At the 2016 Joint Annual Meeting of the American Society of Animal Science (ASAS), American Dairy Science Association® (ADSA), Western Section of the American Society of Animal Science (WSASAS) and the Canadian Society of Animal Science (CSAS), organizers set the tone with the theme "Animals and Science: Big Solutions for Grand Challenges."
As a science-driven company, Lallemand Animal Nutrition was pleased to once again actively participate in the event ? as a pre-conference sponsor and presenting the Lallemand Animal Nutrition Award for Scientific Excellence in Dairy Nutrition. The recipient was Dr. Michael Steele from the University of Alberta, Canada. Lallemand Animal Nutrition also submitted posters and presentations, which brought new insights to the ruminant feed additive and forage inoculant categories. "The studies presented this year that included solutions from Lallemand Animal Nutrition focused on both innovation and practical applications of existing technologies," says Eric Chevaux, M. Sc., Global Applied R&D Manager, Lallemand Animal Nutrition. "We are pleased to work with leading industry researchers to explore these important areas and help move the global livestock industries forward."
Laurent Dussert, Category Manager for Lallemand Animal Nutrition, commented on this year's event: "At a time when livestock production, as well as human and pet nutrition is at a turning point to move away from antibiotic usage, it is extremely interesting to see that emphasis was put on topics such as microflora management and probiotic solutions. Innovative applications for microbial solutions were highlighted throughout the conference such as: immunity modulation, enhanced feeding behavior, reduced morbidity, pathogen control, as well as anxiety or allergies in pets, or food safety. This is clearly showing us the way forward."
Highlights from the week include the following studies.
Effect of probiotics on the immune response and digestive system development
- Immune response of newly received feedlot steers supplemented with Saccharomyces cerevisiae subspecies boulardii CNCM I-1079 during the receiving period. Schmidt T. et al.
- Saccharomyces cerevisiae boulardii improves acute phase response and phagocytosis during weaning in dairy calves. Fomenky B. et al. Data show that Saccharomyces cerevisiae boulardii has immunomodulatory effects in calves and a possible role in enhancing innate immune and inflammatory responses of calves during the critical stress period of weaning. Direct fed Saccharomyces cerevisiae boulardii might play a role in innate immunity as an early defense system against infections in calves.
- The impact of Saccharomyces cerevisiae and Lactobacillus acidophilus on colon histomorphology and gene expression in rumen and ileum tissues of young dairy calves. Fomenky, B. et al. Data shows that feeding Saccharomyces cerevisiae boulardii altered the colon morphology and increased neutral mucin; an indication of early maturation in the Saccharomyces cerevisiae boulardii treated group. Results suggest that Saccharomyces cerevisiae boulardii could improve colon development in young dairy calves.
Effect of feed additives on the rumen microflora under challenge
- Metabolome and microbiome associations after a grain and sugar challenge. Golder H. M. et al. This study aimed at identifying biomarkers for rumen acidosis and examined the effects of various feed additives including: antibiotics, buffers and monensin-active dry yeast (Saccharomyces cerevisiae CNCM I-1077), on rumen microflora populations and fermentation profiles following an acidosis challenge in heifers. Histamine, valerate and propionate had the strongest association with acidosis, followed by ammonia and butyrate as specific markers of acidosis, pH being only a consequence of the accumulation of lactate and volatile fatty acids. The monensin-active dry yeast treatment showed the greatest diversity in rumen microbiome as compared to the buffers and control, especially after the acidosis challenge. The monensin-active dry yeast-supplemented heifers had lower concentrations of ammonia, butyrate lactate and histamine as compared to the other treatments. It could be concluded that the monensin-active dry yeast treatment had a positive impact on the rumen environment during an acidosis challenge.
Influencing fermentation profiles and digestibility in differnt hybrid varieties, maturities and moisture levels when forages are inoculated
- Bacterial and fungal community structure of conventional and brown midrib corn hybrids ensiled with or without a combo inoculant at high dry matter concentrations. Romero, J. et al. Inoculating 43% dry matter (DM) corn hybrids with Pediococcus pentosaceus 12455 and Lactobacillus buchneri 40788 resulted in silages with higher contents of acetic acid, lower populations of yeasts and molds, and improved aerobic stability compared to untreated ones. It was also shown that inoculated corn silage was dominated by Lactobacillaceae (>98% vs. 50% of untreated silages).
- Bacterial and fungal community structure of oats ensiled with or without a combo inoculant. Romero, J. et al. Final data showed that inoculating oats with Pediococcus pentosaceus 12455 and Lactobacillus buchneri 40788 at the time of ensiling led to significant improvements in aerobic stability and dry matter recovery of the silage. Additionally, it was concluded that inoculation improved silage quality partially by a shift in the microbial community structure during ensiling.
- Microbial count, fermentation, and aerobic stability of regular and brown midrib corn hybrids ensiled with or without a combo inoculant at high moisture concentrations. Romero, J. et al. Researchers concluded that inoculation with Pediococcus pentosaceus 12455 and Lactobacillus buchneri 40788 resulted in consistent enhancements in aerobic stability after 100 days of storage across all corn hybrids. The corn silages had higher concentrations of acetic acid and, subsequently, lower populations of yeasts and molds compared to untreated ones. Thus, showing an improved microbial profile.
Inhibiting growth of food safety-related pathogens in forages
- Inhibiting the growth of Escherichia coli O157:H7 in alfalfa silage with silage additives. Ogunde, I. et al. Researchers noted that alfalfa contaminated with E. coli at ensiling had the pathogen eliminated by the fermentation process (pH drop), which happened faster in haylages treated with Lallemand Animal Nutrition microbial inoculants than by a chemical additive or nothing. After recontamination during feedout, all treated haylages had undetectable counts of E. coli.
- Microbial and chemical additives inhibit the growth of Escherichia coli O157:H7 in corn silage. Ogunde, I. et al. Data showed E. coli that was artificially spiked in corn was eliminated during active phase of ensiling (>7 days of storage) across treatments. Application of a chemical additive or L. buchneri 40788 suppressed the growth of the pathogen that was recontaminated in aerobically exposed corn silage. These silages were also more aerobically stable. Inoculation with homolactic bacteria did not have an effect on E. coli recontamination.