VARIABILITY OF GENETIC PARAMETERS OF KARAKUL SHEEP IN DIFFERENT ECOLOGICAL ZONES
DOI:
https://doi.org/10.25930/2687-1254/008.3.15.2022Keywords:
Karakul sheep, Karakul lambs, selection trait, genetic parameter, variability of characteristic, gene pool, breeding areaAbstract
Wide genotypic variability, which is the basis of the diversity of the Karakul
breed, is the essential part for the qualitative improvement of its gene pool. The heritability
index of a trait, being part of the phenotypic variability due to genetic differences, is used as a
criterion for the reliability of the phenotype to assess the breeding value of animals.The use of
information about the correlations of important breeding traits of animals makes it possible to
simplify and speed up the breeding process, since in Karakul sheep breeding, selective
breeding is carried out according to many phenotypically manifested quantitative and
qualitative traits, which makes it difficult to achieve the desired genetic progress through
selection in a short time. The information we received on the study of correlations of traits
indicates the existence of significant correlations between these indicators. It has been established that among the studied correlations of lambs traits, the highest indicator is observed
(0.78, P<0.001) in the length of the curl of mothers and their offspring. Quite high correlation
indicators of type (0.67, P<0.001) and pattern (0.59, P<0.05) were established. High rates of
heritability of important traits of sheep, which were bred in the sandy desert and foothill semidesert show their stable heredity. At the same time, the coefficients of heritability of the type
(0.83) and length (0.69) of the curl, which were established in the foothill semi-desert, exceed
ones of the sandy zone. The heritability of such important breeding traits as density (0.63),
pattern (0.43), hair covering quality (0.43) is higher in the sandy zone. The data on the coefficients of heritability of traits, the selection differential and the degree of selection efficiency
indicate that black animals, which were bred in the sandy desert have a fairly high hereditary
base (h2), which positively affected the genetic progress through selection (R).
