On the farm Pri Brezarju, Holstein-Friesian fattening bulls are breed, for which the feed ration was calculated never before, and the forage was never analyzed. The home produced forage was now analyzed in the Chemical laboratory at the Department of Animal Science, Biotechnical Faculty, University of Ljubljana. From the cattle register data of the fatteners from years 2012 to 2018 was gathered: the slaughter age of the fatteners and the carcass weight, from which the daily weight gain and slaughter weight of bulls was calculated. The forage analysis showed that poor quality fodder was produced. The first cut hay contained very low quantity of crude protein (CP) (80.2 g/kg of dry matter (DM)) and energy (8.04 MJ of metabolisable energy (ME)/kg DM). The grass silage also did not contain enough CP (130.28 g/kg DM), the content of energy was satisfactory (9.75 MJ ME/kg DM), but silage was not dry enough, as it contained only 308.57 g of DM/kg. Maize silage contained slightly too much DM (463.98 g/kg), but it had enough ME content (10.73 MJ/kg DM). The average slaughter weight of Holstein-Friesian fattening bulls was 675 kg, the average daily weight gain 912 g/day, the average carcass weight 365 kg, the fattening period was in average 688 days. All the results obtained on the farm were better than the Slovenian average for Holstein-Friesian bulls, with the exception of duration of the fattening period. Because of the poor quality of forages,various concentrated feeds in the proposal of new feed ration needed to be added to cover the needs for nutrients. Therefore, in the coming years, a lot of work will have to be done on the quality of the forages, with the proper harvest time and adequate fertilization of the land on which the feed is produced.
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