Published in Scientific Papers. Series D. Animal Science, Vol. LIX
Written by Ion BUZU
The aim of the research was to: elaboration a method for estimating the value of Karakul breeding rams through the construction and applying selection complex indexes. The research was conducted on Moldavian Karakul sheep at the flock of National Institute of Animal Livestock and Veterinary Medicine, Maximovca village, Anenii Noi district, Republic of Moldova. In this paper has been examined the methodology of constructing complex index of breeding rams selection of Moldavian Karakul race. It was found that, prior, for construction selection index complex has been reduced the number of characters and appropriation of lambs skin evaluation marks from 29 to 7, and the latter have been synthesized into a single character - Class lamb expressed in points after the decimal system. Have been identified three basic morpho-productive characters (skins quality of descendents, own body weight, milk production of maternal ram) and followed by the selection of breeding rams. It was been determined the economic value (share) of each selection character in the total income of one animal per year. For each selection character in part was been calculated coefficient phenotype aggregate (Cfa), which allows expression of the value of each character in unique units of measure, using the following formula:
Cfa = Pve / Ms(1)
where, Cfa – coefficient phenotype aggregate;
Pve – share the economyc value of selection character;
Ms – phenotype standard size of selection character
Having the aggregate phenotype coefficient for each character selection basis, we have built complex selection index of ram, after following formula:
Ics = (Mfp ∙ Cfap) + (Mfmc∙ Cfamc) + (Mfpl ∙ Cfapl) (2)
where, Ics – selection complex index of ram;
Mfp – phenotype size of skin quality of rams descendents;
Cfap – coefficient phenotype aggregate of skin character;
Mfmc – phenotype size of own body weight of ram;
Cfamc – coefficient phenotype aggregate of body weight character;
Mfpl – phenotype size of mothers ram milk production;
Cfapl – coefficient phenotype aggregate of milk production.
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