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Vliv tělesného rámce dojnic na porodní hmotnost telat českého strakatého skotu
Halvová, Lucie
The aim of this work was to analyze the influence of the body frame of dairy Czech fleckvieh cattle on the birth weight of calves. It contains breeding of dairy cattle in the world, production and consumption of milk in the world and in the European Union, description of the breed Czech fleckvieh, linear description and reproduction of cattle. For this purpose were measured and weighted 123 dairy cows and 139 calves. The measurement took place during one calendar year from December 2017 to November 2018 (12 months). These parameters were measured in dairy cows: by using a measuring stick was measured hight at cross (in cm), hip widht (in cm), rump lenght (in cm), body depth (in cm); by using an animeter (tape measure for watching the weight increase in cattle) was measured the body circumference (in cm). In calves were recorded birth weight (in kg), hight at cross (in cm), oblique lenght of the body (in cm), the sex and type of the cattle births (1, 2, 3). It can be stated that a very prominent effect of the body frame of dairy cows on the birth weight of calves was found (p < 0,01). The results show that calves from dairy cows with the largest body frame (146 ≤ cm), respectively with the smallest body frame (≤ 135 cm) had the greatest average birth weight (42.6 kg, respectively 42.8 kg,) and the greatest height in the cross (79.2 cm, respectively 80.6 cm). The significant effect on the birth weight of calves had body weight of dairy cows (p < 0,05). The results show that calves from dairy cows with a weight ≤ 649 kg, respectively with a weight of 951 ≤ kg had an greatest average birth weight (43.8 kg, respectively 43.1 kg). Also there was a significant effect of multiple births on the birth weight of calves, where twin calves had an average birth weight 33.1 kg, while calves from single births had an average birth weight 42.4 kg. The influence of the sex of calves and the influence of the order of lactation on the birth weight of calves were statistically inconclusive.
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