Vliv startérů na užitkové vlastnosti a celkový stav organismu telat

The thesis is focused on the comparison of the influence of different types of starters on feed intake, holstein breed calf increments, feed conversion, economy, rumen fluid and blood parameters during calf rearing. After the colostrum period, the calves were divided into 3 groups of 5 individuals, they were fed by dairy feed mixture and various types of starter mixtures. The first group had ČOT – B granular starter (granulated granulated components), the second group received Premiumstart – muesli and the third group got Goldstart – a mixture of granules, corn flakes and cut straw ("straw starter"). In 60 days old they were bled and then killed in a slaughterhouse. After slaughter, the rumen and rumen fluid were collected from the calves for subsequent analyzes. The average starter consumption and feed conversion was the highest in the second group. The average daily increase was relatively balanced in the individual groups. The load per kg increment and the real starter consumed was demonstrably the lowest in the first group. The average pH of rumen fluid was significantly lower in the first group (below 5.5). Propionic acid was relatively high in all calves (up to 15% in the first group, 9% in the second and third groups) and low levels of acetic acid (8% lower). A low number of ciliates was found in all groups, but in the third group level was close to the reference values of adult cattle (119 thousand / ml). In calves received Goldstart starter straw, rumen fermentation values were closest to the physiological rumen environment. In this group of pH, the number of ciliates and the proportion of acetic acid and propionic acid corresponded. In terms of rumen papillum development, rumen volume, ammonia, pH, WBC, and ALP levels, Premiumstart – muesli is the most appropriate. The WBC concentration was highest in calves that received muesli starter. The highest glucose levels were observed in calves that received the ČOT – B granulator starter. The highest levels of ALP were found in the calves that received the muesli starter, which can be confirmed by the highest daily gains in these calves. The results obtained give a good idea of the functioning of the individual starter mixtures. However, for practice, it will be necessary to repeat the experiment to confirm some claims