| Popis: |
The research of indicators of the milk production and fertility was conducted in the cooperative farm Rodvínov possessing in total of 198 cows. All cows were bred in the same conditions in years of 2012/2013, 2013/2014 and 2014/2015. The choosing criteria for observed cows were at least second finished lactation. The cows of Czech fleckvieh, their crossbreeds and crossbreeds of Holstein cattle were divided into 7 groups by genotype (C50, C51-74, C75-87, C88-100, H51-74, R51-74, R45-49CM) and into 8 groups by number of lactations. The focus of the research was to discover and confirm the difference of genotype and number of lactation on milk production, milk components, the steadiness of milk production, the service period lenght, insemination interval, the age of first calving and calving interval. Variation were significant ( = 0,001; p < 0,001) between groups of genotype in the milk production, milk components (%) and production of milk components (kg). Differences in reproduction indicators were not significant. From the statistical perspective it is possible to confirm the cows with genotype C50H, H51-74, R51-74 genotype are better in the production of milk, fat and protein. The lowest production had showed cattle from the group of C88-100. Cows with genotype C51-74, C75-87, C88-100, R45-49CM had higher part of milk components than cows with genotype H51-74 and R51-74. First lactation cows had lowest milkproduction, highest production occurred in second lactation.The production of fat and protein was highly different in first lactation. The production of fat and protein was increased by the number of raised lactation. Statistically important difference of milk fattiness were discovered between first and second lactation. The amount of protein was rapidly decreasing till the end of third lactation. |
