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Aflatoxin M1 in milk depending on season
ROHRBACHEROVÁ, Tereza
The aim of the bachelor thesis was to evaluate the presence of aflatoxin M1 (AFM1) in raw cow's milk, depending on the season. In four terms of 2022, the determination of AFM1 in 172 bulk milk samples from 30 farms was carried out. The Charm MRL AFM1 test kit (Charm), which allows the quantitative determination of AFM1, was used. The highest proportion of samples in which AFM1 was detected was observed in the autumn (18.6 %), and the lowest in the summer (9.4 %). Only two samples had a value above the MRL of the European Union (i.e. 0.05 ug/kg). The average content of AFM1 in milk for the year 2022 was 0.0037 ug/l.
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The analysis of selected parameters on milk quality
ROZHON, Tomáš
The aim of this work was to evaluate the quality of raw cow's milk during the year depending on the breed. In two agricultural companies, respectively in three farms there were monitored total bacteria count (TBC), somatic cell count (SCC), residues of inhibitory substances (RIS), freezing point, protein content and fat content in 2015. Limits of TBC given by European Union (100,000/ml) were kept in all farms. Limits set for SCC (400,000/ml) were exceeded in 25% samples in breeding I and the average value was significantly increased (p <0.001) in comparison to breeding II and III. These results suggest a possible occurrence of subclinical mastitis. For the company it means a significant economic loss. RIS has not been found in any sample. Average protein content of monitored breeding was not too different (3.69; 3.70; 3.67%). Fat content in breeding I (3.84%) was statistically significantly decreased (p <0.001) in comparison to breeding II and III (4.18 4.12%).
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ANALYSIS OF SELECTED INDICATORS OF QUALITY OF RAW COW'S MILK IN AGRICULTURAL ENTERPRISE
HUBENÁ, Šárka
The aim of my thesis was to analyze the quality parameters of raw bulk milk with a focus on hygienic and microbiological quality. For this purpose we choose two markers: somatic cell count (SCC) and total bacterial count (TBC). Data were obtained from two dairy farms Dolní Bukovsko and Popovice for the period from June 2008 to February 2011. For statistical evaluation was used MS Excel and Statistics 6.0. SCC and the average TBC values were recorded at higher density in Dolní Bukovsko. However, the averages for these two breeds are consistent with the legislation of the European Union and the Czech Republic (both TBC (?100,000/ml) and SCC (?400,000/ml)). Even though the average TBC value exceeded the limit of the breeding herd health PSB ? 200 thousand / ml, indicating the possible presence of subclinical mastitis and bonded with the considerable economic losses in milk production.
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Assessment of raw cow milk quality indicators in agricultural enterprise
TIBITANZLOVÁ, Linda
The aim of thesis was to analyze results of raw bulk milk according to these quality indicators: total bacterial count (TBC), somatic cell count (SCC), fat content, protein content, casein content, freezing point, solids-not-fat (SNF) and urea content. Data were evaluated from March 2006 through December 2008 at three farms. All of quality indicators were evaluated in term of farm, year and month. The ANOVA showed a significant effect of farm, year and month on all quality indicators. Limits given by European Union of TBC ({$\leq$}100,000/ml) and SCC ({$\leq$}400,000/ml) were keep in all farms. In first farm were overall means 3.97 % fat, 3.56 % protein, 2.73 % casein percentage, freezing point -0.527 °C, 9.11 % solids-not-fat and 4.8 mmol/l urea. In second farm were overall means 3.89 % fat, 3.47 % protein, 2.68 % casein percentage, freezing point -0.523 °C, 9.01 % solids-not-fat and 3.6 mmol/l urea. In third farm were overall means 3.81 % fat, 3.33 % protein, 2.60 % casein percentage, freezing point -0.522 °C, 8.87 % solids-not-fat and 4.5 mmol/l urea. Results were compared and causes of difference and milk quality variation were explained.
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