Stochastic simulation of the influence of insemination on the estimation of breeding value and its reliability
2007
Vesela, Z.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic) | Pribyl, J.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic) | Vostry, L.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic) | Stolc, L.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Specialni Zootechniky
The objective of the paper was to evaluate the impact of reference sires in insemination on the estimation of breeding value and its reliability by means of stochastic simulation based on a single addition of calves to the basic set. The simulation was divided into three variants according to the connectedness of calves as follows: variant 1 - unrelated calves, variant 2 - calves related between HYS but unrelated within HYS, variant 3 - calves related within and between HYS. The degree of connectedness was determined by computation of genetic drift variance (GDV). The average value of GDV in the basic set was 0.71. The highest values of GDV were reached in simulated variant 3, in which the relationship increased not only between HYS but also within HYS. The lowest values of GDV were in variant 2 when the relationship increased only between HYS. The single use of reference sires in one generation slightly increased the average coefficient of reliability from 0.121 to 0.145 in the whole set. The increase in reliability was mainly due to an increase in the number of contemporaries. A decrease in the effective number of sires' offspring was an indirect consequence of the increase in the connectedness of the set and higher use of reference sires in insemination. The use of reference sires influenced the fluctuation of breeding values. The use of a higher number of reference sires in insemination with only one offspring in each of the connected herds appeared as the most suitable approach from the aspect of the connectedness of the set and reliability of breeding value estimation.
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