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Vyhodnocení reprodukce a mléčné užitkovosti v konvenčním a ekologickém chovu dojnic
Širůčková, Karolína
In this thesis the evaluation of selected reproductive and performance parameters in conventional and organic breeding of Czech fleckvieh cattle was solved. The herd of breeding cows from AZOS, Ltd. Zakřany farm was chosen as the conventional farm and Ekofarma Branná was chosen as the organic farm. The research found, that the age of heifers at their first calving was significantly higher in the organic farm (43 x 26 months). The length of the intercalving period was higher in the conventional farm (387 x 338 days). Much more difficult births occurred in the conventional farm. The type of farming also had a great influence on the milk yield, which was much higher in the conventional farm (32 x 12 kg of milk), as well as higher protein content (3.59 x 3.22 %), lactose content (4.92 x 4.68 %) and non-fatty solids (9.21 x 8.63 %). The organic farm had higher average fat content (4.04 x 3.77 %), fatty acid level (1.05 x 0.59 nmol/100g fat) and somatic cell count (261 x 175 K/ml). In contrary, there was no evidence of an effect of the breeding method on the following parameters: number and sex of calves born, calving ratio of cows and heifers, proportion of multiple births and stillbirths, urea, casein, citric acid, acetone and ketone content.
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