Efekty medziplemenneho krizenia pri ukazovateloch jatocnej hodnoty bykov.
1995
Flak P. | Chrenek J.
The biometric-genetical analyses of live weight, average daily gains, parameters of slaughter and technological value in bulls of the Slovak Spotted breed (S), Black Spotted Lowland breed (N), and their crosses F101 (62.5), F11 (75.0), F111 (87.5) and F1111 (93.75) generations (% proportion of genetic information of N breed) showed the inclination of meat efficiency in crosses towards the N breed. The additivity of studied parameters was tested by the chi** (2) test of good fit between the experimental and expected means mu and linear contrasts. It was found that most of the parameters show an additive form of heredity except for empty body weight (chi** (2)= 11.68** (+)), inner fat (chi** (2)=9.04** (+)), shin from hindquarters (chi** (2)=12.42** (+), significance of contrast with F111 and F1111 generations), neck (chi** (2)=8.96** (+)) and total fat (chi** (2)=10.25** (+)). The estimates of crossing determined by weighted linear regression of four versions of the linear additive-dominant model confirmed that the use of the model for prediction of efficiency in crosses as well as of the influence of non-linear epistatic effects is adequate. Significant negative genetic effects of dressing percentage, inner fat and less valuable parts were found in parameters of the carcass value. The direct genetic effects influenced significantly negatively the parameters of technological dissection: weight of loin, round, low roastbeef, other meat, and total meat. There were signs of heterosis in dressing percentage, fat round and roastbeef. The non-linear epistatic effects of genes demonstrated themselves in fat, shoulder, shins, fore rib and total tallow.
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