|
|
Hodnocení kvality mleziva dojnic českého strakatého skotu v ekologickém a konvenčním chovu
Buďová, Tereza
The theoretical part aims to provide information about the mammary gland, colostrum, its composition and quality control, types of milk, milking technologies, parlours, and generally about the importance of cattle breading focusing on Czech spotted cattle breed. The main goal of the practical part was to evaluate and compare the quality of colostrum in eco-breeding and conventional breeding. A total of 266 dairy cows of the Czech spotted cattle were included in the evaluation. Dairy cows were divided into individual lactations in order to evaluate the quality of the colostrum in % Brix, the sex of the born calf and amount of milk in liters per first milking. The obtained results were processed and collected into charts. Our results show that the colostrum quality is better in the eco-breeding in Dalečín than in conventional breeding in Věstín. In Dalečín, 114 dairy cows were evaluated. They reached average Brix values of 20.97 % in the first lactation, 20.42 % in the second, 21 % in the third, 25.15 % in the fourth, 23 % in the fifth and 22.17 % Brix in the last lactation. In total, 57 heifers, 53 bulls and 9 stillborn calves were born there. The average milk yield for individual lactation was 2 liters for the first, 4.1 liters for the second, 4 liters for the third, 4.1 liters for the fourth, 6.2 liters for the fifth and 4.9 liters for the mixed lactation. According to these values, we can state that in the eco-breeding in Dalečín the fourth lactation is the best since it reached 25.15 % Brix. In Věstín, 152 dairy cows were evaluated. In total, 79 heifers, 73 bulls and 8 stillborn calves were born. The average milk yield was 20.22 % for the first lactation, 19.95 % for the second, 21.17 % for the third, 20.63% for the fourth, 21.24 % for the fifth and 21.08 % Brix for the mixed lactation. The average milk yield for individual lactation was 2.47 liters for the first, 4.58 liters for the second, 4.17 liters for the third, 6.6 liters for the fourth, 5.38 liters for the fifth and 5.42 for the mixed lactation. We can state the fifth lactation as the best since it reached 21.24 % Brix.
|
guest ::
