Effect of supplementation of NPN substances on the process of lactic-acid fermentation and nutritive value of corn silage

Abstract

In this study, the impact of adding Benural S (commercial supplement on urea basis, in the amount of 1 and 2%) on the parameters of the chemical composition and quality of corn silage was examined. The experiment was planned according to the model of random plan, with three treatments (CS- CONTROL - control corn silage, CS+1% NPN - corn silage supplemented with 1% Benural-S, CS+2 % NPN - corn silage supplemented with 2 % Benural-S) and three replicates per treatment. Statistical analysis of the results showed a significant increase in the amount of dry matter, crude protein, ammonia and soluble nitrogen, NFE and ash, as well as the pH, when adding Benural S. The most significant changes were in the amount of crude proteins, which was increased by 37.5% when adding 1% S Benural, and 69.8 % when adding 2 % Benural S. Increase of pH and the share of ammonia nitrogen in the treatment with 2 % Benural-S led, according to the method by Weissbach, to diminishing of the quality of silage by one class. When balancing the ration for cows, the significantly increased amount of soluble proteins should be take into account, which are closely correlated with the degree of protein degradation.

U radu je ispitivan uticaj dodavanja Benurala S (komercijalnog dodatka na bazi uree, u količini 1 i 2%) na parametre hemijskog sastava i kvaliteta silaže kukuruza. Eksperiment je planiran po modelu slučajnog plana, sa tri tretmana (CS-CONTROL - kontrolna silaža kukuruza; CS+1% NPN - kukuruzna silaža sa dodatkom 1% Benurala-S; CS+2% NPN - kukuruzna silaža sa dodatkom 2% Benurala-S) i u tri ponavljanja po tretmanu. Statističkom obradom rezultata utvrđeno je signifikantno povećanje količine suve materije, sirovih proteina, amonijačnog i rastvorljivog azota, BEM- a i pepela, kao i pH vrednosti, pri dodavanju Benurala S. Najznačajnije su promene u količini sirovih proteina, koja je povećana za 37,5% pri dodavanju 1% Benurala S, odnosno za 69,8% pri dodavanju 2% Benurala S. Povećanje pH vrednosti i udela amonijačnog azota u tretmanu sa 2% Benurala S dovelo je prema Weissbach-ovoj metodi do smanjenja kvaliteta silaže za jednu klasu. Pri balansiranju obroka za krave treba voditi računa o značajno povećanoj količini rastvorljivih proteina, koji su u uskoj korelaciji sa stepenom razgradivosti proteina.