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Využití bazénového vzorku mléka jako ukazatele chovatelského prostředí dojnic holštýnského plemene skotu. =: The analysis of utilizing the bulk milk sample as a demonstration of the stable environment of the Holstein cows /
Velecká, Milena
The subject of the dissertations thesis has been the analysis of utilizing the bulk milk sample as a indicator of the stable environment of cattle of the Holstein. The monitoring was carried out in the Czech Republic in the ŠPZ Žabčice in 55 weeks (between January 2013 and February 2014). Bulk milk samples can be taken as indicators of the quality of the stable environment. We have found out that the average temperature in the stable had a significant influence on the average morning milk yield, on the content of fat, solids non-fat, minerals, active and titration acidities, freezing point of milk (BMM), density, rennet coagulation time, chloride-lactose ratio. The average relative humidity (RH) in the stable conclusively proved the average morning milk yield, content of fat and minerals, active and titration acidity and rennet coagulation time. During the evaluation of the influence of the average THI in a stable on milk composition and milk properties was evaluated as a significant effect on the average morning milk yield, content of fat, minerals, the value of active acidity and titration acidity, freezing point of milk, rennet coagulation time, quality curd and the number of somatic cells counts. The statistically significant effect of the light intensity in the stable was influence on the average morning milk yield and on the value of the titration acidity. When monitoring the influence of the refrigeration value on the composition and properties of milk, we found out its conclusive influence on the average morning milk yield, value of titration acidity and BMM. We have found out that the air velocity in the stable had the conclusive influence on the content of magnesium in the milk. Parameters of stable environment were ranked in terms of their impact on the composition and properties of bulk tank milk samples (from the highest correlation to the lowest): average temperature, average THI, average RH, refrigeration value, light intensity and air velocity. Number of chewing movements can be considered as indicators of quality breeding environments.
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Analysis of dairy milk yields related to changes in livestock breeding environment in ZD Rodvínov
TLACHNOVÁ, Nikola
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.
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