THE INFLUENCE OF OPTIGEN ON GROWTH PERFORMANCE IN BEEF STEERS

Preživači proizvode ureu u slini, min. 500 g/dan, a u buragu se iz uree oslobađa amonijak za sintezu bjelančevina. Otkako je otkriveno da mikroorganizmi buraga mogu koristiti neproteinski dušik (NPN), NPN spojevi se koriste u hranidbi preživača kako bi zamijenili dio biljnih bjelančevina. Cilj ovoga rada bio je utvrditi zajednički učinak NPN spoja s polaganim otpuštanjem (Optigen) i Benural S koji je u pokusnoj skupini dijelom smanjen. Praćeni su sljedeći pokazatelji: tjelesna masa, dnevni prirast, konverzija hrane te cijena utrošene hrane za kg prirasta kod tovne junadi. Pokus je proveden na 55 junadi križanih pasmina u tipu simentalca. Provedena su četiri pojedinačna vaganja, a pokus je trajao 3 mjeseca, odnosno 92 dana. U obroku kontrolne skupine bio je uključen Benural S u količini od 0,12 kg, dok je u pokusnoj skupini udio Benurala S iznosio 0,08 kg, a udio Optigena 0,04 kg. Dobiveni rezultati pokazali su veću prosječnu tjelesnu masu i prirast u pokusnoj skupini bez statistički značajnih razlika između skupina. Konverzija hrane bila je niža u pokusnoj skupini te je iznosila 5,84 kg/kg, a u kontrolnoj 6,96 kg/kg. Cijena utrošene hrane za kg prirasta bila je niža u pokusnoj skupini i iznosila je 8,97 kn u odnosu na kontrolnu skupinu gdje je iznosila 10,71 kn.Ruminants produce urea in saliva, min. 500 g/day, and in the rumen urea releases ammonia for protein synthesis. Ever since it was discovered that the rumen micro organisms can use non-protein nitrogen, NPN compounds have been used in feeding ruminants to replace part of the vegetable protein. The aim of this study was to determine the combined effect of NPN compound with slow release (Optigen) and Benural S which was partly reduced in the experimental group. Monitored were the following indicators, body weight, daily gain, feed conversion and the price of food consumed per kg of weight gain in beef cattle. The experiment was conducted on 55 beef of cattle Simmental breed type. Conducted were four individual weightings, the experiment lasted 3 months i.e. 92 days. The meal of the control group included Benural S in the amount of 0.12 kg, while in the experimental group the proportion of Benural S was 0.08 kg and the proportion of Optigen was 0.04 kg. The results showed a higher average body weight and weight gain in the experimental group, with no statistically significant difference between groups. Feed conversion was lower in the experimental group and amounted to 5.84 kg / kg in the control 6.96 kg / kg. The price of food consumed per kg of weight gain was lower in the experimental group where it was 8.97 kn compared to the control group, where it was 10.71 kn