Evaluation of Some More Important Phenotypic and Genetic Parameters of the Performance Traits of Small Populations from the Danube White Breed

A. APOSTOLOV
Agricultural Institute, BG-9700 Shumen, Bulgaria

Abstract

APOSTOLOV, A., 2009. Evaluation of some more important phenotypic and genetic parameters of the performance traits of small populations from the Danube White breed. Bulg. J. Agric. Sci., 15: 471-474

A study has been carried out about the phenotypic and genetic variance, heritability and the coefficients of phenotypic, genetic and environmental correlations of the traits subject to selection in the Danube White population reared at the Agricultural Institute - Shumen.
The information on the performance of 563 pigs originating from 46 sires for the period 2003 - 2007 has been analyzed. The replacement animals were fed ad libitum according to the norms for the corresponding category.
It was established that the size of the population studied and the selection carried out led to a decrease in the additive dependent variance for the basic selection traits.
It is noticed that the phenotypic, genetic and environmental correlations between the meat percentage and fat depth are high and negative which makes them equally reliable in the choice of selection criteria (rp, re = -0.6 - 0.7, rg = 0.7 - 0.9).

Key words: phenotypic and genetic variance, correlations and heritability

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