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Analysis of dairy milk yields related to changes in livestock breeding environment in ZD Rodvínov
The aim of this diploma thesis was to analyze milk performance in two centers of Cooperative farm Rodvínov (in Zdešov and in Bednárec) and to find out the level of milk performance in different breeding conditions. The analysis was divided into two parts. Analysis No. 1 was comparing two centers of the farm with different breeding environment in 2012-2015. In Zdešov, the cows were reared in cubicle sheds (capacity 500 cows) and were milked twice a day in 2 x 12 herringbone milking parlor. In Bednárec, dairy cows were reared in an older cubicle shed K96 and K64 (capacity 160 cows), on straw bedding., and grazing during the grazing season and milking twice a day in 2 x 6 tandem parlor. In Bednárec, dairy cows achieved better results in the milk performance, in the fatness of milk, production of fat and protein. A statistically significant difference was confirmed in content ( = 0.001; p 0.001) and fat production ( = 0.05; p < 0.05) in a favor of dairy cows in Bednárec. A statistically significant difference was also confirmed in the milk performance of the same breeding groups reared in the different environment. Analysis No. 2 was monitoring the milk performance of dairy cows in Bednárec between years 2015 to 2018, divided in two periods. Period A - without change of breeding environment and period B - with changes in breeding environment and animal welfare. The first change was the movement of the dairy cows to the year-round pasture run. The second change was the commissioning of the new 2 x 12 side by side milking parlor and final movement to a new modern large-capacity stable (capacity 312 cows). There was no significant difference in the average milk performance of dairy cows depending on the change of breeding environment. During the changes, there was a statistically significant extension of the between calving period and the extension of the 1st calving age. Effect of stress caused by the environment and wellfare changes wasn't statistically significant for the level of milk performance of dairy cows. For the level of milk performance was more important the quality level of breeding management, finding cows in heat and insemination during the period of changes.
Analýza mléčné užitkovosti stáda skotu v ZD Rodvínov
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.

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