Evalution of laying geese based on the interaction “genotype × environment”
DOI:
https://doi.org/10.32636/01308521.2023-(73)-2-14Keywords:
geese, laying, “genotype × environment” interaction, plasticity, stabilityAbstract
The paper presents the results of research on the evaluation of the polygenically determined quantitative trait “laying” under the influence of the interaction “genotype × environment” on the wide genetic material of geese. It was represented by the original family forms of domestic selection (large gray breed, Rhine white breed), descendants of the first – third generations and the created dimorphic population. Laying of geese was determined within five months of egg-laying. By using two-factor variance analysis, a probable influence of genotypic affiliation (P<0.05) and month of egg-laying (P<0.001) on the level of manifestation of laying geese of the studied groups was established. The likely difference in the gradation of the "condition" factors made it possible to evaluate the parameters of plasticity and stability in the studied groups of geese. Geese of the original family forms and F1 offsprings turned out to be more plastic in terms of egg-laying. The birds of the second and third generations and the dimorphic population were less plastic in this respect. This means that geese of large gray and Rhine breeds and their descendants reacted poorly to environmental conditions, while birds of other groups, on the contrary, were more sensitive to the influence of active factors. Breeding birds have higher plasticity than local birds. This indicates its greater adaptability to local conditions of keeping as a result of long-term breeding in such conditions. The stability variant (S2i) shows how reliably the selection feature of the studied group of birds corresponds to the plasticity estimated by the regression coefficient. The closer the S2i indicators are to zero, the less the empirical values of the characteristic differ from the theoretical values located on the regression line. Therefore, groups of birds with a high regression coefficient and a low variance of trait stability will have a high level of productivity. Geese of the Rhine breed, descendants of F3 and dimorphic population were characterized by high stability in laying (S2i =0.12–0.19). In these birds, high values of plasticity are combined with low stability, which is important for the manifestation of a high level of productive traits. Large gray geese and F1–F2 offspring were less stable in terms of egg laying (S2i =0.67–1.09).
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