Influence of combined conservation additives on grass fermentation and obtained silage quality

English. Aerobic instability is a problem on many farms. Use of biological inoculant can improve silage fermentation, but is not effective in protecting silage exposed to air. Aerobic deterioration generates looses and reduces hygienic quality during the feed-out. A combination of inoculant and chemical treatment has the potential to enhance aerobic stability. The aim of experiment was to evaluate the effect of combined use of biological inoculant and chemical additives Na benzoate and K sorbate on fermentation quality and aerobic stability of red clover/galega silage during the feed out. The application of an additives Na benzoate and K sorbate enhanced content of lactic acid, reduced pH and eliminated butyric acid fermentation in silage. When the silages were open to air, a difference in the pH and mould growth was significant. After 6 days exposure in open air pH level on control variant (untreated silage) increased from 4, 00 to 4, 75, but of silage with inoculant and additives pH level was stable. After 8 days, when silage was open, the untreated silage contained higher count of moulds ( 1x10E-8CFU gE-1 - colony forming units), than silage with inoculant and additives (0 CFU gE-1). The treated silage quality and aerobic stability was not significantly (p is less than 0, 05) different between silage which open in 1, 3, 8 days. Silage with biological inoculant and Na benzoate or K sorbate provides significantly (p is less than 0, 05) increasing of milk yield about 1, 1 kg per day from cow, comparison with not treated silage. It was concluded that the improvements in fermentation and aerobic stability resulted in a higher performance of dairy cows.

Latvian. Pētījuma mērķis bija noteikt ierauga Lacto Fast un piedevu Na benzoāts un K sorbāts iedarbību uz grūti skābstošas zāles masas fermentāciju un iegūtās skābbarības kvalitāti. Izmēģinājums tika veikts ar grūti skābstošu augu masu, kas sastāvēja no Galegas ( Galega orientalis Lam.) 40 % + sarkanā āboliņa ( Trifolium Pratense) 50% + timotiņa (Phleum pratense L.) 10 %. Skābbarība tika gatavota rudenī (2005.g.) ražošanas apstākļos (1. un 3. variants) un no pirmā pļāvuma zāles cerošanas fāzē pavasarī (2006.g.) laboratorijas apstākļos trīs atkārtojumos.