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Analysis of reproductive indicators in dairy cow breeding
KOCOUR, Daniel
The aim of the diploma thesis was to evaluate the trends in the development of reproductive indicators in specific dairy farming and to define the possible causes of the identified problems and propose measures to eliminate or resolve them. The literature review deals with the physiology of cow fertility, synchronization of estrus, hormonal or nervous control of the sexual cycle, the effect of internal and external influences on the reproduction of dairy cows, the effect of reproduction on milk yield and the economic connections associated with the reproduction of dairy cows. The analysis was carried out in the herd of Czech spotted cattle ZD Lukavec in the district of Pelhřimov. A total of 120 dairy cows that ended lactation between January 1, 2022 and December 31, 2022 were included in the monitoring. There were 40 dairy cows in the 1st lactation, 40 dairy cows in the 2nd lactation, and 40 dairy cows in the 3rd and 3rd lactations. higher lactation. In order to evaluate the effects on reproductive indicators (interval, insemination index, length of service period and intermediate period), the data set was sorted by age at first calving, parity, calving and insemination season, milk yield at laktation peak, length of the previous calving interval, RBV of sire and inseminated bulls, occurrence of mastitis and other diseases. The best reproductive results were found in dairy cows that calved for the first time between 715 and 790 days of ageThe length of the service period was the shortest among primiparous heifers. However, the order of lactation had no significant effect on the insemination index. Cows calved in the summer months (June 21, 2021 to September 23, 2021) clearly had the worst reproduction indicators. The time of year when the 1st insemination was performed, however, did not significantly affect reproductive indicators. The length of the previous interval significantly influenced only the length of the insemination interval. Cows with the lowest daily milk yield at peak lactation had the shortest service period and intermediate period. But they also had the lowest average lactation rank. The influence of the RPH of the father on the fertility of the daughters was evident only for the length of the previous intermediate period, when the daughters of bulls with the highest RPH (?106) had the shortest intermediate period (386 days). However, reproductive indicators were significantly influenced by the RPH of the inseminated bull for its own fertility.
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Posouzení zdravotního stavu dojnic ve vybraném chovu
KOCOUR, Daniel
The aim of the bachelor's thesis was to evaluate the occurrence of individual types of health disorders in the Agricultural Cooperative Lukavec in the period from January 2019 to January 2021. In this period, an average of 760 dairy cows of Czech spotted cattle were monitored. The literature review focuses on the most common diseases of the digestive system, mammary gland, musculoskeletal system, genital system and reproductive disorders. Describes the causes of the disease, their symptoms, diagnosis and methods of treatment. The practical part deals with individual diseases in the breeding, their development, the reasons for the disease, treatment methods and the amount of economic costs. The results showed that the breeding is most affected by mastitis, caused by poor zoohygienic conditions, quality of litter and short adaptation to new feeds. Musculoskeletal disorders were the second most common disease. During the second year, the incidence of dermatitis and necrobacillosis decreased in the second year due to a change in the procedure of hoof bathing, but on the contrary increased the incidence of toe ulcer, white line disease and Rusterholz ulcer due to the construction of a milking parlor and moving dairy cows over unsuitable floors. The third most afflicted disease was genital disease and reproductive disorders.
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