Hranidbena i mesna svojstva mladih svinja različitog intenziteta formiranja u ranoj ontogenezi i unutarpasminske diferencijacije prema genu za melanokortin 4 (Mc4r) receptor

The aim of this study was to investigate young pig fattening and meat quality due to the varying formation intensities in early on- togenesis and two genotypes based on the mel- anocortin receptor 4 (Mc4r) gene. To calculate the correlations between traits and the econom- ic efficiency of using animals of experimental groups in industrial complex conditions, the assessment of animals for fattening and meat quality examined the following characteris- tics: average daily live weight gain during the control fattening period in grams; age of reaching 100 kg live weight in days, chilled car- cass length in centimetres; length of the bacon half of the cooled carcass in centimetres; lard thickness at the thoracic vertebrae T6-T7 in millimetres. Further, the biometric processing of research results and calculation of the eco- nomic efficiency was performed. Young pigs of the controlled population met the requirements of the 1st class and the elite class for fattening and meat qualities. In examining the interbreed differentiation of large white breed animals, the melanocortin 4 receptor (Mc4r) gene determined that the Mc4rAG genotype outperformed the Mc4r AA genotype for average daily live weight gain, age at live weight of 100 kg, lard thickness at T6-T7, and chilled carcass length by an average of 4.50%. The difference between groups for the Tyler B's index was 11.82 points, and according to the average daily increase in live weight, the disparity between young pigs of interbreed differentiation according to the formation intensity index was 4.69%, the age of reaching 100 kg live weight was 3.10%, and the chilled carcass length was 1.23%. The num- ber of reliable connections between fattening and meat qualities, and the formation inten- sity and Tyler B indices was 75.0%, indicating their promise for use in selection and breeding work. The maximum increase in additional production was obtained from young pigs of the Mc4r AG genotype (+2.71%) and of group I, in which the formation intensity index ranged from 0.935 to 1.087 points (+2.65%).