This thesis deals with the evaluation of selected influences on the milk production and fertility of dairy cows in a herd of Holstein cattle. The cattle husbandry sector, in recent years, has been facing a worsening of the indicators of reproduction and longevity in dairy cows. It is primarily the requirement of constantly increasing the milk yield of dairy cows that has had an adverse impact on these indicators. The worsening of these indicators can result in a reduction of the cost-effectiveness of the production of milk and meat. The evaluation of influences on milk production and fertility in a herd of Holstein cattle was carried out at the AGRODAM Hořepník s.r.o. company. The selected influences included milk yield quantity, parity, age at first calving, calving interval, insemination index, and conception rate after first insemination. Two hundred and two Holstein dairy cows were included in the monitoring. Data on milk yield and reproduction were obtained from milk yield records and zootechnical records. The results showed that milk production of the monitored group of dairy cows was at a high level (10,025 kg of milk). The highest milk yield in kilograms of milk during first lactation was achieved by dairy cows that calved at the age of 27 to 29 months (9,335 kg of milk). According to the milk yield during the first lactation, the highest milk yield during three lactations was by dairy cows that had a milk yield exceeding 10,000 kg of milk during the first lactation (35,515 kg). When utilizing the DOUBLE OVSYNCH synchronization protocol, the average calving interval was 412 days, and a higher conception rate after first insemination (43%) was found as compared to the nationwide average in the Czech Republic (34.2%). The average number of culled dairy cows was 32%; from this the highest proportion of culled dairy cows was for other medical reasons (31%). Due to low milk yields, 25% of the dairy cows were culled.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:173622 |
| Date | January 2014 |
| Creators | FREJLACH, Tomáš |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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