Published in Scientific Papers. Series D. Animal Science., Vol. LVI
Written by Carmen Georgeta NICOLAE, Horia GROSU, Mioara COSTACHE, Monica MARIN, Daniela RADU, Alin BÂDILITA, Victor NIŢĂ
Genetic improvement of animals is defined as a process of directed change in the productive potential of the hereditary characteristics and the genetic resources of livestock populations in the desired direction by man. Achieving genetic improvement of the population is made by selecting the current generation, animals with the highest value of improvement that real genetic value for bio and ecoeconomic important characters. Breeding value cannot be measured directly in animals, but it can be deduced from phenotypic values of animals. Depending on breeding value, assessed individual is retained or dismissed from reproduction. This study was conducted on a sample of 215 individuals Frasinet crap that came from 9 mother families. Frasinet carp, is part, of the morphological point of view, in a constitutional and productive category of carp breeds, with high degree of improved. This breed is characterized by high body profile, curved back and small caudal peduncle, head and fins. Individuals were reared in intensive system, in the same environmental conditions, from the juvenile stage by 2.5 ages. Each descendant was measured for three morphological characters: body weight (W), maximum body height (H) and body length (l) at the end of the first three summers of growth. Of the total of 215 candidates were retained for breeding 50% at end of each summer of growth. For the phenotypic characterization of the population have been used classical statistic methods and breeding value for each character was calculated based on individual animal model (B.L.U.P.-Animal Model). After selection of candidates, at the end of summer growth, annual genetic progress for body weight was 3.51%; 1.69%; 1.27%; for maximum body height was 1.35%; 0.85%, 0.43% and for body length was 1.10%; 0.80%, 0.44%. Expressed in the unit of character, annual genetic progress for body weight at the end of the third summer selection is higher than that of the first two years of selection. This is due to increase muscle mass and gonad development, both are processes specific to installation of sexual maturity.
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breeding value
