Kultide kasutamine ja karjast väljamineku põhjused kuldijaamas
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Kuupäev
2025
Kättesaadavus
04.09.2025
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Kultide 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.
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.
Kirjeldus
Bakalaureusetöö
Loomakasvatuse õppekaval
Märksõnad
bakalaureusetööd, praakimine, praakimispõhjused, seatõud, elulemus