THE HEREDITY AND LEVEL OF THE PHENOTYPIC DOMINATION OF SELECTION SIGNS IN THE BREEDING OF THE BREEDS OF RABBITS POLTAVA SILVER AND NOVOSELAND WHITE

Abstract

Based on the study of the performance indicators of rabbits obtained by purebred breeding and crossing under conditions of the crawling farm of Cherkasy Experimental Station of bioresources, the nature of the inheritance of breeding traits and the degree of phenotypic dominance in the first generation of offspring are established. The results indicate a different pattern of inheritance of breeding traits. A significant difference was found when comparing the average body lengths of purebred young and pedigree, which was 7.5 cm (P> 0.999). The coverage of the breast did not have a significant difference and was within 27.3-27.8 cm (P <0.95). The live weight index at the age of 30 and 120 days of young stocked had an advantage of 40.7 g over the group of analogues of the breed of Poltava silver, but the difference was not significant (P <0.95).

The study of phenotypic correlations and the nature of inheritance suggests that with purebred breeding, given the slight variability of the studied traits, a correlation with the indicator of the waist width (r = 0.26, P> 0.99) turned out to be likely. Regarding inheritance ratios, the latter varied in the range of 0.12-0.52 and turned out to be reliable for such breeding characteristics as live weight in adulthood - 0.27 (th2 = 10.25) and width of the loin - 0.52 (th2 = 2.48). Analysis of the phenotypic correlation between the breeding traits of the initial population and the descendants of group II showed an inverse relationship between the studied parameters (r = -0.08 ... -0.35), except for the indicator of the waist width, for which the established coefficient was +0.26 (P> 0.99). The correlation between the indicator of body length and body weight at the age of 120 days (P> 0.999) was also significant. The calculated coefficients of inheritance of breeding traits showed the probability of these characteristics (h2 = 0.52-0.70, P> 0.99 ... 0.999). The maximum value is registered for the indicator of body length, and the minimum, respectively, for the indicator of live weight of young animals at the age of 30 days.

The study of the influence of producers' genotype on the phenotypic manifestation of breeding traits in descendants showed a fairly high and highly reliable share of the effect of this indicator on the indicator of body length and index of congestion in next- generation animals (ηx2 = 0.48 and 0.56, P> 0.999).