Impact of incomplete pedigree on breeding value estimation, genetic trends and heritability of pelt trait in Karakul sheep

In order to evaluate the impact of the prediction Incomplete pedigree breeding value and genetic trends of Karakul sheep pelt, from real data collected at the Sarakhs of karakul sheep breeding station during the years 1995 to 2015 were used. Studied trait was: degree of Pelt that birth weight as auxiliary variables in the statistical model was used. For every trait, data from 21 years of selection and mating was saved in separate files. And the file of pedigree, sire’s number by 25% (from zero to one hundred percent) was removed randomly and data files for each trait in a state of complete and incomplete pedigree (removed 25, 50, 75 and 100% Number of Sires) under the animal model was used. Genetic trends of the pelt through regression of average breeding value on Birth year estimate that has to remove different percentages Numbers sire (0, 25, 50, 75 and 100 percent) from pedigree to were as follows: 0.0420 ± 0.0061, 0.0161 ± 0.0056, -0.0472 ± 0.031, 0.0161± 0.0056 and 0.0161 ± 0.0056. And heritability were, respectively: 0.74 ± 1.76, 0.72 ± 1.65, 0.71 ± 1.49, 0.73 ± 1.38 and 0.76 ± 1.25. The overall defect in pedigree by increasing percentage of elimination the number of sire, direct heritability reduced to 75% removal sire's number, then place the increase of heritability was the pelt as well as genetic trend by increasing the removal rate Sire Number fell.