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Analysis of selected effects on milk production and fertility in the Czech Pied cattle herd
HORA, Ondřej
The fertility and milk yield are many factors. Generally, these factors can be divided into external and internal. Regarding external factors, including, for example, nutrition, the level of breeding, breeding technology, mobility and the human factor. The most important internal factor is the individual's genetic makeup, heritability and breeding value of parents. The aim was to assess the level of milk production and reproduction of selected Czech Pied cattle herd. The data were evaluated in 3 of lactation in the period 2007-2010. Follow-up was a group of Czech Pied dairy cattle on 190 pieces. File cows were divided according to lactation, the cows at 1, 2 and 3.laktacions. The reference group of cows were subdivided according to the genetic contribution to C1 and C2. The C1 were still separated dairy herd subgroups C100. Furthermore, the observed group of dairy cows as a separate group of fathers. Chosen were 3 bulls whose daughters were in the study group, the highest proportion, the threshold was set at 15 daughters. In the monitored group did not demonstrate the influence of breeding value of the fathers of the fathers upon the subsequent performance of daughters. These results may be distorted by a small number of daughters in the sample. The highest milk production showed a C2 for all lactations. This group had the highest proportion of genetic dairy breeds. This group had the highest performance at the 3rd lactation (6793.13 kg). Has been shown to influence the genetic contribution to individual reproductive performance. The shortest SP was the first lactation group C100 (120.62 days) and the second interim Lactation is also a group C100 (379.58 days). In group C2 with a higher proportion of dairy breeds (A, R), these values were lower (141.29 days and 426.39 days). The observed results of performance tests show that a group of dairy cows of Czech Pied cattle (C100) has, for the period of below average values of milk yield (6188 kg), compared with average values of milk yield of the Czech Spotted breed in the Czech Republic. Also, reproductive performance observed in animals showed below-average performance in comparison with the average of the Czech Spotted breed in the country. The cows were monitored groups revealed a significant difference in fertility problems. It was found that the most common reason for exclusion breeding cows were fertility disorders (71.9%) and other medical reasons (22.1%). The observed density was the mean longevity. C100 group had an average calving 3.07, then 3.58 C2 calving
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