THE MODEL OF MOLDAVIAN KARAKUL LAMBS OF REQUESTED TYPE
The purpose of researches is to identify the types of Karakul lambs models of requested type and elaboration of their construction method. The analysis was made of Karakul lambs valuation, results in the sheep herd of National Institute of Zootechnic and Veterinary Medicine (Maximovca, county Anenii Noi). Based on the assessment of the analysis results of the characters manifestation degree have been calculated main genetic parameters of Karakul lambs. Genetic parameters were used to develop credible borders, of characters and attributes for the model of requested type of lamb and calculation of prognostic of selection effect. The following models have been defined for individual's selection in batches and breeding cores: the male model for own breeding; the male model for third breeding (breeding for marketing); * female model for own breeding; ** female model for third breeding (breeding for marketing). For each of these animal models have been set optimal parameters of credible borders (minimum requirements, which are very strict for all models of lambs and, maximum permissible, which relates only to some characters and models) of selection characters and properties. Most stringent requirements were set out in model selection for male lamb of own breeding. The minimum acceptable level limits of characters manifestation and morpho-productive features for lambs selection in this batch are: V1,min ≥ M+1,8 · σ. All lambs of this model had to be hornless. The intensity selection of these individuals model is very high and compiles 3-4%. The second model - female model for own breeding includes minimum and easier requirements, compared with the male model, but quite high, characteristic for best part of plus-variants. Their value is: V2,min ≥ M+0.2 · σ. The third model of lambs is the male for third breeding male, it has the level of characters and features manifestation content within following limits: V3,min ≥ M-0,2 · σ and V3,max < M+1,8 · σ. In this lambs model were included best part of I class muttons (V3,min ≥ M-0,2 · σ) and the remaining part (with exception of V1 mutton) of the upper class (elite). The fourth model of lambs is a female for third breeding, with the level of characters and features manifestation, content within following limits: V4,min = class II and V4,max < M+0,2 · σ. Ewe lambs of this model are included in breeding batch for genitor material's marketing and it's reproduction at third farms. It was proposed to reduce the number of valuation characters by grouping them into 7 synthetic basic characters, after which would be possible to perform the selection.
Key words: model, selection, lamb, Karakul, characters, synthetic