Kõrgetoodangulise eesti holsteini tõugu karja aretus- ja sigimisalane analüüs
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Kuupäev
2017
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Töö eesmärk oli hinnata ühe Eesti kõrgetoodangulise holsteini tõugu karja toodangu,
poegimise, sigimise, välimiku ja tootliku ea andmeid ja nende muutumist, ning kuivõrd on
isade aretusväärtused avaldunud tütardel aastatel 2010-2015. Töös antakse ülevaade holsteini
tõu geneetilisest hindamisest Eestis ja naaberriikides. Analüüside läbiviimiseks moodustati
Eesti Põllumajandusloomade Jõudluskontrolli AS ja Eesti Tõuloomakasvatajate Ühistu
andmebaaside alusel andmestik karjas olnud lehmade ja aretuses kasutatud pullide kohta.
Statistiline andmetöötlus teostati programmiga Excel. Peamine analüüsimeetod oli
korrelatsioonianalüüs ja tulemused esitati graafiliselt. Selgus, et kõrgema SPAV-iga pullide
korrelatiivne seos piima-, rasva- ja valgutoodangu vahel suurenes järgneva laktatsiooniga.
Piimatoodangu ja SPAV-i vaheline korrelatsioon oli >3. laktatsioonil r=0,79. SSAV-i ja
somaatiliste rakkude lineaarse skoori vahel leiti negatiivne korrelatiivne seos, mis avaldus
kõige tugevamalt 1. laktatsioonil (r=-0,59). Seega olid kõrgema SSAV-iga isade tütred
parema udara tervisega. Sigivustunnuste seosed vastavate aretusväärtuste vahel nii selgelt
ei väljendunud. Selle põhjuseks võib olla tunnuste madal päritavus või andmete vähesus,
kuna uuringus piirduti ainult ühe farmi andmetega.
The aim of this thesis was to evaluate one of the Estonian high-yield Estonian Holstein herd’s production, calving, female fertility, conformation and longevity traits, and their changes in the years 2010 – 2015 and also to what extent the sires’ breeding values have been expressed in in their daughters. In the first part of the work information is presented about dairy cattle genetic evaluation in Estonia and nearby countries. The data about dairy cattle and the bulls used for breeding were collected from Estonian Livestock Performance Recording Ltd. and the Animal Breeder’s Association of Estonia’s databases. Statistical analysis was performed using Excel. The main analysis used was correlation analysis, and the results were presented graphically. The bulls with higher SPAV had strong genetic correlations between milk, fat and protein yields after the 3rd lactation (r=0.79). The correlation between SSAV and somatic cell linear score was negative, and was strongest in the 1st lactation (r=-0.59). Consequently, the daughters of bulls with higher SSAV value had better udder health traits. The associations between female fertility traits and breeding values were not so clearly expressed. A reason for this could be the low heritability of those traits, or a lack of data, as the analysis was based on data from only one farm.
The aim of this thesis was to evaluate one of the Estonian high-yield Estonian Holstein herd’s production, calving, female fertility, conformation and longevity traits, and their changes in the years 2010 – 2015 and also to what extent the sires’ breeding values have been expressed in in their daughters. In the first part of the work information is presented about dairy cattle genetic evaluation in Estonia and nearby countries. The data about dairy cattle and the bulls used for breeding were collected from Estonian Livestock Performance Recording Ltd. and the Animal Breeder’s Association of Estonia’s databases. Statistical analysis was performed using Excel. The main analysis used was correlation analysis, and the results were presented graphically. The bulls with higher SPAV had strong genetic correlations between milk, fat and protein yields after the 3rd lactation (r=0.79). The correlation between SSAV and somatic cell linear score was negative, and was strongest in the 1st lactation (r=-0.59). Consequently, the daughters of bulls with higher SSAV value had better udder health traits. The associations between female fertility traits and breeding values were not so clearly expressed. A reason for this could be the low heritability of those traits, or a lack of data, as the analysis was based on data from only one farm.
Kirjeldus
Magistritöö
Loomakasvatuse õppekaval
Märksõnad
magistritööd, geneetiline hindamine, aretusväärtused, Eesti Holstein