Analysis of milk yield and fertility in the herd of dairy cows of Czech Pied cattle

Current economic conditions emphasize the efficiency of milk production. The two main factors that have an influence on the economics of dairy cattle are the milk yield and the reproduction. Therefore, the effort of breeders of dairy cattle is to achieve a milk production as high as possible while maintaining a good reproductive performance. The aim of the thesis was to evaluate the selected effects to the indicators of fertility and milk production in selected Czech Pied cattle herd. Data were evaluated from June 2008 to October 2013. In the evaluation were included 290 cows that had completed lactation. For the monitored cows was evaluated the effect of lactation on a milk production, the effect of genotype and processing breed on the performance of the and milk components, as well as on selected reproductive indicators . For observed genotypes C1a C2 has been shown that cows of genotype C2 had a statistically significant higher milk yield milk (p < 0.05 ), while the cow with a genotype C1 had significantly higher fat content (p < 0.05). The effect of genotype on age at first calving as well as the influence of the length of the service period, interim and the protein was not statistically significant. An effect of lactation number on the content of the monitored constituents and quantities of milk was statistically significant (p < 0.05), as well as the yield for each lactation. Concurrently was shown an influence of age at first calving to the number of lactation of the monitored breed. In the analyzed dataset was shown the influence of milk production in the length of the service period and the interim. The service period for productive cows with milk yield over 10000 kg of milk per lactation was higher by 17.5 days and the interim by 42.3 days compared with cows yielding 6000 kg of milk per lactation (p < 0.05). It was also shown to influence of a refined breed on milk production and milk components . The crossbreeds of Czech Fleckvieh with the red Holstein breed had the highest average yield per lactation (7885,07 kg of milk) compared to pure-bred cows and the crossbreeds with the breed Ayrshire, which were statistically significantly higher in fat and protein compared with other groups of cows in the monitored breed (p < 0.05). The effect of processing crossing on the length, service period and interim haven´ t been proved in the monitored herd