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The Analysis of Selected Impacts on Reproduction of Dairy Cows in a Herd of Holstein Cattle
PROVAZNÍK, Pavel
The diploma thesis deals with the analysis of selected effects on reproduction of Holstein dairy cows. Breeding of cattle faces up to so impaired indicators of reproduction that it could cause the decrease of economic efficiency in production of milk and meat. The aim of the thesis is the evaluation of selected effects that influence the reproduction of dairy cows in the farm in Trhový Štěpánov. Information about reproduction were gained from records of efficiency controls and animal husbandry records of the year 2012. The observation included total 515 Holstein dairy cows (H100) and 1 784 inseminations were carried out. From this amount 350 dairy cows were gravid. Gained data were selected by sequence of lactation, level of dairy efficiency, inseminating bulls and synchronizing programmes. Established results showed that the only reliable indicator was the interval of insemination. Average length of interval of insemination amounted to 79,9 days. The other figures of reproduction indicators were found out below-average comparing the avarage figures of Holstein cattle. Average service period of studied dairy cows was 197,1 days and the length of between-period was 477,1 days. It was found out very low average percentage of gravidity after the first insemination (12,6 %). Average number of doses of insemination for one gravid cow was 3,5. The biggest effect on reproduction indicators had the level of dairy efficiency (P < 0,05). The shortest service period and between-period had dairy cows with efficiency of 7 000 to 10 000 kg of milk. It was not proved the influence of RPH of breeding bulls for gravidity of breeding-cows. The highest percentage of gravidity after all inseminations was after application of EOSTROPHAN (30,5 %). The worst synchronizing programme was DOUBLE OVSYNCH (12 %). The percentage of gravidity after all inseminations and synchronizing programmes was 20,4 % and after spontaneous rut only 15 %.
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Analysis of the causes for discarding dairy Holstein cattle
PROVAZNÍK, Pavel
The bachelor thesis analyses the causes of discarding of dairy cows of Holstein cattle. The aim of the thesis is to evaluate the most common causes, which lead to discarding of dairy cows from breeding in collective farm Trhový Štěpánov a. s. In this thesis were evaluated the results for 294 dairy cows in 2010. The underlying data were obtained from Dairyplan programm on the farm in Trhový Štěpánov, from economic analysis of ZD Trhový Štěpánov a. s. between 2008 and 2010 and from the annual report for each year. In 2010 there were discarded 294 dairy cows from total 864 pieces, that means 34 % of total number. Among causes of discarding of dairy cows belong low productivity, other zootechnical reasons, udder desease, fertility disorders, difficult births and other health reasons. The most dairy cows were discarded for other health reasons. To other health reasons belong liver desease, displacement of abomasum, paratuberculosis and bad condition of limbs. For these reasons it was discarded more than 57 % of dairy cows. The second most common reason was the fertility disorder with less than 16% of dairy cows and the least of dairy cows were discarded for the bad condition of udder and the other zootechnical reasons. Analysed causes of discarding of dairy cows in ZD Trhový Štěpánov a. s. mainly agree with results of control of productivity in the whole Czech Republic.
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