The aim of work – to determine efficienty of the Lithuanian Black-and-White cattle crossing with Charolais bull. The task of research: 1.To analyse the literature about the crossing Lithuanian Black-and-White caws with Charolais bull. 2.To determine the influence of Charolais bull on beef meat production and quality of Lithuanian Black-and-White cattle. Conclusions: 1.Charolais bulls were found to improve the weight of Lithuanian Black-and-White cattle at 18 month of age by 38.5 kg or 7.6 % (P>0,05) and reduced feed conversion per weight gain unit by 8.2 %. 2.The daily gain of the Charolais hybrids bulls was by 8.0 % bigger than that of the pure-blooded Lithuanian Black-and-White bulls. 3.Control slaughters indicated the bigger carcass mass for Charolais hybrids which was 20.7 kg, or 7.8 % bigger than the carcass mass of the pure-blooded Lithuanian Black-and-White young bulls. 4.Hybrids had a 1.5 % better carcass output, 4.0 % better ham output, and 2.4 % better output of ham edible parts in carcass, by 0.65 bigger the coefficient of succulence of this part of carcass and by 42.94 cm² bigger area of loin lean. 5.Crossbreeding had no significant influence on meat quality. A tendency was observed to lower meat pH, higher shear force and a better amino acids triptophan and oxyproline ratio 5.47 of hybrids (P<0,005). 6.It has been concluded that it is useful to use Charolais bulls for crossing with Lithuanian Black-and-White cattle of milk type.

Novelty of the research: 1. Using pure and cross breeding methods competitive genotype of Lithuanian White pig was formed. 2. Method of mixed linear model multivariate analysis was used and heritability of pig productive traits was evaluated in one farm conditions. 3. Genetic evaluation of Lithuanian White breed structure – boars’ lines and sows’ families- was performed as well as their productive traits correlations were determined for the first time in country. 4. For the first time in Lithuanian pig husbandry computerized method for determination of „muscle eye“ area was used. Practical meaning of the work: Using advantages of pure breeding and applying Large White breed „blood infusion“ was created consolidated meat genotype of Lithuanian White pig with high heritability of muscularity, which is used for genetic improvement in other Lithuanian White pig breed farms. At the moment 90 % of best BLUP method evaluated Lithuanian White pig breed boars and sows are kept in UAB „Berka“.