The aim of this thesis was to evaluate the level of mating on the farm using controlled herd reproduction. The evaluation of the level of pregnancy was carried out in dependence on the individual month of observation, the monitored parameters of milk from the performance control of individual lactations and the lines of fathers of cows. Performance data for January 2017 - April 2018 were used for the assessment. Based on the result, it can be concluded that the seasonal percentage is affected by the season. It has been shown that the percentage of pregnancy has decreased in the summer month. The significant decrease in the rate of mating was occurred with the increasing age of cows. The percentage of lactation, regardless of the order of lactation and the line of bulls, is negatively influenced by the milk yield and by the positive effect of the number of lactation days when embedded. To confirm the negative effect of milking yield on the breeding, the NEB breeders showed the highest milk yield and the lowest percentage of pregnancy. Significant fluctuation were occurred in value when evaluating individual indicator depending on the reference month. In the middle of the reporting period, the amount of urea in the milk had a positive effect on pregnancy. A similar result was obtained for the T / B ratio.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:427772 |
| Date | January 2019 |
| Creators | Střecha, Filip |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
Page generated in 0.0023 seconds