Original title:
Vybrané aspekty souhrnného selekčního indexu v populacích strakatého skotu
Authors:
Kopec, Tomáš Document type: Doctoral theses
Year:
2013
Language:
cze Abstract:
[cze][eng] Cílem této práce byl odhad genetických korelací mezi vlastnostmi s využitím plemenných hodnot a konstrukce selekčního indexu pro býky a krávy českého strakatého skotu na základě těchto korelací. Genetické korelace byly odhadnuty z odregresovaných plemenných hodnot. Komponenty rozptylu byly stanoveny pomocí procedury REML. Genetické korelace byly podobné korelacím plemenných hodnot. Mezi ukazateli mléčné užitkovosti se pohybovaly korelace od 0,79 do 0,93, u masné užitkovosti 0,41 - 0,59. Korelace plemenných hodnot, genetické korelace a ekonomické hodnoty byly použity pro konstrukci selekčního indexu býků. Mléčná produkce je v indexu zastoupena 45 %, masná užitkovost 24 %, exteriér 16 % a fitness 15 %. Celkový monetární zisk je rozdělen následovně: 86,7 % připadá na mléčnou užitkovost, 5,13 % na masnou užitkovost a 8,08 % na fitness. Spolehlivost tohoto souhrnného selekčního indexu je 0,86.The aim of this study was to estimate genetic correlations between traits using breeding values and to propose a total merit index for bulls and cows of Czech Fleckvieh cattle on the basis of these correlation. Genetic correlation was estimated from de-regressed proofs. REML procedure was used for determining components of variance. The basic database included 785 breeding values of bulls of Czech Fleckvieh and 441 of Fleckvieh (German and Austrian population). Estimated genetic standard deviations were similar to the standard deviations of breeding values and they always had a higher value. The genetic correlations were similar to correlations of breeding values as well. The genetic correlations matrix showed that the relationships were mostly within particular groups of traits. There were correlations 0,79 - 0,93 among milk production traits and 0,41 - 0,59 among beef production traits. Estimated genetic correlations, breeding values correlations and economic weights set by Wolfová et al. (2007) were used for construction of selection index for Czech bulls. Milk production has 45 %, beef 24 %, exterior 16 % and fitness 15 % within this total merit index. The total monetary gain is divided as follows: 86,7 % for milk production, 5,13 % for beef traits and 8,08 % for fitness. Reliability of this total merit index is 0,86. The total merit index for cows has as the same composition as the index of bulls; the missing breeding values (fertility, calving ease and longevity) were computed using genetic correlations estimated for bulls. In conclusion, incorporation of new breeding values will increase the genetic level of fitness traits. Estimation of genomic breeding values for milk and fitness allows obtaining reliable breeding value earlier.
Keywords:
korelace; plemenné hodnoty; skot; český strakatý skot