobiological Calendar of Southern Estonia“, which was compiled by Maret Saar and Anneli Poska based on data collected at Tartu monitoring station from 1990 to 1998. Additionally, regional aerobiological calendars reflecting the current situation for the main allergenic taxa (ragweed, birch, grasses, alder, mugwort, hazel) were compiled using data from the monitoring stations in Tallinn, Tartu, and Pärnu. The study used aerobiological data collected with Hirst-type volumetric samplers, and statistical methods, including the z-test, were applied in data processing to assess changes in pollen seasons and regional variations. The results showed that the onset of pollen season for early spring flowering taxa (alder, birch, hazel) has shifted to an earlier period, while the duration of the peak pollen season has shortened and become less intense. Tartu monitoring station recorded a higher and more prolonged pollen concentration compared to the Tallinn and Pärnu stations. Data from the Tallinn monitoring station showed that alder and hazel pollen often appear in the measurements already in the first decade of monitoring, which is significantly earlier than the monitoring in other stations begins, indicating the need to start pollen monitoring earlier at all stations in Estonia. The comparison between two aerobiological calendars confirmed that the earlier onset of the pollen season is related to general climate change, further emphasizing the need to start start the monitoring period earlier throughout Estonia, particularly for early flowering taxa. Compiling aerobiological calendars and analyzing pollen seasons enable more accurate allergy risk predictions and provide reliable and up-to-date information for allergy sufferers. The results of this work support the need for improvements in the effectiveness of pollen monitoring and the prevention of allergy risks