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Effect of microbial inoculation on fermentation profile and aerobic stability of rye silage harvested at different stages of maturity.

I. Eisner




Effect of microbial inoculation on fermentation profile and aerobic stability of rye silage harvested at different stages of maturity.
I. Eisner*1, K. Witt1, V. Vrotniakiene2, J. Jatkauskas2, G. Copani1. 1Chr. Hansen Animal Health and Nutrition H�rsholm, Denmark, 2Institute of Animal Science of Lithuanian University of Health Sciences Baisogala, Lithuania.

The possibility to harvest a rye crop at a boot stage before corn planting may increase the total forage yield per hectare. If the crop is used for biogas production, harvest can take place at other stages of maturity. The objective of this study was to evaluate the effects of a microbial inoculant on fermentation parameters and aerobic stability of rye silage. Rye was harvested at 4 stages of maturity. The crop was ensiled immediately at the flowering; milk; and soft-dough stage. At boot stage, rye was ensiled immediately (BW) or after 24 h of field wilting phase (BD). Five mini-silos (3 l volume) for each treatment were filled with crop (193 kg DM/m3). Control forage (CON), with no inoculant, and experimental treatment (SSFC), inoculated with SiloSolve FC (150,000 total cfu/g of forage), containing 50:50 of Lactobacillus buchneri (DSM22501) and Lactococcus lactis (DSM11037), were stored for 60 d at 20�C. After fermentation, each mini-silo followed an aerobic stability (AS) test by monitoring the temperature increase inside the mini-silos (duration: until they reached +3�C above T ambient, varying from 7 to 30 d depending on crop stage). Data were analyzed in a randomized block design using the GLM procedure (SAS, 9.4) with inoculum as a fixed effect for each maturity stage separately. The use of SSFC significantly enhanced the acetate levels at all maturity stages (P < 0.05). The concentration of butyric acid in SSFC silage was 2.0; 1.4; 0.4; 1.6; 0.7 vs. 9.4; 7.0; 5.6; 11.0; and 6.9 g/kg DM in CON silage for BW, BD, flowering, milk, and soft-dough stage respectively. The observed differences were significant at all stages of maturity (P < 0.01). AS was significantly improved in SSFC silage at all stages of maturity (P < 0.05). The numerically biggest difference in AS was achieved at BD phase (688 vs.120 h for SSFC and CON respectively; P < 0.01). These results demonstrate that SiloSolve FC was beneficial for both fermentation and aerobic stability, providing a flexible solution to direct ensiling of rye from boot till soft-dough maturity stage.

Keywords: aerobic stability, silage inoculant, rye.

Biography: Since September 2018 - Sr. Product Manager Silage Inoculants at Chr. Hansen A/S
January 2010 till August 2018 - Technical Service Manager Ruminants at Kemin Agrifoods Europa
January 2007 till December 2009 - Product Manager Ruminants at Deutsche Tiernahrung Cremer GmbH
June 2006 - PhD at Christian-Albrechts-University of Kiel
January 2005 till December 2006 - Research assistant of the Institute of Animal Nutrition and Physiology on the Christian-Albrechts-University of Kiel