hrvatski

Utjecaj tipa dodatka na probavljivost škroba različitih hibrida visokovlažnog zrna kukuruza

Lactic acid bacteria (LAB) additives, enzymes and acid additives are added in order to optimize LA content. Enzymatic and acid activity in silage material has an influence on starch protein matrix that defines starch availability. The purpose of the study was to investigate the effect of hybrid and silage additives (LAB and lactic acid) on high moisture corn in vitro starch digestibility (IVSD) after one year of ensilage. Three hybrids of different endosperm texture were grown in 5 replicates in split-plot experimental fields. Silages were ensiled at 68-72 % DM in laboratory silo with one part ensiled with Bio-Sil LAB inoculant (Lactobacillus plantarum ; 300000 CFU/g fresh material), the second was untreated while the third was treated with LA (15 g/kg DM). Samples were taken in green material and after one year of ensiling after which silage IVSD was evaluated. In ensiled material all IVSD parameters showed improvement ; Lag phase was shorter (from 7.37 to 5.43 hours ; P<0.001), rapidly degradation fraction was higher (from 0.28 to 0.54 ; P<0.001) as well as the rate of starch degradation (from 0.051 h-1 to 0.098 h- 1 ; P<0.001) and effective degradability (from 0.53 to 0.78 ; P<0.001). The softer hybrid showed somewhat better IVSD parameters however without significance for degradation rate and lag phase. Inoculant application had a positive effect on IVSD, and LA application showed no effect. In conclusion, hybrid and type of additive used are important however time of ensiling shows a paramount effect on starch digestibility in silages.

silaža ; vrijeme skladištenja ; dodatci ; hibridi ; probavljivost škroba

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