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Analýza mléčné užitkovosti dojnic českého strakatého skotu v průběhu roku ve vybraném chovu
 Čurda, Jaroslav
The aim of this bachelor thesis was the analysis of milk yield in dairy cows of Czech fleckvieh cattle during one calendar year in selected breeding. For this purpose, 12 measurements were made in individual months, where the monitored parameters included day in milk (DIM), number of lactation (n), milk yield (kg milk) and milk components, namely fat (%) and protein (%). The results show that the effect of season had a significant effect on the amount of milk produced (kg) and the milk components (fat, protein). The highest daily milk yield was achieved by dairy cows in spring months and the lowest in autumn and winter months (P < 0.01). The highest fat and protein contents were achieved in autumn and winter months (P < 0.01). The effect of lactation order on milk yield was highly significant. The highest milk yields were achieved in the 3rd lactation. The highest fat, protein and lactose contents were achieved in the 1st lactation (P < 0.01). The effect of lactation stage on milk yield was statistically significant, with the highest milk yields being achieved in the first 100 days of lactation. The lowest was at 301 days or more. The content of milk components (fat, protein) was highest at 301 days and more (P < 0.01).
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4 Čurda, Jakub
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