INFLUENCE OF CONSANGUINITY ON PRODUCTIVE INDICES OF CC21 PIGS

SUMMARY The BLUP animal model methodology was employed for determining the influence of levels of consanguinity on productive performance of CC21 pigs. A sample of 9 672 individuals sons from 951 mothers and 278 fathers from the Genetic Centre “El Jigue” (4 996 males and 4 676 females) was examined. Individual consanguinity coefficients were estimated in this population of animals to be selected between 1993 and 2005. The pedigree file accounted for 10 680 animals. The consanguinity coefficients (Fx, %) were obtained from the estimated genetic value (VGE in Spanish), calculated by the MTDFREML program, using an unicharacter animal model. Coefficients per sex, year, line and genealogic family were analyzed, as well as the following traits: final weigh (PF, kg), weight per age (PPE, g) and backfat thickness (EGD, mm) by using a general linear model. The consanguinity coefficients for males and females were found to be below 6%, with values of 2.2 and 2.1%, respectively. Fx values per year were kept below an increase rate below 1%. Consanguinity coefficients either within lines (1.9-2.7%) or families (1.5-2.6%) were within the accepted range of values. It was confirmed that there were los consanguinity coefficients in pigs from the CC21 herd, and therefore there are no influence of this index on productive performance of these animals. The continuation of a careful work in this direction is recommended, as well as to go in depth to actions contributing to the conservation of this authoctonous genofond.