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Zhodnocení významu plemeníka Scyris v chovu českého teplokrevníka
Kubíková, Zuzana
The aim of this diploma thesis was to evaluate the significance of the stud horse Scyris in the breeding of the Czech Warmblood. To evaluate the stud horse we used his offspring born in the years 2011 to 2016. Two underlying databases were then created in the programme Microsoft Office Excel 2007. The first was used to assess linear regression and the second to assess correlation using the Pearson correlation coefficient. Escalation of the linear regression and the Pearson correlation coefficient was carried out using the statistics software UNISTAT 6.5. All of the data entered in the underlying database were acquired from the website of the Association of Czech Warmblood Breeders. From the total information obtained about stallion 6062 Scyris (POL) it is evident that he was most favoured by Czech Warmblood breeders in the year 2013. Furthermore, it was determined that there is a higher percentage of colts than fillies among his offspring. When monitoring exterior variability in 14 daughters that have been assigned a class and their dams, we recorded the minimum, maximum and mean values of the basic body measurements both numerically and graphically. On the basis of aggregate statistics from these measurements, it can be stated that the dams are unbalanced in exterior terms, and stallion 606 Scyris (POL) did not succeed in balancing out this variability in his daughters. In the next step, the correlation dependence of individual body measurements was assessed in daughters and dams. It was determined that there is medium correlation dependence between the attributes KVP (tape withers height), KVH (stick withers height) and Ohol (cannon bone circumference), so it can be said that the influence of dams on the bone mass and withers height of daughters is probable but is not conclusive. With the attribute OH (chest circumference) low correlation dependence between dams and daughters was recorded. This suggests that the dams have a lesser influence on the bulkiness of daughters, and that stallion 6062 Scyris (POL) has a refining effect on the build of his offspring. When assessing the linear regression, we recorded a decreasing tendency of the regression coefficient with regard to offspring class which exhibits 16% reliability and according to our test emerges as statistically conclusive. So the assessed class of daughters of the sire 6062 Scyris (POL) does not improve but on the contrary, it decreases slightly. A high value for the downward trend was recorded with the jump index of the dams and is documented by 21,66 % reliability. Our test emerged as highly statistically conclusive and we can conclude that the mares mated with stallion 6062 Scyris (POL) are of relatively low quality in performance terms. Our final step was to analyse the colouring of offspring, where it was determined that grey colouring was present in 58 % of the offspring. On the basis of an evaluation of the dams and offspring, it was concluded that stallion 6062 Scyris (POL) carries a heterozygous set of alleles in the G gene, which influences the grey colouring of horses.
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