Evaluation of boar sire breeding value using probit method

Abstract

Objective of this paper was to evaluate breeding value of boarsires based on four traits of their offspring (average life daily gain and share of meat in carcass sides (%) of offspring-fatteners, number of live born piglets and number of weaned piglets - boars' daughters). Investigation included sires of Swedish Landrace breed and Large White. Breeding value was evaluated on the level of population and within the breed of investigated boars. Data was processed by method of Least Squares (Harvey, 1990), and breeding values of boars evaluated using modified Probit values (Petrović et al., 1995). Obtained results show that the highest total breeding value was established for boar No. 1 (20,832). Its offspring were superior in three of four traits and he is at the same time the first ranked boar. Contrary to this boar, two Large White boar-sires (No. 5 and 6) had offspring with bellow average values for three of four traits. Therefore, these sires influenced improvement of only one trait in their offspring.

Cilj ovog rada bio je da se oceni priplodna vrednost nerasta-očeva na osnovu četiri osobne potomaka (prosečan životni dnevni prirast i udeo mesa u polutkama (%) potomaka-tovljenika, broj živorođene prasadi i broj zalučene prasadi kćeri nerasta). Ispitivanjem su obuhvaćeni očevi rase švedski landras i veliki jorkšir. Priplodna vrednost je ocenjena na nivou populacije i unutar rase ispitivanih nerasta. Podaci su obrađeni metodom najmanjih kvadrata (Harvey, 1990), a priplodne vrednosti nerasta ocenjene su primenom modifikovane vrednosti probita (Petrović et al., 1995). Dobijeni rezultati pokazuju da je najveću ukupnu priplodnu vrednost imao je nerast br. 1 (20,832). Njegovi potomci su bili nadmoćniji u tri od četiri osobine. On je i prvo rangirani nerast. Suprotno od njega, dva nerastaoca rase veliki jorkšir (br. 5 i 6) su imali potomke koji su za tri od četiri osobine bili ispod proseka. Prema tome ovi očevi su uticali na poboljšanje samo jedne osobine potomaka.